#1 Fuel Pump problem?

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Apr 28, 2010 | 04:58 PM

blue92f150

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#1 Fuel Pump problem?

I have a 92 and it refuses to run off the front tank. Runs fine off the rear tank, but not the front. Funny thing is that I can "hear" the front tank fuel pump priming the fuel system (whirring sound, just like the sound from the rear tank pump) before I attempt to start, so the front tank fuel pump "appears" to be somewhat functional.

So, question is what ELSE could possibly be the problem (assuming the front tank pump is fine) causing the truck to not run when switched to the front tank? Could something be clogged between the front pump and the engine?

Thoughts?

Thanks. Jim B.

Apr 28, 2010 | 05:19 PM

subford

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From: Easton,Ks

The only two things it could be is a pinched fuel line from the top of the tank to the "T" on the frame or a plugged up sock on the bottom of the pump.

But I will vote for a bad pump.

Apr 28, 2010 | 05:59 PM

blue92f150

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Bad Pump?

How can the pump be "bad" but still make the whirring sound?

Jim B.

Apr 28, 2010 | 06:11 PM

blue92f150

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BTW...

What is the name of the hard fuel lines that form the "T" near the mid-tank? The one line (of the three hard lines there held in by the white plastic clip) is rusty and pretty bad too. The two hard fuel lines right against the frame are OK, it's the third hard line (furthest from the frame) that's going bad. So, what is carried by that third line?

Thanks again...

Jim B.

Apr 28, 2010 | 09:10 PM

subford

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From: Easton,Ks

Quote:

Originally Posted by blue92f150

So, what is carried by that third line?

Brake fluid to the rear wheels?

Apr 29, 2010 | 04:03 PM

blue92f150

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Nope...

The third line is definitely fuel related. Perhaps it's the vent for the two tanks? One end of this rusty line appears to go to a plastic T, one end of which goes to the top of the mid-tank. Check out the pics...

Jim B.

Apr 29, 2010 | 04:17 PM

subford

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From: Easton,Ks

OK the 1992 vapor line is on the drivers side until it gets to the front tank and then it goes to the other side. Other years it was on the the other side of the truck all the way.