Fuel pump requirements

[Makinchips]

What do you think the minimum pump is required on a car that goes 10.66@128. W/a 1.55 60ft. 3200lbs
This is a bracket/street car a friend has.

[Mike Pearson]

something like a Holley blue pump will get the job done. 1 gallon in 30 seconds is the flow you need on a car of that speed.

[Jim Whitehead]

Holley Black

[pmrphil]

Mechanical or electric?
My street car is 3260 w/me in it, runs 10.60's @127 and has a regular old Carter mechanical pump with 3/8 lines.

[Makinchips]

Funny how things change with the times. Is that 1gallon measurement thru 2 needle&seats at full drop?

[Hacksaw]

Fuel pumps are rated at free flow, so if you take a Holley blue and with 3/8" lines you hold the out line in a empty fuel can and run the pump for 15 seconds you should see slightly less than .5 of a gallon. This is adequate for this combo, but IMO borderline. I would use a min. of 250 gal/hr pump. Remember that line size, bends in the lines, filters, pick up location from tank, fuel regs, and fitting choices among other things can reduce the actual flow to the carb. Take caution when checking free flow. No burns....

[HP HUNTER]

It surprises me that theres no mention of g force on the launch, thats the whole problem with a 12 PSI fuel pump. Theres a reason bigger pumps run over 20 PSI out.

[Makinchips]

He's running a single blue now.
I had freshened the engine after it ate a lifter. Upped the comp to 11.1,had the heads ported and upped the cam on his request.
Only picked up 2mph from unported heads a point less compression and a cam that's 7degrees smaller on the intake lobe.
Sorta looking for answers i guess.

[Rory McNeil]

Whats the combination? A car with a Holley 4 barrel is much easier to keep fed than say a Quadrajet on an otherwise identical application. A single Holley "Blue" electric pump should be more than adequate for a car like that with a Holley carb. My bracket car with a Holley 650 carb ran 10.2ETs at 130 MPH, 1.36 60 foot times with a single Holley blue, with a stock gas tank and 3/8" steel fuel line. I know a few guys with similar cars that run similar times with a Carter mechanical pump, but very unlikely a QJet car would get to 1/2 track under power with the same fuel system.

[HP HUNTER]

Originally Posted by Rory McNeil

Whats the combination? A car with a Holley 4 barrel is much easier to keep fed than say a Quadrajet on an otherwise identical application. A single Holley "Blue" electric pump should be more than adequate for a car like that with a Holley carb. My bracket car with a Holley 650 carb ran 10.2ETs at 130 MPH, 1.36 60 foot times with a single Holley blue, with a stock gas tank and 3/8" steel fuel line. I know a few guys with similar cars that run similar times with a Carter mechanical pump, but very unlikely a QJet car would get to 1/2 track under power with the same fuel system.

1320/130=10.15 and thats just a jumping off point. In the 80s I had a 68 Chevelle with a Holley pump that ran 10.70s, stalled the fuel on the launch, changed the spring to the heavier Moroso spring, with no other changes the car went 10.48, and I suspect that still wasn't enough. Although I will say this car left extremely hard for a 10 sec car, which had a lot to do with why the fuel system was taxed. As far as the Q-Jet goes, I've got stories if anyone interested, I've seen this tried, no way will this work-ever.