I replaced my sender unit a few years ago. Now the
sender seems to be having problems again. Or maybe
just a bad connection because of the infamous GW gas tank area rust!
Fred
85 GW

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:43F1E4AB.EBCA997C@sympatico.ca...
> The charcoal canister or emissions or vapor canister or whatever name
> they want to call it is the gas tank vent. If plugged, it 'will' put a
> vacuum on the gas tank and carb float bowl that imitates running out of
> gas really well.
>
> The air filter on the canister is supposed to be changed every major
> tune up or in my case, every time I finish 'playing' in the mud pits. I
> have had to drive home with a loose gas cap a few times...
>
> The test for it is to crack open the gas cap when it stalls out. If you
> get a whoosh of air and the engine starts back up, you have found your
> trouble.
>
> The in-tank filter is just a sock shaped screen. They 'can' plug up,
> but man you have to have an amazing amount of crud in the tank to do
> that. Blowing back through the gas line can clear a plugged screen or
> blow it off the line. If it is that dirty in there, the tank would need
> flushing.... You also would get plugged up gas filters very often.
>
> Mike
>
> "F. J. Townsend, III" wrote:
>>
>> Thanks, Mike (and others):
>>
>> Can't find a fuel tank vent in the manual. There is a vapor
>> canister filter but I'm not sure that would cause the problem.
>>
>> I changed out the fuel filter and all went well until the other
>> day when I started up and let the GW idle with the defroster on
>> for 30 minutes after a big snowstorm).
>>
>> The engine died during this period and was extremely difficult to
>> restart, even with priming, etc. Now after a restart it runs and
>> starts normally again.
>>
>> I noticed from the shop manual that there is an in-tank filter
>> and I still wonder if there could be a tank problem causing this.
>> I have had a long-standing problem with an inaccurate fuel gauge
>> (not corrected with replacement) and perhaps the two problems are
>> connected.
>>
>> It is such an intermittent symptom it seems very difficult to
>> troubleshoot.
>>
>> Thanks,
>>
>> Frank Townsend
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:43E60F6B.1526C9BE@sympatico.ca...
>> > Either a fuel filter going bad or a plugged up air filter on
>> > the gas
>> > tank vent would be my guesses.
>> >
>> > When was the last time you changed the air filter on the gas
>> > tank vent?
>> > When plugged it makes the vehicle act like it runs out of gas.
>> > Prime it
>> > or let it sit for a while and the vacuum goes away and you are
>> > good to
>> > go for a bit.
>> >
>> > Mike
>> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> > 88 Cherokee 235 BFG AT's
>> > Canadian Off Road Trips Photos: Non members can still view!
>> > Jan/06
>> > http://www.imagestation.com/album/pi...?id=2115147590
>> > (More Off Road album links at bottom of the view page)
>> >
>> > "F. J. Townsend, III" wrote:
>> >>
>> >> Advice from the NG would be most appreciated for the
>> >> following.
>> >>
>> >> 1989 Grand Wagoneer drives and starts well, but on occasion,
>> >> will
>> >> stop as if it were out of gas. Cranking does nothing.
>> >>
>> >> What does work is to pour gas into the carb then restart.
>> >> With
>> >> one or two tries and some pumping the accelerator the Jeep
>> >> will
>> >> then start and run normally until the next time - days or
>> >> weeks
>> >> later.
>> >>
>> >> I suspected problems with fuel tank baffles, but adding gas
>> >> as I
>> >> described shouldn't alleviate that.
>> >>
>> >> Could this be a symptom of a dying fuel pump?
>> >>
>> >> Opinions eagerly solicited!
>> >>
>> >> Thanks,
>> >>
>> >> Frank

 

I replaced my sender unit a few years ago. Now the
sender seems to be having problems again. Or maybe
just a bad connection because of the infamous GW gas tank area rust!
Fred
85 GW

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:43F1E4AB.EBCA997C@sympatico.ca...
> The charcoal canister or emissions or vapor canister or whatever name
> they want to call it is the gas tank vent. If plugged, it 'will' put a
> vacuum on the gas tank and carb float bowl that imitates running out of
> gas really well.
>
> The air filter on the canister is supposed to be changed every major
> tune up or in my case, every time I finish 'playing' in the mud pits. I
> have had to drive home with a loose gas cap a few times...
>
> The test for it is to crack open the gas cap when it stalls out. If you
> get a whoosh of air and the engine starts back up, you have found your
> trouble.
>
> The in-tank filter is just a sock shaped screen. They 'can' plug up,
> but man you have to have an amazing amount of crud in the tank to do
> that. Blowing back through the gas line can clear a plugged screen or
> blow it off the line. If it is that dirty in there, the tank would need
> flushing.... You also would get plugged up gas filters very often.
>
> Mike
>
> "F. J. Townsend, III" wrote:
>>
>> Thanks, Mike (and others):
>>
>> Can't find a fuel tank vent in the manual. There is a vapor
>> canister filter but I'm not sure that would cause the problem.
>>
>> I changed out the fuel filter and all went well until the other
>> day when I started up and let the GW idle with the defroster on
>> for 30 minutes after a big snowstorm).
>>
>> The engine died during this period and was extremely difficult to
>> restart, even with priming, etc. Now after a restart it runs and
>> starts normally again.
>>
>> I noticed from the shop manual that there is an in-tank filter
>> and I still wonder if there could be a tank problem causing this.
>> I have had a long-standing problem with an inaccurate fuel gauge
>> (not corrected with replacement) and perhaps the two problems are
>> connected.
>>
>> It is such an intermittent symptom it seems very difficult to
>> troubleshoot.
>>
>> Thanks,
>>
>> Frank Townsend
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:43E60F6B.1526C9BE@sympatico.ca...
>> > Either a fuel filter going bad or a plugged up air filter on
>> > the gas
>> > tank vent would be my guesses.
>> >
>> > When was the last time you changed the air filter on the gas
>> > tank vent?
>> > When plugged it makes the vehicle act like it runs out of gas.
>> > Prime it
>> > or let it sit for a while and the vacuum goes away and you are
>> > good to
>> > go for a bit.
>> >
>> > Mike
>> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> > 88 Cherokee 235 BFG AT's
>> > Canadian Off Road Trips Photos: Non members can still view!
>> > Jan/06
>> > http://www.imagestation.com/album/pi...?id=2115147590
>> > (More Off Road album links at bottom of the view page)
>> >
>> > "F. J. Townsend, III" wrote:
>> >>
>> >> Advice from the NG would be most appreciated for the
>> >> following.
>> >>
>> >> 1989 Grand Wagoneer drives and starts well, but on occasion,
>> >> will
>> >> stop as if it were out of gas. Cranking does nothing.
>> >>
>> >> What does work is to pour gas into the carb then restart.
>> >> With
>> >> one or two tries and some pumping the accelerator the Jeep
>> >> will
>> >> then start and run normally until the next time - days or
>> >> weeks
>> >> later.
>> >>
>> >> I suspected problems with fuel tank baffles, but adding gas
>> >> as I
>> >> described shouldn't alleviate that.
>> >>
>> >> Could this be a symptom of a dying fuel pump?
>> >>
>> >> Opinions eagerly solicited!
>> >>
>> >> Thanks,
>> >>
>> >> Frank

 

I replaced my sender unit a few years ago. Now the
sender seems to be having problems again. Or maybe
just a bad connection because of the infamous GW gas tank area rust!
Fred
85 GW

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:43F1E4AB.EBCA997C@sympatico.ca...
> The charcoal canister or emissions or vapor canister or whatever name
> they want to call it is the gas tank vent. If plugged, it 'will' put a
> vacuum on the gas tank and carb float bowl that imitates running out of
> gas really well.
>
> The air filter on the canister is supposed to be changed every major
> tune up or in my case, every time I finish 'playing' in the mud pits. I
> have had to drive home with a loose gas cap a few times...
>
> The test for it is to crack open the gas cap when it stalls out. If you
> get a whoosh of air and the engine starts back up, you have found your
> trouble.
>
> The in-tank filter is just a sock shaped screen. They 'can' plug up,
> but man you have to have an amazing amount of crud in the tank to do
> that. Blowing back through the gas line can clear a plugged screen or
> blow it off the line. If it is that dirty in there, the tank would need
> flushing.... You also would get plugged up gas filters very often.
>
> Mike
>
> "F. J. Townsend, III" wrote:
>>
>> Thanks, Mike (and others):
>>
>> Can't find a fuel tank vent in the manual. There is a vapor
>> canister filter but I'm not sure that would cause the problem.
>>
>> I changed out the fuel filter and all went well until the other
>> day when I started up and let the GW idle with the defroster on
>> for 30 minutes after a big snowstorm).
>>
>> The engine died during this period and was extremely difficult to
>> restart, even with priming, etc. Now after a restart it runs and
>> starts normally again.
>>
>> I noticed from the shop manual that there is an in-tank filter
>> and I still wonder if there could be a tank problem causing this.
>> I have had a long-standing problem with an inaccurate fuel gauge
>> (not corrected with replacement) and perhaps the two problems are
>> connected.
>>
>> It is such an intermittent symptom it seems very difficult to
>> troubleshoot.
>>
>> Thanks,
>>
>> Frank Townsend
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:43E60F6B.1526C9BE@sympatico.ca...
>> > Either a fuel filter going bad or a plugged up air filter on
>> > the gas
>> > tank vent would be my guesses.
>> >
>> > When was the last time you changed the air filter on the gas
>> > tank vent?
>> > When plugged it makes the vehicle act like it runs out of gas.
>> > Prime it
>> > or let it sit for a while and the vacuum goes away and you are
>> > good to
>> > go for a bit.
>> >
>> > Mike
>> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> > 88 Cherokee 235 BFG AT's
>> > Canadian Off Road Trips Photos: Non members can still view!
>> > Jan/06
>> > http://www.imagestation.com/album/pi...?id=2115147590
>> > (More Off Road album links at bottom of the view page)
>> >
>> > "F. J. Townsend, III" wrote:
>> >>
>> >> Advice from the NG would be most appreciated for the
>> >> following.
>> >>
>> >> 1989 Grand Wagoneer drives and starts well, but on occasion,
>> >> will
>> >> stop as if it were out of gas. Cranking does nothing.
>> >>
>> >> What does work is to pour gas into the carb then restart.
>> >> With
>> >> one or two tries and some pumping the accelerator the Jeep
>> >> will
>> >> then start and run normally until the next time - days or
>> >> weeks
>> >> later.
>> >>
>> >> I suspected problems with fuel tank baffles, but adding gas
>> >> as I
>> >> described shouldn't alleviate that.
>> >>
>> >> Could this be a symptom of a dying fuel pump?
>> >>
>> >> Opinions eagerly solicited!
>> >>
>> >> Thanks,
>> >>
>> >> Frank

 

Here's an update:

I finally got a replacement vapor canister filter only to
discover when I removed the old one that (1) most of the old
filter was missing and (2) because of the way the canister is
assembled (the plastic base is glued on), the filter is not
really replaceable.

even though the filters are supplied as an extra part, trying to
work the new filter into the place where the old one was
basically destroys the new filter. Besides, since the old filter
was so deteriorated, I assume that the canister is probably no
good anyway.

I ordered a new one from moparpartz.com, and will see if that
seems to be a solution.

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:43F1E4AB.EBCA997C@sympatico.ca...
> The charcoal canister or emissions or vapor canister or
> whatever name
> they want to call it is the gas tank vent. If plugged, it
> 'will' put a
> vacuum on the gas tank and carb float bowl that imitates
> running out of
> gas really well.
>
> The air filter on the canister is supposed to be changed every
> major
> tune up or in my case, every time I finish 'playing' in the mud
> pits. I
> have had to drive home with a loose gas cap a few times...
>
> The test for it is to crack open the gas cap when it stalls
> out. If you
> get a whoosh of air and the engine starts back up, you have
> found your
> trouble.
>
> The in-tank filter is just a sock shaped screen. They 'can'
> plug up,
> but man you have to have an amazing amount of crud in the tank
> to do
> that. Blowing back through the gas line can clear a plugged
> screen or
> blow it off the line. If it is that dirty in there, the tank
> would need
> flushing.... You also would get plugged up gas filters very
> often.
>
> Mike
>
> "F. J. Townsend, III" wrote:
>>
>> Thanks, Mike (and others):
>>
>> Can't find a fuel tank vent in the manual. There is a vapor
>> canister filter but I'm not sure that would cause the problem.
>>
>> I changed out the fuel filter and all went well until the
>> other
>> day when I started up and let the GW idle with the defroster
>> on
>> for 30 minutes after a big snowstorm).
>>
>> The engine died during this period and was extremely difficult
>> to
>> restart, even with priming, etc. Now after a restart it runs
>> and
>> starts normally again.
>>
>> I noticed from the shop manual that there is an in-tank filter
>> and I still wonder if there could be a tank problem causing
>> this.
>> I have had a long-standing problem with an inaccurate fuel
>> gauge
>> (not corrected with replacement) and perhaps the two problems
>> are
>> connected.
>>
>> It is such an intermittent symptom it seems very difficult to
>> troubleshoot.
>>
>> Thanks,
>>
>> Frank Townsend
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:43E60F6B.1526C9BE@sympatico.ca...
>> > Either a fuel filter going bad or a plugged up air filter on
>> > the gas
>> > tank vent would be my guesses.
>> >
>> > When was the last time you changed the air filter on the gas
>> > tank vent?
>> > When plugged it makes the vehicle act like it runs out of
>> > gas.
>> > Prime it
>> > or let it sit for a while and the vacuum goes away and you
>> > are
>> > good to
>> > go for a bit.
>> >
>> > Mike
>> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in
>> > '00
>> > 88 Cherokee 235 BFG AT's
>> > Canadian Off Road Trips Photos: Non members can still view!
>> > Jan/06
>> > http://www.imagestation.com/album/pi...?id=2115147590
>> > (More Off Road album links at bottom of the view page)
>> >
>> > "F. J. Townsend, III" wrote:
>> >>
>> >> Advice from the NG would be most appreciated for the
>> >> following.
>> >>
>> >> 1989 Grand Wagoneer drives and starts well, but on
>> >> occasion,
>> >> will
>> >> stop as if it were out of gas. Cranking does nothing.
>> >>
>> >> What does work is to pour gas into the carb then restart.
>> >> With
>> >> one or two tries and some pumping the accelerator the Jeep
>> >> will
>> >> then start and run normally until the next time - days or
>> >> weeks
>> >> later.
>> >>
>> >> I suspected problems with fuel tank baffles, but adding
>> >> gas
>> >> as I
>> >> described shouldn't alleviate that.
>> >>
>> >> Could this be a symptom of a dying fuel pump?
>> >>
>> >> Opinions eagerly solicited!
>> >>
>> >> Thanks,
>> >>
>> >> Frank

 

Here's an update:

I finally got a replacement vapor canister filter only to
discover when I removed the old one that (1) most of the old
filter was missing and (2) because of the way the canister is
assembled (the plastic base is glued on), the filter is not
really replaceable.

even though the filters are supplied as an extra part, trying to
work the new filter into the place where the old one was
basically destroys the new filter. Besides, since the old filter
was so deteriorated, I assume that the canister is probably no
good anyway.

I ordered a new one from moparpartz.com, and will see if that
seems to be a solution.

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:43F1E4AB.EBCA997C@sympatico.ca...
> The charcoal canister or emissions or vapor canister or
> whatever name
> they want to call it is the gas tank vent. If plugged, it
> 'will' put a
> vacuum on the gas tank and carb float bowl that imitates
> running out of
> gas really well.
>
> The air filter on the canister is supposed to be changed every
> major
> tune up or in my case, every time I finish 'playing' in the mud
> pits. I
> have had to drive home with a loose gas cap a few times...
>
> The test for it is to crack open the gas cap when it stalls
> out. If you
> get a whoosh of air and the engine starts back up, you have
> found your
> trouble.
>
> The in-tank filter is just a sock shaped screen. They 'can'
> plug up,
> but man you have to have an amazing amount of crud in the tank
> to do
> that. Blowing back through the gas line can clear a plugged
> screen or
> blow it off the line. If it is that dirty in there, the tank
> would need
> flushing.... You also would get plugged up gas filters very
> often.
>
> Mike
>
> "F. J. Townsend, III" wrote:
>>
>> Thanks, Mike (and others):
>>
>> Can't find a fuel tank vent in the manual. There is a vapor
>> canister filter but I'm not sure that would cause the problem.
>>
>> I changed out the fuel filter and all went well until the
>> other
>> day when I started up and let the GW idle with the defroster
>> on
>> for 30 minutes after a big snowstorm).
>>
>> The engine died during this period and was extremely difficult
>> to
>> restart, even with priming, etc. Now after a restart it runs
>> and
>> starts normally again.
>>
>> I noticed from the shop manual that there is an in-tank filter
>> and I still wonder if there could be a tank problem causing
>> this.
>> I have had a long-standing problem with an inaccurate fuel
>> gauge
>> (not corrected with replacement) and perhaps the two problems
>> are
>> connected.
>>
>> It is such an intermittent symptom it seems very difficult to
>> troubleshoot.
>>
>> Thanks,
>>
>> Frank Townsend
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:43E60F6B.1526C9BE@sympatico.ca...
>> > Either a fuel filter going bad or a plugged up air filter on
>> > the gas
>> > tank vent would be my guesses.
>> >
>> > When was the last time you changed the air filter on the gas
>> > tank vent?
>> > When plugged it makes the vehicle act like it runs out of
>> > gas.
>> > Prime it
>> > or let it sit for a while and the vacuum goes away and you
>> > are
>> > good to
>> > go for a bit.
>> >
>> > Mike
>> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in
>> > '00
>> > 88 Cherokee 235 BFG AT's
>> > Canadian Off Road Trips Photos: Non members can still view!
>> > Jan/06
>> > http://www.imagestation.com/album/pi...?id=2115147590
>> > (More Off Road album links at bottom of the view page)
>> >
>> > "F. J. Townsend, III" wrote:
>> >>
>> >> Advice from the NG would be most appreciated for the
>> >> following.
>> >>
>> >> 1989 Grand Wagoneer drives and starts well, but on
>> >> occasion,
>> >> will
>> >> stop as if it were out of gas. Cranking does nothing.
>> >>
>> >> What does work is to pour gas into the carb then restart.
>> >> With
>> >> one or two tries and some pumping the accelerator the Jeep
>> >> will
>> >> then start and run normally until the next time - days or
>> >> weeks
>> >> later.
>> >>
>> >> I suspected problems with fuel tank baffles, but adding
>> >> gas
>> >> as I
>> >> described shouldn't alleviate that.
>> >>
>> >> Could this be a symptom of a dying fuel pump?
>> >>
>> >> Opinions eagerly solicited!
>> >>
>> >> Thanks,
>> >>
>> >> Frank

 

Here's an update:

I finally got a replacement vapor canister filter only to
discover when I removed the old one that (1) most of the old
filter was missing and (2) because of the way the canister is
assembled (the plastic base is glued on), the filter is not
really replaceable.

even though the filters are supplied as an extra part, trying to
work the new filter into the place where the old one was
basically destroys the new filter. Besides, since the old filter
was so deteriorated, I assume that the canister is probably no
good anyway.

I ordered a new one from moparpartz.com, and will see if that
seems to be a solution.

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:43F1E4AB.EBCA997C@sympatico.ca...
> The charcoal canister or emissions or vapor canister or
> whatever name
> they want to call it is the gas tank vent. If plugged, it
> 'will' put a
> vacuum on the gas tank and carb float bowl that imitates
> running out of
> gas really well.
>
> The air filter on the canister is supposed to be changed every
> major
> tune up or in my case, every time I finish 'playing' in the mud
> pits. I
> have had to drive home with a loose gas cap a few times...
>
> The test for it is to crack open the gas cap when it stalls
> out. If you
> get a whoosh of air and the engine starts back up, you have
> found your
> trouble.
>
> The in-tank filter is just a sock shaped screen. They 'can'
> plug up,
> but man you have to have an amazing amount of crud in the tank
> to do
> that. Blowing back through the gas line can clear a plugged
> screen or
> blow it off the line. If it is that dirty in there, the tank
> would need
> flushing.... You also would get plugged up gas filters very
> often.
>
> Mike
>
> "F. J. Townsend, III" wrote:
>>
>> Thanks, Mike (and others):
>>
>> Can't find a fuel tank vent in the manual. There is a vapor
>> canister filter but I'm not sure that would cause the problem.
>>
>> I changed out the fuel filter and all went well until the
>> other
>> day when I started up and let the GW idle with the defroster
>> on
>> for 30 minutes after a big snowstorm).
>>
>> The engine died during this period and was extremely difficult
>> to
>> restart, even with priming, etc. Now after a restart it runs
>> and
>> starts normally again.
>>
>> I noticed from the shop manual that there is an in-tank filter
>> and I still wonder if there could be a tank problem causing
>> this.
>> I have had a long-standing problem with an inaccurate fuel
>> gauge
>> (not corrected with replacement) and perhaps the two problems
>> are
>> connected.
>>
>> It is such an intermittent symptom it seems very difficult to
>> troubleshoot.
>>
>> Thanks,
>>
>> Frank Townsend
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:43E60F6B.1526C9BE@sympatico.ca...
>> > Either a fuel filter going bad or a plugged up air filter on
>> > the gas
>> > tank vent would be my guesses.
>> >
>> > When was the last time you changed the air filter on the gas
>> > tank vent?
>> > When plugged it makes the vehicle act like it runs out of
>> > gas.
>> > Prime it
>> > or let it sit for a while and the vacuum goes away and you
>> > are
>> > good to
>> > go for a bit.
>> >
>> > Mike
>> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in
>> > '00
>> > 88 Cherokee 235 BFG AT's
>> > Canadian Off Road Trips Photos: Non members can still view!
>> > Jan/06
>> > http://www.imagestation.com/album/pi...?id=2115147590
>> > (More Off Road album links at bottom of the view page)
>> >
>> > "F. J. Townsend, III" wrote:
>> >>
>> >> Advice from the NG would be most appreciated for the
>> >> following.
>> >>
>> >> 1989 Grand Wagoneer drives and starts well, but on
>> >> occasion,
>> >> will
>> >> stop as if it were out of gas. Cranking does nothing.
>> >>
>> >> What does work is to pour gas into the carb then restart.
>> >> With
>> >> one or two tries and some pumping the accelerator the Jeep
>> >> will
>> >> then start and run normally until the next time - days or
>> >> weeks
>> >> later.
>> >>
>> >> I suspected problems with fuel tank baffles, but adding
>> >> gas
>> >> as I
>> >> described shouldn't alleviate that.
>> >>
>> >> Could this be a symptom of a dying fuel pump?
>> >>
>> >> Opinions eagerly solicited!
>> >>
>> >> Thanks,
>> >>
>> >> Frank