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I have a 1990 F 250 7.3 diesel . Any help appreciated!!!!!
The fuel sensor on the front tank has not been working for over year. Just recently this truck has stopped running on me two times. I had it towed back to my home both times .One time I was driving and the other time the truck would not start after being parked for 4 hours at a fishing ramp. At home I started the truck by adding fuel & turning on the ignition switch , then pumping the accelerator about 10 times ,(WITH OUT TRYING TO START ENGINE )Repeated this procedure 3 times. I sprayed a shot of wd 40 in the air intake before starting the engine. Odds things are happening! I ran about 100 miles on the rear tank & when I decided to top it off with fuel ,This tank was full up to the neck ??? I am not dreaming!!!!!!!!
Any one knows what is going on ?????????<><>
Challe
Have you checked the fuse for the gauge? It also is the fues for the fuel selector switch.The selector valve is a good posibility, as some times they will draw from one tank and return it to another.
you definitely have a bad selector valve, and possibly something else going on too. replace the valve, then post back with whats happening if you still have a problem
When cold it is required to depress the throttle some to let the advance to be set. Of course no fast idle when warmed up.
Back to the orig question, it sure does seem that your selector valve is messed up. If the fuel was at the top of the neck, it also probably was leaking out and if you look there should be evidence of the fuel leaking on the area aaround and under the filler. When it would not start at the boat ramp, was it on an angle? Could be your return line cap O-rings are leaking air and the angle made it worse by draining fuel back more due to height difference.
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1988 F-250 4x4 7.3 5-speed ATS
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Thanks ALL you nice people.
I just sent a post but I was not logged in so I guess it did not go?
In the fuse box I can't find a listing of the fuse for the gauge ? i also checked the Manual listing of the link fuses.I plan to change the selector valve.Where is it located?
I changed two leaking fuel injectors today .My back yard mechanic friend says that I was getting air blockage , and this is the reason my truck stopped running ???I am going to get this tank problem behind me before I drive this truck !!...... .What do you all think ? Is my problem the tank or was it the leaking fuel injectors???
Challe
the leaking injectors were definately ONE problem, but having one tank overflowing proves that the selector valve is also a problem. it can be found inside the left frame rail a bit forward of the front tank. its a black plastic valve with 6 ports, of which two go to each tank, and two go forward to the engine. the two going each direction are (of course) supply and return, with different sizes for the two.
replacing it is pretty simple: disconnect fuel lines and wire harness, unbolt from frame, install opposite of removal. line position should be idiotproof, as IIRC the lines from one tank to to the top of the valve and have "L" fittings on their ends, while the other tank's lines mount to the rear of the valve and have straight fittings. you'll see/understand when you start taking it apart
Ok a side note for everyone sorry a little off topic though if your fuel line that crossed from driver side of the truck to the passenger side for the fuel supply to the engine make sure it stays tight to the frame (mine is loose and it rubbed a hole in it) and of course the engine was starved of fuel while driving it died at the light on me and wouldn't start
Thanks ALL you nice people.
I just sent a post but I was not logged in so I guess it did not go?
In the fuse box I can't find a listing of the fuse for the gauge ? i also checked the Manual listing of the link fuses.I plan to change the selector valve.Where is it located?
I changed two leaking fuel injectors today .My back yard mechanic friend says that I was getting air blockage , and this is the reason my truck stopped running ???I am going to get this tank problem behind me before I drive this truck !!...... .What do you all think ? Is my problem the tank or was it the leaking fuel injectors??? I sure appreciate all the posts<><>
Challe
It is the middle, 10 amp fuse in the second to the bottom row. Number 15. It is next to the power window circit breaker. You should hear a faint zipping sound from the selector valve when you switch from one tank to another. If your hearing is like mine, (not so good) you will need a helper. As stated the selector valve is in the drivers side frame rail at the front of the front tank. You can also feel the valve change if you have someone change the switch while you are under the truck. The key needs to be in the run position to change the valve from one tank to the other.
Back again
There were no fuse in the fuse box# 15 location?. (Must have dropped out) I installed a 10 amp fuse ,but still no read out on the front tank.Could this have been the problem with my selector valve. My hearing is not to good,but I will run the check that you suggested next week on the selector valve when I have some help.I think I will wait until i make this check before I change the valve.
I feel that we are getting close to solving this problem<><>
Thanks again for the info
Challe
If there was no fuse in the #15 position, the fuel selector valve would not switch tanks. Hopefull this will cure you problem. Did the rear gauge read correctly before you replaced the fuse?
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Dual tank problem 1990 F 250 7.3
Challe
