Power to fuel pump problems

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Nov 26, 2006 | 07:43 PM

ssamduran

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Joined: Jun 2006

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Power to fuel pump problems

<TABLE class="" style="MARGIN-TOP: 10px" cellSpacing=0 cellPadding=0 width="100%" border=0><TBODY><TR><TD class=table-left rowSpan=2></TD><TD class=bg-icon-question>Is there an in-line fuse on the frame rail to fuel pumps?

My vehicle is a 1990 F150 s-cab 5.0L V8 with dual in tanks. I am trying to figure out if there is an inline fuse because I found an open circuit in a wire behind the fuel tank selector switch. I fixed it and now the truck just cranks over, nothing more. So I then did a test on running the fuel pump continuously with the engine off by grounding the fuel pump on the DLC connector. This test also failed. I also checked the inertia switch it turned out to be fine. I grabbed a volt meter and checked for voltage at the fuel pumps. I got nothing there. I am out of ideas. Any opinions or ideas greatly appriciated.Thanks.

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Nov 26, 2006 | 08:12 PM

subford

Fleet Owner

Joined: Aug 2005

Posts: 23,667

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From: Easton,Ks

The only fusing for the fuel pumps is the fuse link at the starter solenoid.

Here is a diagram of you fuel electrical system.
http://i54.photobucket.com/albums/g9...el1990F150.jpg

Nov 26, 2006 | 08:17 PM

ChurchBuilder

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Joined: Sep 2006

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I just had the same problem. I replaced the fuel pump relay and now it works. When I grounded the test I heard the relay click but no power. It is the green relay under the hood.