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Jan 22, 2015 | 02:58 PM

big_red1402

Thread Starter

5th Wheeling

Joined: Apr 2009

Posts: 25

Likes: 1

Could use a hand

Its been a while since I've been on here, but I'm having an issue you may be able to help me with. I got an 88 f150 rcsb 4x4 4 speed 302, a lot of miles, not exactly sure how many due to the old school odometers. Anyway, a while back out of nowhere the return fuel started flowing into the front tank, which was removed as part of the initial diagnoses because it was rusted away anyway. The switch valve on the frame rail was also removed at roughly the same time to eliminate this problem and force that fuel into the rear tank. About that time the fuel pressure regulator went bad. IT blew 3 of them there, and then finally one held for a while. It recently blew again and I have put 3 on and they don't even last more than roughly 10 miles before going out again. I've read several older posts with similar issues, but none that sound like mine. Any help is greatly appreciated.

Jan 22, 2015 | 07:34 PM

Eddiec1564

Cargo Master

Joined: Mar 2007

Posts: 2,935

Likes: 34

From: Arcadia, Fla

Check and make sure the fuel return line is not plugged up. Verify the fuel pressure is correct(around 40psi).

What did you use to bypass the fuel selector valve when it was removed?

Jan 23, 2015 | 05:08 PM

big_red1402

Thread Starter

5th Wheeling

Joined: Apr 2009

Posts: 25

Likes: 1

Quote:

Originally Posted by Eddiec1564

Check and make sure the fuel return line is not plugged up. Verify the fuel pressure is correct(around 40psi).

What did you use to bypass the fuel selector valve when it was removed?

When we removed the valve we replaced it with regular steel fuel line, no kinks, I took an air compressor with the last one and blew the return line out from the lines back, but it still blew the regulator. I'm not sure if the compressor actually got through the line, due to my blower nozzle not being the best. I'm considering just replacing the lines just to help diagnose, but no local shops have the line. Might try using a different nozzle to clear the lines tomorrow

Jan 23, 2015 | 07:40 PM

Eddiec1564

Cargo Master

Joined: Mar 2007

Posts: 2,935

Likes: 34

From: Arcadia, Fla

If you can, remove the fuel pressure reg and try blowing through the return line. There should be hardly any back pressure on the return line.

Jan 24, 2015 | 08:48 AM

'89F2urd

Lead Driver

Joined: May 2011

Posts: 5,798

Likes: 455

are you sure you have your lines connected correctly after deleting the selector valve?

prior to removing the selector, you had a bad check valve in your front tank. . .replacing that would have likely solved your problem.

now it seems you have new issues introduced to the mix...

Jan 24, 2015 | 09:04 AM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,789

Likes: 1,753

From: Kentucky

Quote:

Originally Posted by '89F2urd

A 1988 truck does not have check valves in each tank like the 1990 and newer trucks. The dual function reservoir provides that function. That device is also referred to as "selector valve".