[blackrider71]

i have chevy 468
roughly 440 (horsepower)

Is a holley blue fuel pump (6.5 psi)
with 3/8 fuel line.

do i need 1/2 line would it help on top end?

a quick fuel double pumper carb 830cfm can it handle high psi with
out flooding , or should i just keep it at 6.5 psi.

[ericnova72]

Raising psi at the regulator won't help, it will just cause problems with fuel control in the bowl. If it is running out of fuel now one fix would to raise the psi at the pump, the blue pump is 12 psi(Moroso or MrGasket sells a stiffer relief spring IIRC for the Holley pump to get 16-18 psi) or put a better pump on the 3/8" line. The other fix would be going to 1/2" line with the current pump for more volume.

At 440 hp you should be fine now unless there is a restrictive point in the current 3/8" system like hardware store fittings and 90° fittings, a lot of bends, trash on the in-tank sock on the pick-up, using too much hose or kinked/collapsed hose, restrictive filter.

[blackrider71]

ok that tells me what i need to know thanks

[Bad Influence Racing]

I would run atleast a 1/2" line, and I would run the Mallory 140 pump. Don't use a blue or red pump as a door stop. The Mallory will be much more user friendly on the street, and is dead quiet. 6.5-7psi is fine for now. This is all for this application, but if you plan on making alot more power, I would do it once and do it right. If this is all it will see, then you will be fine with this.

Kris

[ericnova72]

I agree with you Kris when starting from scratch, the Mallory is good stuff and 1/'2 line leaves room to grow . Prefer and use Mallory or better gearotor pumps myself. Just trying to help the OP with Holley Blue and 3/8" line set-up, it will work for him if there isn't some strange restriction problem in his complete line routing. Myself and friends have run Holley Blues for many years and never had a failure, the Holley Red just isn't worth buying IMO due to self regulating at so low a pressure/no regulator.

[blackrider71]

I all ready have a holley blue pump
on there now

Im going to get 140 mallory and 1/2 fuel line thanks

[cobalt327]

Originally Posted by blackrider71

I all ready have a holley blue pump
on there now

Im going to get 140 mallory and 1/2 fuel line thanks

That pump, equipped w/a return style regulator would make an excellent fuel system, IMHO. Deadhead regulators work (obviously) but the pump runs hotter.