High Fuel pressure??

[rchevelle71]

What would cause my fuel pressure to be high after rebuilding carbs??

Was like 5# before, now reads 12# at idle, but not leaking past needle/seat??

It currently has an electric fuel pressure gage with a sender, I will verify with mechanical gage, but I cant see what would make it get that much higher??

[Jay Smith]

12# is WAY too high IF your gauge is accurate...Needles and seat might hold a while sitting still BUT the bouncing and bumping when running WILL cause them to leak at that high pressure...

JMO,
Jay

[rchevelle71]

12# is WAY too high IF your gauge is accurate...Needles and seat might hold a while sitting still BUT the bouncing and bumping when running WILL cause them to leak at that high pressure...

JMO,
Jay


Thanks Jay,

I figured 12# was too high, and eventually will leak, but any idea how it got that high?? Was fine before I rebuilt carbs?? After I seen it that high, I replaced the fuel pump, but still high. Actually drops when I hit the gas, and the needles on the carbs open up?? I did run it like this a few miles idling, and a few miles at WOT, no problems(YET), but wife wants to take people out next weekend, and last thing I need is the needle/seats giving up, and have fuel leaking all over:eek:

[Jay Smith]

Im not a carb guy BUT when I was running them I use a Holley regulator at 4 to 5 PSI.. I never had much much higher... Might try to locate a holley regulator..

JMO,
Jay

[jphii]

Do you run a return line? If you do might it have gotten kinked when you reinstalled the carbs? The would raise your pressure.

[rchevelle71]

Just a stock setup, diaphragm style stock pump mounted on motor, enrichment valve thingy, no return line that I know of, no room for regulator between pump and fuel inlet on carb.

[jphii]

Where is your sender at?

[rchevelle71]

Where is your sender at?

mounted inline just above the carbs, between the pump and carb inlet

[jphii]

I will verify with mechanical gage


mounted inline just above the carbs, between the pump and carb inlet

I'd try that, putting it where your sender is. 12# should be dumping fuel all over.

[Dave Strong]

mounted inline just above the carbs, between the pump and carb inlet
Have you checked it with a master guage,JMO not a big fan of electric guages.
Dave

[rchevelle71]

Have you checked it with a master guage,JMO not a big fan of electric guages.
Dave


Not yet, I will get one this weekend, I also believe it is the sender, and dont care for electric gages, but it was the easiest way to get a gage in the dash and worked fine for over a year.

[rchevelle71]

Thanks guys,

I figured it out, it was a bad sending unit as I suspected. Got a mechanical gage, and even though it bounces(not liquid filled) it runs between 3 and 7 pounds, with 8-9 at WOT.