Fuel pump i got a 92 ford ranger xlt with a 2.3l in it and when you turn the key the fuel pump wont come on. ive replacer my sending unit and changed the fuse in power ditribution box and it worked for about 2 weeks like it was brand new. now the fuel pump wont come back on when you turn the key unless you turn the key off, pop the hood, and tap on the power ditribution box then get back in the truck turn the key and it will start cant figure out what the problem is any ideas???? thanks P.S. ITS IN MY TANK

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.

Could be problem with ground maybe they both are using same ground wire and it is loose or broken somewhere.

In some applications, yes there is two.


On the 2.3L and the 2.9L engines to model year 1988 the electric fuel pump system used on these EFI engines consisted of two fuel pumps: a low pressure boost pump mounted in the fuel tank, and a high pressure fuel pump mounted on the frame rail.
The low pressure electric fuel pump is located in the fuel tank and is a part of the fuel gauge sending unit.

check the fuel pump and see is working properly, if the pump is good than the problems will be the crank sensor is faulty. what crank sensor does it sense the turning of the flywheel and it send a single to ecu, and ecu send a flow of power to turn on the fuel pump as long it sense the flywheel turning.

You could have a slight vaccum leak that is preventing the fuel pressure regulator to operate correctly.

You fuel pump could be on the way out as well

You could have a crack in a fuel line

Have you changed your fuel filter?

Could be a couple of things, start there and see where it gets you.

check your fuel pressure, also check to see if there is a booster pump, some ford rangers have a booster pump inline... fuel injected units need to have at least 35-45 psi some even higher around 50 psi...

bad ground wire? worst case you can run your own swicth to the pump but this woud be run off the ignition so the key must be on . is it in your tank or exturnal on the frame of the truck?

either a bad body ground,or your tranny is locked up,did it run good before you shut it off?