Thread: Electric Fuel Pump Suction

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Yeah Matt, I know those numbers are right from working with one of my boys when he was running a Fox body Mustang, and I'm pretty sure that it would "work", but it's just not the right way to do it, and as you point out it may be an expensive venture if the new pump does fail. I agree with HWorrell, electrics are not designed to suck, and like Mike52 said, you'd never know when it might fail, but Murphy says it would be at the most inopportune moment possible! I like Robot's approach, too, plumbing in one suction split to two pumps, back to one supply line, so a guy could swap a wire and keep on truckin'. I also like Pepi's super clean install, but in this case my friend's tank is mounted between the frame rails in back, totally enclosed by trim panels . The right answer, like Charlie says, is drop the tank, pull that old pump, re-plumb the system and install a high quality filter & pump external, mounted low on the frame rail. Jerry, luckily it's not a body lift!!
Thanks to each of you for your input! I appreciate the help getting to the right answer, and will pass it on to my buddy, much to his dismay

I like the idea of 2 pumps also. A hidden switch would work pretty neat too, and the possibility of running both pumps at once for extra flow if any major power adders ever came along. 2 ignitions is arleady pretty common

You cannot do two pumps in parallel without a pair of check valves.....in the jeep we have two pickups, two pumps on separate lines that are manually transferred....or you could use a valve. ..... IF you were to run two parallel pumps and had no check valves, the running pump would simply pump back thru the "off" pump and back to the tank.

When I spoke about access through the trunk floor I was refering to the access of the pump not body bolts, just clarifying.

Originally Posted by robot

You cannot do two pumps in parallel without a pair of check valves.....in the jeep we have two pickups, two pumps on separate lines that are manually transferred....or you could use a valve. ..... IF you were to run two parallel pumps and had no check valves, the running pump would simply pump back thru the "off" pump and back to the tank.

Yeah, my "summary" was wrong about he suction side - one suction line, installed to whichever pump is being used with the other plugged, or simply a second pump waiting for suction & discharge lines to be swapped along with the electrical. Parallel indeed requires valving to function.

Originally Posted by pepi

When I spoke about access through the trunk floor I was refering to the access of the pump not body bolts, just clarifying.

Yep, I understood and it's a good idea. Right now he's set on getting the pump out of the tank, but I'll pass on that idea, too. If he knows where the pump sits on the tank after all this time it would be an easier approach! Thanks for clarifying your thoughts!

" If he knows where the pump sits on the tank after all this time"

LOL ...... well that certainly make sense.

I think it was on the Holley site the other day I noticed they have a new dual pump out.... Can use one side for fuel, one for extra fuel with nitrous, or just run the other side as the spare. Pretty simple to just switch wires from one side to the other. End up with a setup like Robot runs with the dual pumps!

Originally Posted by pepi

" If he knows where the pump sits on the tank after all this time"

LOL ...... well that certainly make sense.

I guess the worst that could happen is he'd have an "access panel" covering most of the trunk floor.