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post #1 of 8 Old 07-27-2011, 10:33 PM Thread Starter
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wiring 318 electric fuel pump

anyone have some advice on how to wire an electric fuel pump?

i was thinking with a relay going off the oil pressure switch. that way, whenever the pressure switch closes (when there is oil pressure) the pump turns on and whenever it opens (engine loses oil pressure) it turns off.

was also thinking a relay off the hour meter, but that might not be a good idea as it could easily flood the engine if the key was left "on" for some reason.

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post #2 of 8 Old 07-27-2011, 10:54 PM
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Re: wiring 318 electric fuel pump

I am not sure if you jump from the oil sending unit will work. Usually the electric fuel pump need to have power to prime when you turn the key on.
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post #3 of 8 Old 07-27-2011, 11:18 PM
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Re: wiring 318 electric fuel pump

When I did my 318 I used the hour meter to power the relay. It worked fine and I only removed it after having to replace the stater and found that mice had chewed a hole in the vaccuum line to the fuel pump. It was on for over 1 year. Does draw some DC power.

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post #4 of 8 Old 07-27-2011, 11:37 PM
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Re: wiring 318 electric fuel pump

Mine is wired to the positive side of the coil.

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post #5 of 8 Old 07-28-2011, 07:43 AM Thread Starter
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Re: wiring 318 electric fuel pump

thanks guys. agree on the priming, so maybe the hour meter is the way to go. d-dogg, is your's powered direct from the coil or is a relay used?

anyone have a wiring diagram of how these are wired in a 400?

2001 JD 345
54" MMM
44" Piranha MMM
JD 48" Front Blade

1988 JD 855
70A Loader
7 Backhoe
60" MMM
503 Rotary Cutter
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post #6 of 8 Old 07-28-2011, 07:46 AM
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Re: wiring 318 electric fuel pump

I use no relay, Jakenbake. My pump is tiny and not much of a draw. The PO did the conversion quite a while ago, and no troubles.

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post #7 of 8 Old 07-28-2011, 07:46 AM
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Arrow Re: wiring 318 electric fuel pump

Tap into anywire that comes on when the key is turned to RUN.. I wouldn't do the Oil switch though as already suggested.. The key is on= the pump will run.. Sound right?


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post #8 of 8 Old 07-28-2011, 08:44 AM
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Re: wiring 318 electric fuel pump

I tried the electric pump but did not care for it,I now use a vacuum pump from John Deere Gator 2 wheel drive,works fantastic.

Jim

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