Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

snip: (Once you are below 3/4 of a tank the fuel pump is sitting in the
air.
It has a pickup tube to reach into the gas.)

Not on any Cherokee I've ever worked on, unless it was carbureted. I've done
a couple dozen or so over the years.

That comes directly from a mechanic friend of mine who is a Chrysler/Jeep
mechanic of over 20 years.
He ascertains that Chrysler recommends not letting the fuel in the tank drop
below the 1/4 mark, due to submersion being the only way it's cooled.
I've personally been told that too, when purchasing new fuel pumps, not just
for Jeeps, but GM products as well.

Plus, the spare pump I have in my workshop for my step daughters XJ has a
1-1/4in suction neck on it that fits directly into the sock/screen/filter.
The pump resides at the bottom of the tank in the sump of the fuel tank.
The return line does not circulate back through the pump, but empties back
into the tank unimpeded.

I agree, a bad regulator can cause premature pump failure as well. I was
only suggesting one possible cause.

Spdloader

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:455C88DD.14AE0588@sympatico.ca...
> Say what????
>
> >
> The cooling jacket around the pump is fed by the fuel return line that
> comes back from the engine.
>
> The only way to burn out a pump from heat is to block the fuel return
> line.
>
> I would suspect the OP has a bad regulator, not a bad pump.
>
> 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)
>
> Spdloader wrote:
>>
>> Do you regularly run your tank low? The fuel pump is cooled by fuel in
>> the
>> tank.
>> Constantly running the tank low creates some heat in the pump, shortening
>> it's lifespan over time.
>>
>> Spdloader
>>
>> "MJG" <jodimark@removethis1.bellsouth.net> wrote in message
>> news:%uR6h.244$PS2.138@bignews8.bellsouth.net...
>> > Purchased vehicle new, have been meticulous w/maintenance. I am about
>> > to
>> > take on fuel pump #5. Anyone else getting only 50k / fuel pump?
>> > Averages
>> > out to a new pump every 2 years.
>> >
>> > Mechanic says pressure is all over the map.
>> >
>> > First one was under warranty, after the fuel sending gauge issue... the
>> > rest have been customer pay warranty.
>> >

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

snip: (Once you are below 3/4 of a tank the fuel pump is sitting in the
air.
It has a pickup tube to reach into the gas.)

Not on any Cherokee I've ever worked on, unless it was carbureted. I've done
a couple dozen or so over the years.

That comes directly from a mechanic friend of mine who is a Chrysler/Jeep
mechanic of over 20 years.
He ascertains that Chrysler recommends not letting the fuel in the tank drop
below the 1/4 mark, due to submersion being the only way it's cooled.
I've personally been told that too, when purchasing new fuel pumps, not just
for Jeeps, but GM products as well.

Plus, the spare pump I have in my workshop for my step daughters XJ has a
1-1/4in suction neck on it that fits directly into the sock/screen/filter.
The pump resides at the bottom of the tank in the sump of the fuel tank.
The return line does not circulate back through the pump, but empties back
into the tank unimpeded.

I agree, a bad regulator can cause premature pump failure as well. I was
only suggesting one possible cause.

Spdloader

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:455C88DD.14AE0588@sympatico.ca...
> Say what????
>
> >
> The cooling jacket around the pump is fed by the fuel return line that
> comes back from the engine.
>
> The only way to burn out a pump from heat is to block the fuel return
> line.
>
> I would suspect the OP has a bad regulator, not a bad pump.
>
> 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)
>
> Spdloader wrote:
>>
>> Do you regularly run your tank low? The fuel pump is cooled by fuel in
>> the
>> tank.
>> Constantly running the tank low creates some heat in the pump, shortening
>> it's lifespan over time.
>>
>> Spdloader
>>
>> "MJG" <jodimark@removethis1.bellsouth.net> wrote in message
>> news:%uR6h.244$PS2.138@bignews8.bellsouth.net...
>> > Purchased vehicle new, have been meticulous w/maintenance. I am about
>> > to
>> > take on fuel pump #5. Anyone else getting only 50k / fuel pump?
>> > Averages
>> > out to a new pump every 2 years.
>> >
>> > Mechanic says pressure is all over the map.
>> >
>> > First one was under warranty, after the fuel sending gauge issue... the
>> > rest have been customer pay warranty.
>> >

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

snip: (Once you are below 3/4 of a tank the fuel pump is sitting in the
air.
It has a pickup tube to reach into the gas.)

Not on any Cherokee I've ever worked on, unless it was carbureted. I've done
a couple dozen or so over the years.

That comes directly from a mechanic friend of mine who is a Chrysler/Jeep
mechanic of over 20 years.
He ascertains that Chrysler recommends not letting the fuel in the tank drop
below the 1/4 mark, due to submersion being the only way it's cooled.
I've personally been told that too, when purchasing new fuel pumps, not just
for Jeeps, but GM products as well.

Plus, the spare pump I have in my workshop for my step daughters XJ has a
1-1/4in suction neck on it that fits directly into the sock/screen/filter.
The pump resides at the bottom of the tank in the sump of the fuel tank.
The return line does not circulate back through the pump, but empties back
into the tank unimpeded.

I agree, a bad regulator can cause premature pump failure as well. I was
only suggesting one possible cause.

Spdloader

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:455C88DD.14AE0588@sympatico.ca...
> Say what????
>
> >
> The cooling jacket around the pump is fed by the fuel return line that
> comes back from the engine.
>
> The only way to burn out a pump from heat is to block the fuel return
> line.
>
> I would suspect the OP has a bad regulator, not a bad pump.
>
> 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)
>
> Spdloader wrote:
>>
>> Do you regularly run your tank low? The fuel pump is cooled by fuel in
>> the
>> tank.
>> Constantly running the tank low creates some heat in the pump, shortening
>> it's lifespan over time.
>>
>> Spdloader
>>
>> "MJG" <jodimark@removethis1.bellsouth.net> wrote in message
>> news:%uR6h.244$PS2.138@bignews8.bellsouth.net...
>> > Purchased vehicle new, have been meticulous w/maintenance. I am about
>> > to
>> > take on fuel pump #5. Anyone else getting only 50k / fuel pump?
>> > Averages
>> > out to a new pump every 2 years.
>> >
>> > Mechanic says pressure is all over the map.
>> >
>> > First one was under warranty, after the fuel sending gauge issue... the
>> > rest have been customer pay warranty.
>> >

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

You are correct, I should have looked in the book, the last few I have
had to mess with are Chrysler ones that sit up top, not Jeep ones that
sit in the sump.

Even so, that sump they fit into is 'supposed' to be filled full via the
return line. It isn't supposed to be splash filled or to need a full
tank of gas.

If the dying pump is a heat related problem, then I think I would look
at the regulator that controls the return line pressure.

Mike

Spdloader wrote:
>
> snip: (Once you are below 3/4 of a tank the fuel pump is sitting in the
> air.
> It has a pickup tube to reach into the gas.)
>
> Not on any Cherokee I've ever worked on, unless it was carbureted. I've done
> a couple dozen or so over the years.
>
> That comes directly from a mechanic friend of mine who is a Chrysler/Jeep
> mechanic of over 20 years.
> He ascertains that Chrysler recommends not letting the fuel in the tank drop
> below the 1/4 mark, due to submersion being the only way it's cooled.
> I've personally been told that too, when purchasing new fuel pumps, not just
> for Jeeps, but GM products as well.
>
> Plus, the spare pump I have in my workshop for my step daughters XJ has a
> 1-1/4in suction neck on it that fits directly into the sock/screen/filter.
> The pump resides at the bottom of the tank in the sump of the fuel tank.
> The return line does not circulate back through the pump, but empties back
> into the tank unimpeded.
>
> I agree, a bad regulator can cause premature pump failure as well. I was
> only suggesting one possible cause.
>
> Spdloader
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:455C88DD.14AE0588@sympatico.ca...
> > Say what????
> >
> > >
> > The cooling jacket around the pump is fed by the fuel return line that
> > comes back from the engine.
> >
> > The only way to burn out a pump from heat is to block the fuel return
> > line.
> >
> > I would suspect the OP has a bad regulator, not a bad pump.
> >
> > 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)
> >
> > Spdloader wrote:
> >>
> >> Do you regularly run your tank low? The fuel pump is cooled by fuel in
> >> the
> >> tank.
> >> Constantly running the tank low creates some heat in the pump, shortening
> >> it's lifespan over time.
> >>
> >> Spdloader
> >>
> >> "MJG" <jodimark@removethis1.bellsouth.net> wrote in message
> >> news:%uR6h.244$PS2.138@bignews8.bellsouth.net...
> >> > Purchased vehicle new, have been meticulous w/maintenance. I am about
> >> > to
> >> > take on fuel pump #5. Anyone else getting only 50k / fuel pump?
> >> > Averages
> >> > out to a new pump every 2 years.
> >> >
> >> > Mechanic says pressure is all over the map.
> >> >
> >> > First one was under warranty, after the fuel sending gauge issue... the
> >> > rest have been customer pay warranty.
> >> >

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

You are correct, I should have looked in the book, the last few I have
had to mess with are Chrysler ones that sit up top, not Jeep ones that
sit in the sump.

Even so, that sump they fit into is 'supposed' to be filled full via the
return line. It isn't supposed to be splash filled or to need a full
tank of gas.

If the dying pump is a heat related problem, then I think I would look
at the regulator that controls the return line pressure.

Mike

Spdloader wrote:
>
> snip: (Once you are below 3/4 of a tank the fuel pump is sitting in the
> air.
> It has a pickup tube to reach into the gas.)
>
> Not on any Cherokee I've ever worked on, unless it was carbureted. I've done
> a couple dozen or so over the years.
>
> That comes directly from a mechanic friend of mine who is a Chrysler/Jeep
> mechanic of over 20 years.
> He ascertains that Chrysler recommends not letting the fuel in the tank drop
> below the 1/4 mark, due to submersion being the only way it's cooled.
> I've personally been told that too, when purchasing new fuel pumps, not just
> for Jeeps, but GM products as well.
>
> Plus, the spare pump I have in my workshop for my step daughters XJ has a
> 1-1/4in suction neck on it that fits directly into the sock/screen/filter.
> The pump resides at the bottom of the tank in the sump of the fuel tank.
> The return line does not circulate back through the pump, but empties back
> into the tank unimpeded.
>
> I agree, a bad regulator can cause premature pump failure as well. I was
> only suggesting one possible cause.
>
> Spdloader
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:455C88DD.14AE0588@sympatico.ca...
> > Say what????
> >
> > >
> > The cooling jacket around the pump is fed by the fuel return line that
> > comes back from the engine.
> >
> > The only way to burn out a pump from heat is to block the fuel return
> > line.
> >
> > I would suspect the OP has a bad regulator, not a bad pump.
> >
> > 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)
> >
> > Spdloader wrote:
> >>
> >> Do you regularly run your tank low? The fuel pump is cooled by fuel in
> >> the
> >> tank.
> >> Constantly running the tank low creates some heat in the pump, shortening
> >> it's lifespan over time.
> >>
> >> Spdloader
> >>
> >> "MJG" <jodimark@removethis1.bellsouth.net> wrote in message
> >> news:%uR6h.244$PS2.138@bignews8.bellsouth.net...
> >> > Purchased vehicle new, have been meticulous w/maintenance. I am about
> >> > to
> >> > take on fuel pump #5. Anyone else getting only 50k / fuel pump?
> >> > Averages
> >> > out to a new pump every 2 years.
> >> >
> >> > Mechanic says pressure is all over the map.
> >> >
> >> > First one was under warranty, after the fuel sending gauge issue... the
> >> > rest have been customer pay warranty.
> >> >

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

You are correct, I should have looked in the book, the last few I have
had to mess with are Chrysler ones that sit up top, not Jeep ones that
sit in the sump.

Even so, that sump they fit into is 'supposed' to be filled full via the
return line. It isn't supposed to be splash filled or to need a full
tank of gas.

If the dying pump is a heat related problem, then I think I would look
at the regulator that controls the return line pressure.

Mike

Spdloader wrote:
>
> snip: (Once you are below 3/4 of a tank the fuel pump is sitting in the
> air.
> It has a pickup tube to reach into the gas.)
>
> Not on any Cherokee I've ever worked on, unless it was carbureted. I've done
> a couple dozen or so over the years.
>
> That comes directly from a mechanic friend of mine who is a Chrysler/Jeep
> mechanic of over 20 years.
> He ascertains that Chrysler recommends not letting the fuel in the tank drop
> below the 1/4 mark, due to submersion being the only way it's cooled.
> I've personally been told that too, when purchasing new fuel pumps, not just
> for Jeeps, but GM products as well.
>
> Plus, the spare pump I have in my workshop for my step daughters XJ has a
> 1-1/4in suction neck on it that fits directly into the sock/screen/filter.
> The pump resides at the bottom of the tank in the sump of the fuel tank.
> The return line does not circulate back through the pump, but empties back
> into the tank unimpeded.
>
> I agree, a bad regulator can cause premature pump failure as well. I was
> only suggesting one possible cause.
>
> Spdloader
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:455C88DD.14AE0588@sympatico.ca...
> > Say what????
> >
> > >
> > The cooling jacket around the pump is fed by the fuel return line that
> > comes back from the engine.
> >
> > The only way to burn out a pump from heat is to block the fuel return
> > line.
> >
> > I would suspect the OP has a bad regulator, not a bad pump.
> >
> > 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)
> >
> > Spdloader wrote:
> >>
> >> Do you regularly run your tank low? The fuel pump is cooled by fuel in
> >> the
> >> tank.
> >> Constantly running the tank low creates some heat in the pump, shortening
> >> it's lifespan over time.
> >>
> >> Spdloader
> >>
> >> "MJG" <jodimark@removethis1.bellsouth.net> wrote in message
> >> news:%uR6h.244$PS2.138@bignews8.bellsouth.net...
> >> > Purchased vehicle new, have been meticulous w/maintenance. I am about
> >> > to
> >> > take on fuel pump #5. Anyone else getting only 50k / fuel pump?
> >> > Averages
> >> > out to a new pump every 2 years.
> >> >
> >> > Mechanic says pressure is all over the map.
> >> >
> >> > First one was under warranty, after the fuel sending gauge issue... the
> >> > rest have been customer pay warranty.
> >> >

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

MJG wrote:

> Purchased vehicle new, have been meticulous w/maintenance. I am about to
> take on fuel pump #5. Anyone else getting only 50k / fuel pump? Averages
> out to a new pump every 2 years.
>
> Mechanic says pressure is all over the map.

Fords are famous for this for some reason. I'd change out the pressure
regulator as well this time around. And only use OEM parts. Most
aftermarket stuff is junk, this item included.

Be sure fuel filters are changed regularly as well, if equippped. I've
heard that frequently running less than 1/4 tank of fuel can cause
overheating, though most newer designs have overcome this problem.

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

MJG wrote:

> Purchased vehicle new, have been meticulous w/maintenance. I am about to
> take on fuel pump #5. Anyone else getting only 50k / fuel pump? Averages
> out to a new pump every 2 years.
>
> Mechanic says pressure is all over the map.

Fords are famous for this for some reason. I'd change out the pressure
regulator as well this time around. And only use OEM parts. Most
aftermarket stuff is junk, this item included.

Be sure fuel filters are changed regularly as well, if equippped. I've
heard that frequently running less than 1/4 tank of fuel can cause
overheating, though most newer designs have overcome this problem.

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

MJG wrote:

> Purchased vehicle new, have been meticulous w/maintenance. I am about to
> take on fuel pump #5. Anyone else getting only 50k / fuel pump? Averages
> out to a new pump every 2 years.
>
> Mechanic says pressure is all over the map.

Fords are famous for this for some reason. I'd change out the pressure
regulator as well this time around. And only use OEM parts. Most
aftermarket stuff is junk, this item included.

Be sure fuel filters are changed regularly as well, if equippped. I've
heard that frequently running less than 1/4 tank of fuel can cause
overheating, though most newer designs have overcome this problem.

Re: 97 cherokee 4L - Fuel pump #5 in 250k
 

Hi Mike,
How offend are you below a quarter tank? Everyone of my passenger
cars has at least five gallons in when the gauge reads empty. I cooked a
brand new Stewart Warner external push pump, just running out once and
trying to make another mile for a gas station.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Mike Romain wrote:
>
> Say what????
>
> Once you are below 3/4 of a tank the fuel pump is sitting in the air.
> It has a pickup tube to reach into the gas.
>
> The cooling jacket around the pump is fed by the fuel return line that
> comes back from the engine.
>
> The only way to burn out a pump from heat is to block the fuel return
> line.
>
> I would suspect the OP has a bad regulator, not a bad pump.
>
> 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)