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EFV-8 Club Forum / General Ford Discussion / fuel pressure

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Discussion Topic: fuel pressure -- page: 1 2 3

johnmyron

02-24-2014 @ 2:54 PM

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Had fuel pump issues with my freshly overhauled 53 Sunliner. Installed a 12V electric pump, and pressure regulator stright to a brand new Dennis Carpenter Carburetor.Idles great and run at speed ok but stuttere and seems to miss on acceleration. Fuel pressure regulator set at 3 psi. Could it be starving on acceleration, or flooding, or? lack of vacuum advance on distributor? Any thoughts?

40 Coupe

02-24-2014 @ 3:05 PM

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3# is a bit too high, take the pressure down to 2.5 Max, 2# Nom.

ken ct.

02-24-2014 @ 3:54 PM

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Coupe is correct 2-2 1/2 is more like it. ken ct omo.

supereal

02-24-2014 @ 4:01 PM

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Stumbling on acceleration is often due to insufficient accelerator pump delivery. With the air cleaner off the car, look down the carb as you work the throttle with the engine off. You should see two ample jets of fuel. If your carb has an adjustable pump link. Put it in the longest stroke to see if the problem changes. Stumbling on acceleration is seldom due to high fuel pressure, but more often on low fuel level in the bowl. Be sure your float is at correct adjustment. Being new doesn't always mean it is correct.

ford38v8

02-24-2014 @ 4:10 PM

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I'm sure my buddy Supereal meant to instruct to do that test with the engine off. Looking down the carburetor while pumping the accelerator can be like looking down the barrel of a gun even if the engine is running good.

Alan

Stroker

02-24-2014 @ 4:22 PM

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Alan: Go back and read Super's instructions.

johnmyron

02-24-2014 @ 5:13 PM

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Will crank the pressure down and try it. So, if you are saying pressure is too high, the stumbline would be to flooding on acceleration? Checked accelerator pump delivery when I installed new carb and it looked ample.
Thanks to all you who replied.

johnmyron

02-24-2014 @ 9:13 PM

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put fuel pressure down to 2 psi. adjusted accelerator pump linkage to longest stroke. No real change. Still seems to almost miss, or run rough on acceleration. What next?-pull the new carb apart and check the float level. These carbs are advertised as "Bench Tested." Again-idles great and runs smooth once you reach level speed. Original distributor worked fine and put it back in with a pertronix unit. Could it possibly be vaccum advance?

ford38v8

02-24-2014 @ 9:15 PM

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Dan & Bob, A mistake on my part, for which I'm only too happy to apologize... Still much better than a face full of carburetor backfire from misreading the instructions as I had.

Alan

cliftford

02-25-2014 @ 6:29 AM

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Given all of the above info, I would suspect the acceleration pump check valves. Cliftford

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