The Ford Barn

Bob from Northport · 03-14-2015, 11:04 PM

Can anyone explain why- when using a non original ignition switch-the on/off type- would an electric fuel pump not work when connected to the ignition side of the circuit going to the coil??

Thanks!!

Tom Endy · 03-14-2015, 11:22 PM

Because when wired such the pump is in parallel with the ignition points. You have to wire the car such that the pump is at the point where voltage is applied to the top of the coil, not the bottom.

Tom Endy

WestCoast · 03-15-2015, 12:12 AM

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it will work as long as its not connected to the dist side of coil, it can be hooked to the hot side side of coil, the negitive side, to be safe tho, the hot side wire must be hooked up so the pump is turned off when the key is turned off, if you hook the pump to the dist side wire it will cause misfires, robs electric power

03-14-2015, 11:04 PM	#1
Bob from Northport Senior Member Join Date: May 2010 Location: 215 E. 6th Street Northport, Michigan 49670 Posts: 1,005	Voltage question Can anyone explain why- when using a non original ignition switch-the on/off type- would an electric fuel pump not work when connected to the ignition side of the circuit going to the coil?? Thanks!! __________________ Bob from Northport Northport, Michigan

03-14-2015, 11:22 PM	#2
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,168	Re: Voltage question Because when wired such the pump is in parallel with the ignition points. You have to wire the car such that the pump is at the point where voltage is applied to the top of the coil, not the bottom. Tom Endy

03-15-2015, 12:12 AM	#3
WestCoast Senior Member Join Date: Sep 2014 Location: oroville calif Posts: 892	Re: Voltage question Sponsored Links (Register now to hide all advertisements) it will work as long as its not connected to the dist side of coil, it can be hooked to the hot side side of coil, the negitive side, to be safe tho, the hot side wire must be hooked up so the pump is turned off when the key is turned off, if you hook the pump to the dist side wire it will cause misfires, robs electric power