Fuel Supply pump?

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Farmallgray

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Nov 4, 2009
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This may be a bit off the wall for you guys. I'm building a pulling garden tractor
with a 68 cube 3cyl turbo'ed engine with a mechanical injector pump. I'm wondering what to use for a supply pump. Another guy building one had a pump shop recommend he use a supply pump with 40psi output. That seems like a lot to me. I am wondering why you couldn't use a holley blue pump that puts out 100 GPH at 14psi. what do you guys think?

I would have thought volume would be more important than pressure, but maybe I'm not understanding correctly?
 
I would use a 150gph Raptor pump built by PureFlowAirDog, it has an external adjustable pressure regulator and will go well past 40psi. Volume and pressure are both important, pressure gives you the proper plunger fill and volume maintains pressure under high fuel demand.
 
MSD Ignition 2225 MSD High Pressure Electric Fuel Pump

All you will ever need for that engine. Put one on a 4bt in a jeep making over 250hp. and pressure does not move off the set point of the regulator. Biggest concern you are going to have is supplying enough amperage to the pump off a small engine like that. At 6 amps max it should be no issue with that pump. Those gerotor pumps suggested above will draw at least 20 amps and prob. wont do half what they are rated at running off a battery or a alternator sized to that engine if it even has one.
 
Walbro 255 is more then enough pump. Or really just about any stock fuel pump found on any EFI car out there should be enough for that.
 
I am all for overkill, but that is kind of like the engine needing a straw to be happy, so overkill is a garden hose, the 150gph pump would be like a fire hose. :kick: :hehe:

68CID is only ~ 1.1L
 
LReiff said:
I personally like extra fuel, it's always a bite in the shorts to find out later that you don't have enough fuel.
Click to expand...

I know my truck is pretty tame here with around 500hp, but my 95 GPH Fass keeps it plenty happy. If he can get that out of a 68 CID engine, a 95 is still more than enough.
 
I'm running a 15 amp alternator. The water inj pump will be using up some of that too. Is the Walbro 255 the same as the MSD pump that Sinner listed? I believe that is the pump another guy building one of these is using. Do I need a regulator with it?

DVST8R, when you say any EFI pump are you talking multi-port only? TBI is usually less than 20psi.

Thanks Guys.
 
Yes sorry, any multi port efi, should have base pressures around 40-45psi, and have more then enough fuel for this.
 
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