Why not this fuel pump?

[HOBrian]

Everyone on here is always looking for a better fuel pump/lift pump. This maybe some really dumb questions and if I am wrong please tell me. Why not a fuel pump from a gasser? (This would be for those 05's and anybody who changed to the in tank style. ) I know they have a lot more fuel pressure than we need but with the fuel pressure regulator why could it not be turned down? Does the Cummins need more volume? If it did, could you not just turn up the fuel pressure. I am just thinking out loud so if this is just crazy talk then off to the padded room I go...

 

[mberry]

Brian,



In short, gasser fuel pumps really can't stand up to the demands of diesel fuel itself. Different rubber compunds in the seals, weaker motors etc... Diesel is thicker than gasoline so the pumps have to be heavier duty. The Cummins does need more volume, but on some trucks, and help me if I'm wrong, have a problem with fuel that is delivered over 15psi.



If you care to do a search, there has been discussions of this in the past and may be something you could read since I am by no means an expert.

 

[rbattelle]

I think a gasser fuel-injection type in-tank pump would produce way too much pressure. Modern gasoline injection systems run 40 or more psi, and that could probably destroy the fuel control actuator on the back of the CP-3 in a very short time. I have no idea what the flow rates on the gasser pumps are.



I think (and please, this is only my opinion... not fact) that if you're going to go to the trouble of re-engineering your low pressure fuel system you might as well build a system that is more maintenance friendly. This can be done by using commonly available standardized fittings and components (NPT and AN or jic). Leave the pump out of the tank and mount it under the truck close to the tank. And while you're at it, plumb in some additional filtration.



FASS (or AirDog) provide some of this functionality. They don't change out any lines or fittings to standardized parts, so if your FASS breaks down on the road you're out of luck until you can get a new one. But it's a simple install.



-Ryan