96-2000 Fuel gauge

[Lextech]

I don't know the answer to that one. I don't know if the 97 sender/pump module is different than the 98---I'm pretty sure it is. I know the 98 and up fuel gauge is a PWM deal that gets its info from the PCM.

Jeff

[RedHeartbeat]

yeah, the interchange of 97 and 98 sending units has fixed many fuel sending unit issues. The 97 allows you to feed the signal directly to the instrument panel instead of going through the PCM if I remember correctly. Never had to do this myself but a little research on here will lead you down the right path.

[LS1GMCTruck]

I had to research this when I was attempting to get my 1996 GMC fuel gauge working. The '96 & '97 are analog signals/gauges, via one sender wire directly from the sender/fuel pump module in the tank, to the firewall C-100 connector, and it works. 1998 & up are different. Make sure all your grounds are good. They are very important. All GM engine block grounds are solid black wire. All chassis ground wires are black with a white tracer, on the entire truck.

[LS1GMCTruck]

right but i have a donor fuel pump and sending unit from a 97 gmc sierra 5.7liter vortec because i had a 4.3 pump before and it wasnt enough, will your method work with a 97 sending unit and 97 fuel pump or just the 98?

The 4.3 fuel pump was'nt supplying enough fuel volume or pressure for your 5.3? Another little characteristic I discovered about our fuel pumps, is they won't deliver enough fuel, if you run the fuel tank level below 1/4 to 1/3 full. Always keep plenty of fuel in the tank. The pumps rely on the fuel for cooling. If the pump is'nt submerged, it overheats, shortening its lifespan, & burning up the pigtail wiring harness thats plugged into the top of the fuel pump along the way. This in turn burns up your fuel pump relay under the hood. My 4.3 fuel pump/sender module supplies sufficient fuel to my 5.7 LS1. Wondering why yours did'nt.