I need a diagram for a fuel tank selector valve; acdelco part # u7001

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.

Hello. That fuse is in one of two places; in the main fuse box on the driver side in the cab or on the left front inner fender. Good luck and keep me informed; if you want to.

The seal in the selector valve is bad on the front side.
Replace the valve or rebuild it.
Disconnect the battery ground cable before doing any work around gasoline.

in 1980 it is pretty much forward from fuel tank to fuel pump from fuel pump to carburetor ....the return line from pump to tank

hope it helps

There was a recall of sorts on the switching valve under the truck. You'll probably need to have it replaced. don-ohio

I am guessing that your truck is a Diesel. There is no electric fuel pump on the diesel models. The fuel filter light comes on when there is not enough fuel pressure. Possible problems include the selector vavle not fully switching, and/or an obstruction in the pick up in the front tank.

the selector valve is located underneath the truck on the inside of the frame rail on the drivers side If I remember right. Try swtiching to the front tank and tapping the selector valve assembly. If that clears up the light then the selector valve is sticking and needs to be repaired or replaced.

the fuel tank switch valve is bad. It is pumping fuel to the other tank instead of the engine. There was a recall for some models in 1989-91. I think you need a selector valve, just my guess.

here is some of what it says:

Your truck is equipped with a dual fuel tank selector valve which is designed to direct fuel to the engine from one fuel tank and returns unused fuel to the same tank. It is possible that the dual fuel tank selector valve on your truck could leak internally and as a result return a portion of the unused fuel to the tank other than from which it was drawn. Should this occur when the other tank is at full capacity, fuel could flow out the filler pipe of the tank past the cap. Fuel spillage in the presence of an ignition source, presents the potential for a vehicle fire.

need email address then send diagram also which motor 2wd or 4wd

Just in front of the side tank is the selector.Very common problem.The rear fuel tanks pump quits.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

There is no selector valve on a 1995 ford f150 300 engine. The selector switch on the dash sends power to the pump in the selected tank. The pump then sends fuel to the engine. If engine won't run on the selected switch, the pump in that tank needs replaced.