Fuel tank liquid check valve?
 

When I start my Jeep CJ5, I always have to pump the accelerator about 30
times before it begins to get fuel. I was looking through my Haynes manual
today and saw a liquid check valve. It is located in the drivers wheel well
just above the fuel tank. My guess is that it is on the line from the
charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
to the carb.
Is that right?
If so, is there any type of check valve from the sending unit to the fuel
pump, or to the carb. Because it seems like I need one.
Thanks,
Brad
http://www.angelfire.com/ok/beakl/

Re: Fuel tank liquid check valve?
 

That really sounds like you have your gas filter in upside down or you
have a pinhole leak in the gas line on the suction side of the pump.

The gas filter has two outlets. The center outlet goes to the carb and
the 'top' outlet goes to the return line. If the return line isn't at
the top, the gas will syphon back to the tank when it sits causing an
air lock.

A pinhole leak can do the same. The line is a suction line so gas
doesn't drip, but air can still get in when it sits. You need to look
for a small stain on the line, usually near a clamp.

The check valve is indeed on the gas tank vent, so it doesn't affect
flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ghostbuster wrote:
>
> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?
> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.
> Thanks,
> Brad
> http://www.angelfire.com/ok/beakl/

Re: Fuel tank liquid check valve?
 

That really sounds like you have your gas filter in upside down or you
have a pinhole leak in the gas line on the suction side of the pump.

The gas filter has two outlets. The center outlet goes to the carb and
the 'top' outlet goes to the return line. If the return line isn't at
the top, the gas will syphon back to the tank when it sits causing an
air lock.

A pinhole leak can do the same. The line is a suction line so gas
doesn't drip, but air can still get in when it sits. You need to look
for a small stain on the line, usually near a clamp.

The check valve is indeed on the gas tank vent, so it doesn't affect
flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ghostbuster wrote:
>
> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?
> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.
> Thanks,
> Brad
> http://www.angelfire.com/ok/beakl/

Re: Fuel tank liquid check valve?
 

That really sounds like you have your gas filter in upside down or you
have a pinhole leak in the gas line on the suction side of the pump.

The gas filter has two outlets. The center outlet goes to the carb and
the 'top' outlet goes to the return line. If the return line isn't at
the top, the gas will syphon back to the tank when it sits causing an
air lock.

A pinhole leak can do the same. The line is a suction line so gas
doesn't drip, but air can still get in when it sits. You need to look
for a small stain on the line, usually near a clamp.

The check valve is indeed on the gas tank vent, so it doesn't affect
flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ghostbuster wrote:
>
> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?
> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.
> Thanks,
> Brad
> http://www.angelfire.com/ok/beakl/

Re: Fuel tank liquid check valve?
 

That really sounds like you have your gas filter in upside down or you
have a pinhole leak in the gas line on the suction side of the pump.

The gas filter has two outlets. The center outlet goes to the carb and
the 'top' outlet goes to the return line. If the return line isn't at
the top, the gas will syphon back to the tank when it sits causing an
air lock.

A pinhole leak can do the same. The line is a suction line so gas
doesn't drip, but air can still get in when it sits. You need to look
for a small stain on the line, usually near a clamp.

The check valve is indeed on the gas tank vent, so it doesn't affect
flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ghostbuster wrote:
>
> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?
> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.
> Thanks,
> Brad
> http://www.angelfire.com/ok/beakl/

Re: Fuel tank liquid check valve?
 

On Sun, 6 Jun 2004, Ghostbuster wrote:

> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?

That's right. The check valve is there to prevent fuel from backing up
into the bottom-vented charcoal cannister mounted on the firewall if you
over-fill the tank, and then out onto the ground. Depending on the year,
two lines from the top left side of the tank go to the check valve in the
left rear fender well, one line runs forward to the charcoal tank
(mid-seventies Jeeps had different plumbing, four lines from the fuel tank
and more parts).

Pumping the gas pedal 30 times is about 27 wasted moves. If I recall
correctly the accelerator pump is bone dry after three squirts with no
pressure.


> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.

None that I'm aware of. How old is your fuel pump? I haven't looked
forward yet but I'm sure that Mike has mentioned the proper orientation
for the fuel filter (return line to the top, always).

If you are really curious, you could pull the top off the carb float tank
and see if there's fuel sitting there. Before you pull that, you should
also see if the choke is closing when cold.


Be sure to let us know what you find.

Re: Fuel tank liquid check valve?
 

On Sun, 6 Jun 2004, Ghostbuster wrote:

> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?

That's right. The check valve is there to prevent fuel from backing up
into the bottom-vented charcoal cannister mounted on the firewall if you
over-fill the tank, and then out onto the ground. Depending on the year,
two lines from the top left side of the tank go to the check valve in the
left rear fender well, one line runs forward to the charcoal tank
(mid-seventies Jeeps had different plumbing, four lines from the fuel tank
and more parts).

Pumping the gas pedal 30 times is about 27 wasted moves. If I recall
correctly the accelerator pump is bone dry after three squirts with no
pressure.


> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.

None that I'm aware of. How old is your fuel pump? I haven't looked
forward yet but I'm sure that Mike has mentioned the proper orientation
for the fuel filter (return line to the top, always).

If you are really curious, you could pull the top off the carb float tank
and see if there's fuel sitting there. Before you pull that, you should
also see if the choke is closing when cold.


Be sure to let us know what you find.

Re: Fuel tank liquid check valve?
 

On Sun, 6 Jun 2004, Ghostbuster wrote:

> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?

That's right. The check valve is there to prevent fuel from backing up
into the bottom-vented charcoal cannister mounted on the firewall if you
over-fill the tank, and then out onto the ground. Depending on the year,
two lines from the top left side of the tank go to the check valve in the
left rear fender well, one line runs forward to the charcoal tank
(mid-seventies Jeeps had different plumbing, four lines from the fuel tank
and more parts).

Pumping the gas pedal 30 times is about 27 wasted moves. If I recall
correctly the accelerator pump is bone dry after three squirts with no
pressure.


> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.

None that I'm aware of. How old is your fuel pump? I haven't looked
forward yet but I'm sure that Mike has mentioned the proper orientation
for the fuel filter (return line to the top, always).

If you are really curious, you could pull the top off the carb float tank
and see if there's fuel sitting there. Before you pull that, you should
also see if the choke is closing when cold.


Be sure to let us know what you find.

Re: Fuel tank liquid check valve?
 

On Sun, 6 Jun 2004, Ghostbuster wrote:

> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?

That's right. The check valve is there to prevent fuel from backing up
into the bottom-vented charcoal cannister mounted on the firewall if you
over-fill the tank, and then out onto the ground. Depending on the year,
two lines from the top left side of the tank go to the check valve in the
left rear fender well, one line runs forward to the charcoal tank
(mid-seventies Jeeps had different plumbing, four lines from the fuel tank
and more parts).

Pumping the gas pedal 30 times is about 27 wasted moves. If I recall
correctly the accelerator pump is bone dry after three squirts with no
pressure.


> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.

None that I'm aware of. How old is your fuel pump? I haven't looked
forward yet but I'm sure that Mike has mentioned the proper orientation
for the fuel filter (return line to the top, always).

If you are really curious, you could pull the top off the carb float tank
and see if there's fuel sitting there. Before you pull that, you should
also see if the choke is closing when cold.


Be sure to let us know what you find.

Re: Fuel tank liquid check valve?
 

You need an accelerator pump #41 that come in a twenty dollar
rebuild kit: http://www.carburetorfactory.com/expvw03.html
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ghostbuster wrote:
>
> When I start my Jeep CJ5, I always have to pump the accelerator about 30
> times before it begins to get fuel. I was looking through my Haynes manual
> today and saw a liquid check valve. It is located in the drivers wheel well
> just above the fuel tank. My guess is that it is on the line from the
> charcoal cannister back to the tank. So it shouldnt affect my lack of fuel
> to the carb.
> Is that right?
> If so, is there any type of check valve from the sending unit to the fuel
> pump, or to the carb. Because it seems like I need one.
> Thanks,
> Brad
> http://www.angelfire.com/ok/beakl/