Quadrajet 4bbl/Edelbrock street fuel pump- too much fuel pressure? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-29-2008, 05:10 PM
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Quadrajet 4bbl/Edelbrock street fuel pump- too much fuel pressure?

Well guys, after 3 years, I installed an ISKY 216/216 camshaft in my 454, got it back in the '74 Corvette and all summer I've been getting ready to fire it back up and break in the camshaft.

So, today was the day. Everything went fine and I managed to run the motor for 20 min at 2500rpms, breaking in the cam.

The only problem was that fuel was dripping out of the accelerator pump and the vent tube (not enough to stall the motor at 2500 but difficult to keep idling).

I cleaned up the gasoline and pushed the car back in the garage.

I believe that the Quadrajet was getting too much fuel pressure from the Edelbrock street fuel pump (worked great with the Demon a few years ago).

The carb was rebuild last Feb and literally has only 20 miles on it- and, NO problems with fuel coming out the top. I did use the carb on my 350 before deciding to install the 454 back in, so I do know that it ran well.

So, I am going to order a stock fuel pump and steel line.

What do you guys think? Am I correct in my thinking that there's too much pressure?

Thanks!

Bob Turner

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Old 11-29-2008, 06:54 PM
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Bob, I just posted a similar problem I am having with a Q jet. I did not try to start because I wanted to see if the pump over pumped or not and it did. Its a napa 4-6 lbs. I'll have to get a gauge to check it.
Let us know how u make out.
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Old 11-29-2008, 11:50 PM
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First thing you need to do is to put a fuel pressure gauge to it.
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