1997 GMC Sierra



July, 17, 2010 AT 10:21 AM

1997 GMC Sierra V8 Four Wheel Drive Automatic 150000 miles


Put in a new fuel pump assembly and wound up with the tube on the right having nothing to connect to. Truck starts and idles fine, but fuel gauge goes to way past Full mark. Are these related?

It's been so long since I took out the old fuel pump I don't remember if this tube was connected to anything on the old pump. I've searched everywhere!

1 Answer



July, 17, 2010 AT 11:49 AM

The fuel gauge gets its signal from a float inside of the tank which (basically) sends a voltage to the ECM or fuel gauge.

The tube in the picture (I believe) is the vapor tube line that is supposed to go to the fuel vapor canister (or charcoal canister) located in the engine compartment. A fuel line (or hose) should run all the way from the canister to this tube.

This tube should have nothing to do with the fuel gauge issues.

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