The Ford Barn

PGBuick · 04-20-2026, 08:01 PM

Running a '48 59AB in my 36. Have a fairly new mechanical fuel pump (not sure where made, but it appears to be a good quality pump). I have a formed hard line between the pump and Stromberg carb and a fuel pressure gauge t'd off it. Seems it used to run 2-3 psi last fall, but now is down to 1 psi and the gauge flutters a lot. Seems to run fine until it's warmed up, then it's either flooding or starving and runs poorly. I have an inline electric pump to push potential vapor lock through, but never needed it.
What should the fuel pressure be with liquid fuel coming from the mechanical pump? Is the gauge fluttering a symptom of pump diaphragm failure, or maybe something else?
Thanks all.

04-20-2026, 08:01 PM	#1
PGBuick Senior Member Join Date: Nov 2021 Location: Central Mass. Posts: 103	What is enough fuel pressure? Running a '48 59AB in my 36. Have a fairly new mechanical fuel pump (not sure where made, but it appears to be a good quality pump). I have a formed hard line between the pump and Stromberg carb and a fuel pressure gauge t'd off it. Seems it used to run 2-3 psi last fall, but now is down to 1 psi and the gauge flutters a lot. Seems to run fine until it's warmed up, then it's either flooding or starving and runs poorly. I have an inline electric pump to push potential vapor lock through, but never needed it. What should the fuel pressure be with liquid fuel coming from the mechanical pump? Is the gauge fluttering a symptom of pump diaphragm failure, or maybe something else? Thanks all.