The Ford Barn

dgkipp · 05-31-2015, 11:20 AM

Hi guys, this has been driving me crazy for months. After 20 mins. Driving I have no fuel pressure. Installed 3 carb manifold with 97s. Installed a carter elec fuel pump in the rear at the tank with filter at the suction side. Preset the fuel pressure at 2 1/2 pounds. Runs great for 20 mins then fuel pressure starts dropping to 0. Installed a return fuel line to fuel tank from fuel block.no better.
Checked carb temp when pressures sure is 0 and it is only 97 degrees. Engine temp 160 degrees. This is the second carter pump. Tried it with the fuel cap off .still drops to 0. Any one have any ideas. Thanks..

Binx · 05-31-2015, 11:30 AM

Maybe check the supplied voltage and amp draw at the pump during start-up then again after 20 min.

Lonnie

uncle max · 05-31-2015, 11:52 AM

Quote:

Originally Posted by dgkipp

Hi guys, this has been driving me crazy for months. After 20 mins. Driving I have no fuel pressure. Installed 3 carb manifold with 97s. Installed a carter elec fuel pump in the rear at the tank with filter at the suction side. Preset the fuel pressure at 2 1/2 pounds. Runs great for 20 mins then fuel pressure starts dropping to 0. Installed a return fuel line to fuel tank from fuel block.no better.
Checked carb temp when pressures sure is 0 and it is only 97 degrees. Engine temp 160 degrees. This is the second carter pump. Tried it with the fuel cap off .still drops to 0. Any one have any ideas. Thanks..

If it's one of those dial regulators sold by auto parts stores, junk it and get a decent regulator.

Ken/Alabama · 05-31-2015, 12:32 PM

Is the gas cap vented?

Lawson Cox · 05-31-2015, 12:51 PM

Hook up a mechanical gauge and see what the pressure is.

f1builder · 05-31-2015, 12:58 PM

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with 3 carbs you might want to move it up to 3 or 3 1/2 and try that for a while. i run 2 97's and 2 1/2 is a little less than it wants, especially in 2d to 3rd gear at around 60, it stumbled a bit at 2 1/2 and the pressure dropped off to almost 0. also tuned the idle adjustment on the front carb so it is opened up about 3 turns instead of 1 1/2 or 2. just tinker with it till it gets where you want it.

19Fordy · 05-31-2015, 01:27 PM

Right after the 20 minutes when it stops running, disconnect the fuel line at the carburetor and see if the fuel pump is pumping fuel. If your fuel pressure gauge is one of those after market 'liquid filled" gauges, drain the liquid out of it and it will probably show a reading.
That's what I did to my liquid filled gauge. Even though it read "zero" it was really pumping fuel. Don't know what regulator you're using, but i found the little Holley regulators to work good.

dgkipp · 05-31-2015, 01:29 PM

Used two new holley regulators

dgkipp · 05-31-2015, 01:31 PM

Hooked up 2 new liquid gauges. Both the same results

sidevalve8ba · 05-31-2015, 01:31 PM

When the fuel pressure drops to 0 does the engine die out from lack of fuel?

dgkipp · 05-31-2015, 01:32 PM

Gas cap is vented. Even tried it with no gas cap.

dgkipp · 05-31-2015, 01:33 PM

Yes starts stumbling.

36 flathead · 05-31-2015, 01:43 PM

sounds like garbage in the fuel tank.

Joe Immler · 05-31-2015, 02:04 PM

I agree with 36 flathead. I had a same situation. Found there was a piece of masking tape that floated around in the tank and it was eventually attracted to the fuel line and stalled the engine out. Of course, after stopping it started floating around again. Oh yeah, how the tape got there is a complete mystery ! You should be able to remove the gas gauge unit on the top of the tank and look around with a bright flash light. I could see nearly every part of the bottom of the tank. Let us know the answer to your problem.

Lanny · 05-31-2015, 02:36 PM

If the tank isn't new, or if it's original, and hasn't been professionally cleaned' then
I would change the fuel filter fairly often.

.

19Fordy · 05-31-2015, 03:17 PM

Quote:

Originally Posted by dgkipp

Hooked up 2 new liquid gauges. Both the same results

Drain the liquid from those gauges and try again to see if you still get a zero reading.

30-9 · 05-31-2015, 03:38 PM

He said car stumbles - I doubt gauges have anything to do with it

Tony, NY · 05-31-2015, 03:56 PM

Quote:

Originally Posted by Binx

Maybe check the supplied voltage and amp draw at the pump during start-up then again after 20 min.

Lonnie

I agree. If you have an wire connection hanging on by a few strands it will quit after a while.

George/Maine · 05-31-2015, 04:42 PM

I would move the filter to inlet at fuel block. Then blow back fuel line with 40 lbs. air. to tank.

sidevalve8ba · 05-31-2015, 05:19 PM

Quote:

Originally Posted by 30-9

He said car stumbles - I doubt gauges have anything to do with it

Yep, I gotta wonder about that, too.

05-31-2015, 11:20 AM	#1
dgkipp Member Join Date: Dec 2011 Posts: 64	No fuel pressure after 20 mins driving Hi guys, this has been driving me crazy for months. After 20 mins. Driving I have no fuel pressure. Installed 3 carb manifold with 97s. Installed a carter elec fuel pump in the rear at the tank with filter at the suction side. Preset the fuel pressure at 2 1/2 pounds. Runs great for 20 mins then fuel pressure starts dropping to 0. Installed a return fuel line to fuel tank from fuel block.no better. Checked carb temp when pressures sure is 0 and it is only 97 degrees. Engine temp 160 degrees. This is the second carter pump. Tried it with the fuel cap off .still drops to 0. Any one have any ideas. Thanks..

05-31-2015, 11:30 AM	#2
Binx Senior Member Join Date: Oct 2011 Location: Gloucester VA Posts: 1,042	Re: No fuel pressure after 20 mins driving Maybe check the supplied voltage and amp draw at the pump during start-up then again after 20 min. Lonnie

05-31-2015, 12:32 PM	#4
Ken/Alabama Senior Member Join Date: May 2010 Location: Alabama Posts: 3,260	Re: No fuel pressure after 20 mins driving Is the gas cap vented?

05-31-2015, 12:51 PM	#5
Lawson Cox Senior Member Join Date: May 2010 Location: Above the gnat line in Georgia Posts: 7,009	Re: No fuel pressure after 20 mins driving Hook up a mechanical gauge and see what the pressure is. __________________ Life is like a roll of toilet paper. The closer to the end, the faster it goes. It is better to be seen, than viewed. "We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm".

05-31-2015, 12:58 PM	#6
f1builder Senior Member Join Date: Jan 2011 Posts: 554	Re: No fuel pressure after 20 mins driving Sponsored Links (Register now to hide all advertisements) with 3 carbs you might want to move it up to 3 or 3 1/2 and try that for a while. i run 2 97's and 2 1/2 is a little less than it wants, especially in 2d to 3rd gear at around 60, it stumbled a bit at 2 1/2 and the pressure dropped off to almost 0. also tuned the idle adjustment on the front carb so it is opened up about 3 turns instead of 1 1/2 or 2. just tinker with it till it gets where you want it.

05-31-2015, 01:27 PM	#7
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,936	Re: No fuel pressure after 20 mins driving Right after the 20 minutes when it stops running, disconnect the fuel line at the carburetor and see if the fuel pump is pumping fuel. If your fuel pressure gauge is one of those after market 'liquid filled" gauges, drain the liquid out of it and it will probably show a reading. That's what I did to my liquid filled gauge. Even though it read "zero" it was really pumping fuel. Don't know what regulator you're using, but i found the little Holley regulators to work good.

05-31-2015, 01:29 PM	#8
dgkipp Member Join Date: Dec 2011 Posts: 64	Re: No fuel pressure after 20 mins driving Used two new holley regulators

05-31-2015, 01:31 PM	#9
dgkipp Member Join Date: Dec 2011 Posts: 64	Re: No fuel pressure after 20 mins driving Hooked up 2 new liquid gauges. Both the same results

05-31-2015, 01:31 PM	#10
sidevalve8ba Senior Member Join Date: May 2013 Location: Harrisonburg, VA Posts: 842	Re: No fuel pressure after 20 mins driving When the fuel pressure drops to 0 does the engine die out from lack of fuel? __________________ The more I learn about new automobiles, the more I value my old ones.

05-31-2015, 01:32 PM	#11
dgkipp Member Join Date: Dec 2011 Posts: 64	Re: No fuel pressure after 20 mins driving Gas cap is vented. Even tried it with no gas cap.

05-31-2015, 01:33 PM	#12
dgkipp Member Join Date: Dec 2011 Posts: 64	Re: No fuel pressure after 20 mins driving Yes starts stumbling.

05-31-2015, 01:43 PM	#13
36 flathead Senior Member Join Date: May 2010 Location: pittsburgh pa Posts: 138	Re: No fuel pressure after 20 mins driving sounds like garbage in the fuel tank.

05-31-2015, 02:04 PM	#14
Joe Immler Senior Member Join Date: Dec 2012 Location: Massillon, Ohio Posts: 783	Re: No fuel pressure after 20 mins driving I agree with 36 flathead. I had a same situation. Found there was a piece of masking tape that floated around in the tank and it was eventually attracted to the fuel line and stalled the engine out. Of course, after stopping it started floating around again. Oh yeah, how the tape got there is a complete mystery ! You should be able to remove the gas gauge unit on the top of the tank and look around with a bright flash light. I could see nearly every part of the bottom of the tank. Let us know the answer to your problem.

05-31-2015, 02:36 PM	#15
Lanny Senior Member Join Date: May 2010 Location: Mn Posts: 2,411	Re: No fuel pressure after 20 mins driving If the tank isn't new, or if it's original, and hasn't been professionally cleaned' then I would change the fuel filter fairly often. . __________________ If mama ain't happy, ain't nobody happy. But if daddy ain't happy...RUN

05-31-2015, 03:38 PM	#17
30-9 Senior Member Join Date: Aug 2014 Location: MA Posts: 888	Re: No fuel pressure after 20 mins driving He said car stumbles - I doubt gauges have anything to do with it __________________ Thanks - 30-9 1939, 1940

05-31-2015, 04:42 PM	#19
George/Maine Senior Member Join Date: May 2010 Location: Mid coast Maine Posts: 1,878	Re: No fuel pressure after 20 mins driving I would move the filter to inlet at fuel block. Then blow back fuel line with 40 lbs. air. to tank.