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Proper Fuel Pump Pressure

chuckhanson

chuckhanson

Regular Contributor
I have 1984 454 CID Cruisaders with Rochester QuadraJets.

My fuel pump is rated for 5 to 9 psi. I have not measured the pressure at the carb yet. Is 9 too much?

Chuck Hanson
 
9 psi is a bit high, 4-6 psi will keep the needle, seat, and float happy. If you still prefer those lower rpm operations, 4 psi will be more than adequate.

If you need to dial it down, a pressure regulator should be much cheaper than another pump.

9 psi will be more that the float will handle, even if you change the inlet to, say, a 0.110 size.
 
HI Chuck; are you having a too rich condition at low speed?
I've thought about fitting in a 0 to 15psi fluid filled guage between the carb and pump, but haven't done that yet. You might consider that temporarily.
 
Chuck:

Holley sells a really nice regulator that is adjustable. About 30 bucks. Here's what it looks like.


Jeff
 

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Yes, the Holley parts have been around for years. Very reliable as long as the fuel flowing into them stays clean.

Sourcing? - fastest would probably be Jegs or Summit. sure a www search would provide a few more options.

I'd look for a marine rated part.
 
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