I just bought a 1986 ford f250. My uncle hacked up the diesel fuel routing. Now I'm having trouble getting fuel. I want to re route everything correctly, the way it was from the factory. He claimed that the selector valve was malfunctioning, sending all return fuel to the rear tank. He then installed some cheap valve that has given him nothing but problems, yet he is stubborn enough to think that is not the problem. I installed a new mechanical fuel pump before my cousin lent me a mighty vac. With the mighty vac we found out that fuel wasn't making it past the cheap valve. Now i was hoping someone has a diagram, a pic or even an idea about how the fuel lines are routed. also i read online that the fuel tank selector valve can be rebuilt with a few new o-rings and drilling the old rivets. If not does anyone know how to differentiate between the fuel selector valves at the auto parts store. I'm pretty sure that the supply line is 3/8'' and the return line is 5/16''. I have six feet of both. I switch between tanks right next to my ac controls, i think the selector valve is electrical, there are some wires hanging near(2). and the selector valve that is mounted to the frame doesn't have a reservoir. I've read places that my 1986 diesel f250 has a dual function reservoir. I got under and looked but could only find what looks to be a fuel tank selector valve. I'm pretty sure that the fuel is reaching the cheap valve because when I move the valve it leaks fuel.
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