Elec fuel pump

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Nov 19, 2010 | 04:11 PM

ro.walker

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Elec fuel pump

<HR style="BACKGROUND-COLOR: #d1d1e1; COLOR: #d1d1e1" SIZE=1 itxtvisited="1">
I have an 89 F-150 4X4, with a 5.0. I have a problem with the fuel pump continuing to run after the key is turned off. It does this occassionaly but not all the time. There are no leaks in the fuel system. Is there a switch that tells the fuel pump to run or is this some type of failure in the pump. The only way to stop it from running is to disconnect the battery, Would it be acceptable to install a toggle switch to use to cut the power to the pump.

Thanks

Nov 19, 2010 | 04:20 PM

rla2005

Fleet Owner

Joined: Oct 2005

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From: Kentucky

I would suspect your Fuel Pump Relay is sticking closed.

Electric Diagram from Ford Fuel Injection:

Physical location courtesy of Subford:

Nov 19, 2010 | 04:20 PM

oleman

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Joined: Nov 2010

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The fuel pump is driven by a relay. It probably has sticking contacts.
Replace it and see if it helps.

Nov 19, 2010 | 04:29 PM

ro.walker

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Thanks, I expect you guys are exactly right. will get me a new one and try it.

Nov 19, 2010 | 06:15 PM

ro.walker

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Just bought one and put it on, I have my fingers crossed , everything is OK right this minute. The picture is not the same as my truck but it put me on the right track, I did find it. Thanks a lot.