It is bolted with 2 10mm bolts to the chasis underneathe the drivers side.
The only tank selector is in the switch on the dash. It transfer power to each tank to activate the electric fuel pumps for each tank
The fuel tank selector valve on a 1993 Ford F150 with a 4.9L engine is on the left side frame rail under the driver side floor pan forward of the side fuel tank in-line on the fuel lines. Follow the fuel lines from the side tank forward until you see the selector valve. The valve will have at least three fuel lines and one electric plug with wires plugged into it.
Underneath Driver side Cab as it meets the bed and it looks like this
when you have two tanks on your vehicle the fuel tank selector valve chooses what tank will send fuel to the engine. both tanks run into the valve
inside the in tank fuel pump.
You probably have a bad front tank fuel pump or you could have something wrong in the switch valve or selector switch, or even a problem in the wiring to the front fuel pump, but most likely a bad fuel pump.
35-45 psi
On the driver side frame rail just in front of truck bed.
The engines in a 1994 Ford F-150 are fuel injected so there is no carburetor
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Is there a rocker switch just to the right of the headlight switch ?
The traditional three port fuel selector valve is designed to allow the operator to switch between two fuel tanks, without having to switch the supply hose from one tank, to the other. Each of the two outboard, (outside) ports, go to your fuel tanks. The middle port is the outlet to your engine.
There isn't a carburetor , it's fuel injected