Fuel pump PSI fluctuation?
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Joined: Feb 2001
Posts: 140
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From: Muskegon, MI
Fuel pump PSI fluctuation?
After about 7 months of building my own 383 (the fun part) and then installing it into an 87 Camaro I finally got it running today.
One thing I noticed was a large fluctuation on my fuel pressure gage, reading a rapid 3 to 9 PSI.
The 87 has an in-tank fuel pump and a mechanical pump (with return line), which I am using.
Why so much fluctuation?
BTW, I should add that I have pulled all of wires from from the pass. side harness route and have not rewired the fuel pump relay. I am not running a fuel pressure regulator either.
I started out with the stock pump (Carter with ret. port) just for simplicity, just to get it running. I have a nice new Edelbrock sitting on the bench. Would I be better off using that pump and just plug off the return line?
Thanks
One thing I noticed was a large fluctuation on my fuel pressure gage, reading a rapid 3 to 9 PSI.
The 87 has an in-tank fuel pump and a mechanical pump (with return line), which I am using.
Why so much fluctuation?
BTW, I should add that I have pulled all of wires from from the pass. side harness route and have not rewired the fuel pump relay. I am not running a fuel pressure regulator either.
I started out with the stock pump (Carter with ret. port) just for simplicity, just to get it running. I have a nice new Edelbrock sitting on the bench. Would I be better off using that pump and just plug off the return line?
Thanks
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Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
The pressure from mechanical pumps tends to pulse each time the fuel pump lobe on the cam turns.
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