General Category > Quadrajet Carb Talk and Tips

fuel pressure creep.

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Cliff Ruggles:
I would add that my system uses a bypass back to the tank to take the load off the pump.  It's a home made system right before the regulator.  I used a 3/8" NPT "T" into the bottom of the regulator and came off one side with a 90 degree 3/8" to 5/16" inverted flare fitting to the factory return back to the tank.  I made a provision to shut it off for racing but have never ran into any fuel delivery issues so leave it open.

When the system was first installed I ran it "dead-head" and it fried the pump in a couple of months of street driving.  At that time I  bought another one, and added the bypass.  The original pump was rebuilt and shelved (only needed brushes).  The pump acts much better with the bypass, quieter and obviously lasted much longer than running it "dead-head" as it's been in service now for almost 20 years......Cliff

tayto:

--- Quote from: Cliff Ruggles on November 13, 2018, 03:16:45 AM ---I use the same basic regulator from Holley, been dead solid reliable now for over 20 years....

--- End quote ---
i meant using a regulator on a non-electric pump

Cliff Ruggles:
I've used them with mechanical and electric pumps w/o issue....

tayto:
Should I get a regulator with a return line or is it OK to let the mech pump handle the return? My truck has A/C so has factory return line I believe.

If i was able to lower my fuel pressure from 12 psi to 5.5 psi could I in turn then reduce my float height? With my setup you recommended 9/16" could it be lowered to 1/4" as discussed if your book?

Cliff Ruggles:
For the Edelbrock 1904, 1905 and 1910 units and most later model factory Q-jets I typically set the fuel pressure around 6-7 psi and the float at 9/32"......Cliff

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