88 F250 Fuel Woes..
#1
88 F250 Fuel Woes..
I just got this truck and it has fuel issues. First of all it has 2 tanks. The smaller front tank leaks. When I put gas in the rear tank which seems to not leak it somehow makes it way to the front tank and leak out. My question is what are my options? Can I eliminate something to only use 1 tank? Im trying to do this as cost efficient as possible. Im going to need a front tank, where would be a good place to look for a platic tank? Any advice you guys can give me would be great. I did alot of searching and found some info but not much.
Thanks guys!
-Justin
Thanks guys!
-Justin
#2
You have a bad selector valve on the frame, it has shaft "O" rings in it that are stuck on the shaft.
Struck "O" ring:
http://i54.photobucket.com/albums/g91/subford/Fuel/DSC02400.jpg
Some 88 photos and diagrams.
Fuel System Diagrams for the 88 F series:
Electrical:
http://i54.photobucket.com/albums/g91/subford/Fuel/fuel-sel1987-89FSeries.gif
Mechanical
http://i54.photobucket.com/albums/g91/subford/Fuel/88Fuelsystem.gif
Selector Valve 1:
http://i54.photobucket.com/albums/g91/subford/Fuel/dfres.gif
Selector Valve 2:
http://i54.photobucket.com/albums/g91/subford/Fuel/FuelRes1.gif
Selector Valve 3:
http://i54.photobucket.com/albums/g91/subford/Fuel/FUELRES2.gif
Selector Valve 4:
http://i54.photobucket.com/albums/g91/subford/Fuel/Fuelselectorvalve.jpg
In Tank Fuel Pump:
http://i54.photobucket.com/albums/g91/subford/Fuel/1989FuelPump2.jpg
High Pressure Fuel Pump + Filter:
http://i54.photobucket.com/albums/g91/subford/Fuel/FuelPumpFilter88.jpg
Fuel Pressure Regulator:
http://i54.photobucket.com/albums/g91/subford/Fuel/fpr02.gif
Fuel Manifold:
http://i54.photobucket.com/albums/g91/subford/Fuel/Fuelmanifold.jpg
Fuel Pumps test ground at the Test Connector:
http://i54.photobucket.com/albums/g91/subford/Fuel/DataLinkConn.jpg
Inertia switch location 87-89:
http://i54.photobucket.com/albums/g91/subford/Fuel/1989InertiaSwLocation.gif
Struck "O" ring:
http://i54.photobucket.com/albums/g91/subford/Fuel/DSC02400.jpg
Some 88 photos and diagrams.
Fuel System Diagrams for the 88 F series:
Electrical:
http://i54.photobucket.com/albums/g91/subford/Fuel/fuel-sel1987-89FSeries.gif
Mechanical
http://i54.photobucket.com/albums/g91/subford/Fuel/88Fuelsystem.gif
Selector Valve 1:
http://i54.photobucket.com/albums/g91/subford/Fuel/dfres.gif
Selector Valve 2:
http://i54.photobucket.com/albums/g91/subford/Fuel/FuelRes1.gif
Selector Valve 3:
http://i54.photobucket.com/albums/g91/subford/Fuel/FUELRES2.gif
Selector Valve 4:
http://i54.photobucket.com/albums/g91/subford/Fuel/Fuelselectorvalve.jpg
In Tank Fuel Pump:
http://i54.photobucket.com/albums/g91/subford/Fuel/1989FuelPump2.jpg
High Pressure Fuel Pump + Filter:
http://i54.photobucket.com/albums/g91/subford/Fuel/FuelPumpFilter88.jpg
Fuel Pressure Regulator:
http://i54.photobucket.com/albums/g91/subford/Fuel/fpr02.gif
Fuel Manifold:
http://i54.photobucket.com/albums/g91/subford/Fuel/Fuelmanifold.jpg
Fuel Pumps test ground at the Test Connector:
http://i54.photobucket.com/albums/g91/subford/Fuel/DataLinkConn.jpg
Inertia switch location 87-89:
http://i54.photobucket.com/albums/g91/subford/Fuel/1989InertiaSwLocation.gif
Last edited by subford; 01-03-2007 at 08:33 PM.
#4
Originally Posted by gota0have0boost
Is this something I can fix, or is it something that just needs to be replaced? Are they expensive?
If you look at the first link above the bottom "O" is for the rear tank the top "O" ring is for the front tank.
As you can see the front "O" gets stuck on the shaft from non switching for a while and there is no way to free it without tearing the valve apart and most do not want to do that. I do not know where you can get a set of "O" rings to repair it.
You would have to special order it from your Ford guy as auto parts stores do have them. They are about $110.00 I think.
#6
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#8
#9
http://www.directfordparts.com is a sponsor of this forum and sells the selector valve for around $55.00 plus shipping.
F1UZ-9B263-B
The front tank should be larger than the rear tank by a couple gallons.
I had a problem like you describe on my 88. Some of the return fuel was being dumped back into the wrong tank. I purchased the selector valve and installed it but the problem didn't change. Ended up being a weak in tank pump. I know that doesn't seem logical but that's what cured my problem.
The only explanation I can think of is the valves in the selector valve weren't completely switching due to weak fuel pressure from the defective fuel pump.
F1UZ-9B263-B
The front tank should be larger than the rear tank by a couple gallons.
I had a problem like you describe on my 88. Some of the return fuel was being dumped back into the wrong tank. I purchased the selector valve and installed it but the problem didn't change. Ended up being a weak in tank pump. I know that doesn't seem logical but that's what cured my problem.
The only explanation I can think of is the valves in the selector valve weren't completely switching due to weak fuel pressure from the defective fuel pump.
Last edited by F150xlt; 01-04-2007 at 04:25 PM.
#10
Well 55 is much better that 110. Where is the valve located? Do I have to drop the rear tank to see it? I got under the truck tonight but couldnt find it. when I did some inspecting of the side gas tank I noticed the sending unit looks brand new. All gold and shiney, the complete opposite of the truck. It stuck out like a sore thumb.
#11
Click on the links provided and you'll see what the selector valve looks like.
It's black and round and mounted a little bit forward towards the middle of the inside driver side frame rail.
It has 4 input lines. 2 from each tank (an input from the in tank pump and the return line.) The front of the selector valve has a output that goes to the high pressure fuel pump mounted on the driveside frame rail and a line coming back which is the return line.
To remove the hoses, you pry up on the plastic clip half way and the hose should pull off. To reinstall the hose, push the clip back down and push the hose back on. If you break a clip, they sell them at Pep Boys and I think Autozone. **Note: There are two different size clips used.
As was mentioned. The selector valve is mechanical. The fuel pressure from the intank pump is what moves the valves inside the selector valve.
It's black and round and mounted a little bit forward towards the middle of the inside driver side frame rail.
It has 4 input lines. 2 from each tank (an input from the in tank pump and the return line.) The front of the selector valve has a output that goes to the high pressure fuel pump mounted on the driveside frame rail and a line coming back which is the return line.
To remove the hoses, you pry up on the plastic clip half way and the hose should pull off. To reinstall the hose, push the clip back down and push the hose back on. If you break a clip, they sell them at Pep Boys and I think Autozone. **Note: There are two different size clips used.
As was mentioned. The selector valve is mechanical. The fuel pressure from the intank pump is what moves the valves inside the selector valve.
Last edited by F150xlt; 01-04-2007 at 08:43 PM.
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