1997 GMC Sierra fuel pump

1997 GMC SIERRA
150,000 MILES • V8 • 4WD • AUTOMATIC
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PD444
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  • 1 POST
[img:4515306747]http://www.2carpros.com/forum/automotive_pictures/551200_DSC06628_1.jpg[/img:4515306747]


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!
Jul 17, 2010 at 3:21 AM
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PEAR69
  • ✓Experienced Mechanic
  • 1,482 POSTS
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..
Jul 17, 2010 at 4:49 AM
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