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Topic Review (Newest First)
09-20-2012 08:38 PM
Cape Cod Bob After reading lotsa info on this when I put in my electric pump , the consecus was that a 7=8 lb pump running to a 4 lb reg will be OK without the return line. I used a napa pump .
How old is your pump? I was told by an napa old timer that they don't last to long. Maybe you just need a new one.
09-19-2012 09:09 PM
keitho64 OK so I am going to resurrect an old thread. My 1969 911 has an electric fuel pump mounted in the engine compartment. It is feeding a pair of weber carbs so I am running the fuel pressure at 4psi and it is controlled by an adjustable regulator. This was the factory installation so it has been this way for a long time, it is pulling the fuel through rather than pushing.

I am running into a situation where the fuel pressure will intermittently drop to 1.5 to 2 psi. When this happens my wide band o2 sensor will show AFR greater than 15.6.

I am going to relocate the fuel pump and mount it at the base of the tank and push the fuel through vs pull, which is how it is operating now. I am not sure if my pump is failing, if it is sucking air or vapor locking.

After reading this thread and a few others the general consensus is electric pumps operate better when pushing. I know my car came from the factory with the electric pump pulling but the modern fuel blends may be playing a part in the problem.

OK so now the real question, should I add a return line for the tank while I am at it? Is a return line needed on a carb setup? I assume not since it never had one but best to check first.


12-31-2010 05:28 PM
Torque454 Lower than the fuel tank and as close to it as possible.
12-30-2010 11:12 PM
inrc Ok understood. thanks
12-30-2010 10:04 PM
nastynova I was trying to simply state that your quote it correct... and the other placements in incorrect places can lead to problems... that all...
12-30-2010 10:01 PM
Originally Posted by nastynova
^^this... improper placement leads to premature failures...
How so? It's best to gravity feed the pump, and for drag racing it's best to have the pump behind the tank/cell.
12-30-2010 07:53 PM
Originally Posted by WDCreech
Electric pumps push better than they pull, so the best place for one would be slightly lower than the tank outlet, but close.
^^this... improper placement leads to premature failures...
12-30-2010 04:17 PM
airboat Best place is behind fuel tank and lower. Can't always have best... Will it work... Sure...Could it cause problems, Sure...
12-30-2010 04:17 PM
WDCreech Electric pumps push better than they pull, so the best place for one would be slightly lower than the tank outlet, but close.
12-30-2010 04:12 PM
Best place to install electric fuel pump?

Will the edelbrock fuel pump 1791 work well installed by the engine rather than the fuel tank?

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