Sounds like a body control module --in most newer cars there is a ecm for the elctronics for the motor and a bcm for all the interior dudadds --Check EVERY fuse in the truck and out under the hood -- look up the wire color codes for the ecm harness --check the power wire going to the ecm for 12v --or jump a wire off the batt + to that wire to feed it.try to locate all the grounds also--if need be google it --Like my ls1 trans am has a ton of ground wires --but there are 2 on the back of the head--if they are loose it will not run even tho all the other grounds under the hood are tight.I think they do that to isolate the ecm from ground back feeds or cross wireing when jump starting.
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did you replace the ECu with a used one or new. if it a used one did you match it to the old.why di you change the ECU.? when you turn the key in the start position does the fuel pump turn on? does it crank? do you know if there is spark if you pull one spark plug wire?
Fuel pump power starts at the ECM/Batt fuse in the underwood fuse block. From there it goes the the fuel pump relay and then to the fuel pump.
If you pull the fuel pump relay one pin should have power all the time. This is power from the ECM/BATT fuse. Two of the pins should be grounded. The last pin is power from the ECM. it hold have power for 3-5 seconds hen the key Is turned on and anytime the engine is cranking.
Find out what is going on at the relay and then we'll have a better idea of what direction to proceed.
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Certainly sounds like a bad fuel pump regulator. You have a 95 so the regulator isn't part of the fuel pump (on 96 and newer its all one assembly.) You don't have a fuel pressure tester by any chance do you? That would be a great tool in this situation. Here is a link to the item It is $60.00
have you checked to make sure the ecm has power to it? a quick way to tell is when you turn the key on, the service engine soon light should come on until you have started the vehicle. If it does not come on, you are not getting power to the ecm, which would cut power to the fuel pump, etc, etc
Will it try to start if you spray some carb cleaner in the throttle body? If so you need to check fuel pressure and if low, power to the fuel pump while cranking, the gauge not working could be a seperate issue. Could it be that the car is out of gas since the gauge doesn't work? Just asking. If so you may just need a sending unit. If you end up needing a fuel pump, you'll get a sender with it. I've never seen a sender and a pump go out at the exact same time, the use two different circuit's. The ECM really doesn't have any thing to do with the fuel gauge on this car.
Had the same problem with my '96 Silverado with 350 Vortec. The truck would only crank. It would start if fuel was poured down the throttle body. Could not hear the fuel pump hum. Fuse was good, but could not hear relay click. Relay was good, Did some electrical wiring trouble shooting. Turned out that one of the connectors that clasp onto one of the pins of the fuel pump relay wasn't making a good connection, too loose. I just stuck a peice of wire into the connector and pushed the relay back in. Relay clicked, Truck Started. It's been more than 4 yrs. since I made that McGuyver fix. Still firing.