General Category > Quadrajet Carb Talk and Tips
Fuel pumps
hiy_po:
Fuel pumps anyone ???
Kenth:
One of these may do the job?:
https://www.summitracing.com/search/product-line/carter-universal-rotary-vane-electric-fuel-pumps/part-type/fuel-pumps?SortBy=BestKeywordMatch&SortOrder=Ascending
lightning boy:
Okay, 230 hp at the wheels means 275 at the crank, lets just say a little more in case you want to turn it up later-300 hp. A 300 horse motor on boost will use 124 liters per hour of fuel. So you are right the pumps you have shown are not going to work. Instead of staging the pumps together or running twin pumps, you dont need to, not at the power you're making. There are so many factory installed pumps to do what you need the choice is yours. Any Denso pump off a similar hp car will do.They are factory Toyota parts. Walbro pumps are installed on thousands of GM products and it wont be hard to find one that flows 124+ per hr. If you are stuck on a German pump, a Bosch 040 or 044 would do anything you will need. Just be sure to run a regulator on the back (downstream) side of your carb and then return back to the tank.
hiy_po:
Yer I was using a high pressure EFI pump for quite some time. but I ran two regs. first had the return and was set to 25psi fuel pressure then ran a second reg that regulated it down to 4 psi to feed the SUs.
I want to use less. I want to use the OEM style pumps because they need to run at full flow at all times. I still run a single reg but is before the Quadrajet and has the return.
I am thinking if two inline pumps both high flow rated and 1st one tank fed cant keep up with the demand will go up a fuel pipe/hose size. Change to half inch or bigger.
So maybe the 102 LPH flow at 5-9 Psi maybe a better choice than 100LPH @ 3 -5 psi I was leaning towards the later of the two.. The one in the tank runs the car now at 5psi. I dont think I have maxed this system out yet. But when I do put a demand on the fuel supply it still needs enough to go back via return to keep the swirl pot full
Another option is buy a Pierberg chinese copy for half price and road test it.
Cliff Ruggles:
The later Q-jets will handle high fuel pressure w/o issues so I'd go with the higher pressure pump.
I use a 1977 Pontiac carb on my own engine with a 140 GPH electric pump feeding it thru 8AN fuel lines. I use a regulator set at 7.5 psi and it has a return line to the tank.
That system effectively feeds over 550hp/600tq w/o the first hint of a fuel delivery issue. I use a .145" fuel inlet seat, but tested it with .125", .135" and .149" seats as well. I only ran into an issue with the .125" seat when I tried running less than 5psi fuel pressure.......Cliff
https://www.youtube.com/watch?v=6zVdoLR-VzM
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