1993 fuel pump problem

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Feb 12, 2022 | 08:03 PM

bailey teague

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1993 fuel pump problem

I just replaced the rear fuel pump on my 1993 f150 and it still doesn’t work so I drove it a little while using the front fuel tank and I came to find out while I was driving it was also pulling fuel from the front tank to the rear tank so it quickly ran the front tank out of gas and idk why

Feb 12, 2022 | 08:50 PM

wwhite

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Did you replace the whole assembly, or just the pump?
The assembly has the valve that stops fuel being pumped into the tank.

That valve is not working, and is why fuel pumps from front into rear.

Feb 12, 2022 | 08:53 PM

bailey teague

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Quote:

Originally Posted by wwhite

Did you replace the whole assembly, or just the pump?
The assembly has the valve that stops fuel being pumped into the tank.

That valve is not working, and is why fuel pumps from front into rear.

I’ll just replace the rear pump but it’s interesting that this just started happening after I replaced the rear pump

Feb 13, 2022 | 02:22 AM

4.9brick

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If fuel is returning to your rear tank while running off the front that means the check valve in your rear pump is bad. The valve is not in the hanger. I had the same issue (fuel returning to the rear) and replaced just the pump, I kept the original hanger and sending unit. This fixed the problem for me. It sounds like you received a bad replacement pump.

Feb 13, 2022 | 08:32 AM

subford

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From: Easton,Ks

You have a bad valve in the rear module.
Never replace just the pump.
Always by at least the module if not the whole assemble (hanger, sender & module).

The Module.
Attachment 278661

/

Feb 13, 2022 | 08:41 AM

bailey teague

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[QUOTE=subford;20286565]You have a bad valve in the rear module.
Never replace just the pump.
Always by at least the module if not the whole assemble (hanger, sender & module).

The Module.
Name: l5OeA4R.png
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Size: 16.5 KB

Name: l5OeA4R.png
Views: 1438
Size: 16.5 KB

/[/QUOTE. So should I disconnect the wires from the rear pump since it is supposedly bad or should I Replace the auxiliary tank valve

Feb 13, 2022 | 08:44 AM

My4Fordtrucks

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Quote:

Originally Posted by wwhite

Did you replace the whole assembly, or just the pump?
The assembly has the valve that stops fuel being pumped into the tank.

That valve is not working, and is why fuel pumps from front into rear.

Quote:

Originally Posted by bailey teague

I’ll just replace the rear pump but it’s interesting that this just started happening after I replaced the rear pump

In my mind you still haven’t answered whether you replaced only the pump or the whole pumps module assembly.