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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: bladerunner on June 29, 2014, 11:07:59 am

Title: Fuel Sending Unit
Post by: bladerunner on June 29, 2014, 11:07:59 am

So I have been having issues with my gas tanks for awhile and I finally decided to tackle all the issues. First up I had a passenger tank which I had never used because the tank won't switch over.  So I dropped that tank and upon looking inside decided to replace it. I have 2 new Spectra tanks with new locking rings. Right now I am looking at the sending unit from the passenger side tank to determine if it is good. Measuring off the ground and the electrical connection on the top of the unit, I am reading infinite.  I am able to get some resistance when measuring below on the underside of the sending unit, but it is inconsistent and certainly not in the 0-90 ohm range I am expecting. Guessing a bad unit?

(http://i872.photobucket.com/albums/ab289/bladerunner1337/WP_20140629_001.jpg) (http://s872.photobucket.com/user/bladerunner1337/media/WP_20140629_001.jpg.html)

(http://i872.photobucket.com/albums/ab289/bladerunner1337/WP_20140629_002.jpg) (http://s872.photobucket.com/user/bladerunner1337/media/WP_20140629_002.jpg.html)

(http://i872.photobucket.com/albums/ab289/bladerunner1337/WP_20140629_004.jpg) (http://s872.photobucket.com/user/bladerunner1337/media/WP_20140629_004.jpg.html)

Title: Re: Fuel Sending Unit
Post by: bd on June 29, 2014, 01:44:44 pm

The meter should indicate 0 Ω Empty and ~90 Ω Full when connected between the pin on the top of the sender and the sender frame.  If it doesn't, replace the sender.