Electric with a mechanical fuel pump? - JeepForum.com
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post #1 of 5 Old 10-23-2009, 11:01 AM Thread Starter
Hybrid Jeep
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1976 CJ5 
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Location: Monument, CO
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Electric with a mechanical fuel pump?

Hey guys.. I'm at the stage of my build where I can easily put an electric fuel pump in line with the factory mechanical fuel pump. Can anyone think of any problems with this? The mechanical pump will have to pull through the electric... with the electric only being used as a back up.

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post #2 of 5 Old 10-23-2009, 11:13 AM
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1978 CJ7 
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I have the mechanical one up front and an electric one in the back by the tank-- I had some circuit problems with it at first but that's probably because of the way some idiot re-installed the wiring harness years ago.

I have the electric one on a circuit I made completely seperate with its own little fuse block and I have it on for a few seconds before starting the engine and the entire time it's running.

If yours is like mine (304) and sometimes needs a little help on a cold start, the extra pump will help A LOT plus you can still gas it a little upon start-up if needed.

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post #3 of 5 Old 10-23-2009, 11:15 AM
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Just to make sure this part is clear--- My electric one is in line before the mechanical one.

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post #4 of 5 Old 10-23-2009, 11:16 AM
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It can cause a restriction, making it harder for the mechanical to pump. I think you should just sticck with the mechanical if you aren't going EFI. With mechanical, you have less wiring to worry about, the fuel stops as soon as the enigne stops (electric you should use an oil psi switch for this purpose), and they are not all tha failure prone in my experience. Electric you have to orry about protecting wires, loose connections, pressure regulator, etc. More of a hassle to me.


1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

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post #5 of 5 Old 10-23-2009, 05:10 PM
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Before I went TBI I installed an electric pump, worked great and in a CJ would never go back to a mechanical one. I bypassed my mechanical pump, there was just no need for it. Used a small block Chevy plate to clode up the mechanical port.

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