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Make sure the ground is good, that truck was known for a bad connector near the Trannie cross member. Find your plug at fuel pump,4 wires..2 black, gray and purple. Black and purple are for the float. Gray is power to pump, black with yellow is ground for pump. When key is turned grey wire gets power check good ground . If power and grounds are good replace pump if not fix ground or replace relay
If you unplug the connector for the pump, you should have battery voltage on the pump circuit from the relay for 3 seconds. You would have 5 or 6 volts for the gauge sending unit. You should be able to jumper the pump relay and get 12 volts at the pump connector.
There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse. You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump. If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse. That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.
Can you hear the pump running? If not why not check for power to the pump on the grey wire. Get as close to the pump as possible. If there is power you just confirmed the fuse, relay, and wiring are all good.
The relay is located on the firewall behind the plastic cover that usually has something like electrical center written on it.
Underhood fuse block swap out relay #7 thats the ECM relay. Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location. Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo
I would have to check the fuel pump with a scope to look at the pattern and check the amps it is drawing . the grounds need to be checked and the pcm checked and reflashed. on the fuel system that would affect the fuel pump and relay to where it would burn it out is grounds , pcm , fuel pump , fuel pump relay. so you should convince them to replace the fuel pump and fuel pump relay under warranty and replace the pcm . and get a diagram and check all grounds. If the pcm is damaged and the current has been affected and instead of say a 5 volt or 2 volt signal it now has a 13.5 volt signal or if a ground is out then the temp of the relay will keep rising non energized a relay is about 99 energized it is around 140 you can check to see how hot that relay is getting. and if i remember correctly you want the pcm drivers checked.