Fuel pump inoperative

[SGT.BATGUANO]

You'd probabbly need a shop manual with vehicle specific wiring diagrams, but there is possibly a priming circuit and a "running" circuit.

Is the fuel GAUGE reading correctly?

[Triathlete]

You might also want to post this ???? over on the Isuzu board at the 4x4wire

[Moncha]

Along with posting at the Wire, you could look for fusible links..

[VehixDad]

I replaced 4 fuel pumps and a sending unit and found out it was simply the wire connector at the gas tank. This is the connector that splits to the fuel pump and gas gauge. I simply cut it out and direct wired to the tank. No problems for 5 years.

[mooncounter]

99 rhd jdm had no signal to fuel relays so i bypassed the system. From battery straight to fuel pump with a toggle switch on steering column.
Been working fine for 2 years and gives me a hidden fuel cutoff switch as well.