I have a 1996 F-350 with dual tanks. The truck ran on either tank until about a month ago. Then one day I was running on the front tank and it would not run. I checked the gas and the pump and all was good. Then I tried it a few times and it started working again. Then about a week later I switched to the front tank and it would not run on it. I replaced the relay and it did the same thing. Now I find that if I move the switch on the dash while the truck is running on the rear tank the fuel gauge goes way past full and if I turn the truck off and move the switch to front tank when I turn the key on it will go to empty. It seems like it will sometimes run for awhile on the front tank but then shut off and sometimes it will do the same on the rear. Any answers!
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The black reservoir/fuel tank selector unit you are referring to is the fuel tank switching valve, which is designed to switch between the two fuel tanks in your 1988 Ford Ranger XLT 4X4. This valve is responsible for directing fuel from the selected tank to the fuel pump and engine.
The second fuel tank selector unit you mentioned (part number 5sv2k) is likely a replacement part for the original fuel tank selector unit. It is not intended to replace the fuel tank switching valve.
The dual fuel tank system in your Ford Ranger requires both the fuel tank switching valve and the fuel tank selector unit to function properly. The fuel tank selector unit allows the driver to switch between the two fuel tanks, while the fuel tank switching valve directs fuel from the selected tank to the fuel pump and engine.
If the black fuel tank switching valve is leaking or malfunctioning, it should be replaced to ensure proper operation of your dual fuel tank system.
The only way to know for sure is to hook a gauge to the rail and check the fuel pressure when it won't start. Sitting for a few minutes and restarting is normally a sign of a relay or coil cooling off. There should be a EEC relay that powers the dist module and ECM. I know you said you have spark, but it could be something else related. Also, if you have spark at the right time and no fuel pressure, you should be able to use starting fluid to substitute. I don't suppose you have dual tanks and the switching valve is the problem ?
If you hadn't used the passenger tank before, it may have had crud in that tank which got pulled into the main fuel line, I would check the fuel filter on the frame and I would check the fuel filter at or near the carb. If it runs by priming it then you need to trace the fuel line back towards the fuel tanks, it could even be the selector switch for the tanks went bad if it's electrical.
From what I can find out Ford did not use a fuel transfer valve in 1992. They ran both pumps to a common fuel line and used one way check valves to keep one pump from filling the other tank while keeping the entire fuel system pressurized. Your tank selector switch is actually switching pumps off and on, not a transfer valve. The problem Ford had was the one way valves failing causing one of the tanks to overflow. They have an external one way valve kit to solve this problem, but the valves are about $85.00 each.
Try running a Can or two of B12 Chemtool through the Fuel system with a Full tank of gas. 1 can per tank. Usually works for me. This will clean the Injectors, Jets, Valves, and ANY Carbon buildup anywhere in there.
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