How to test fuel tank sending unit?
September 5th, 2016, 07:00 AM
#1
Chris
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Join Date: Jul 2011
Location: Southern New Jersey
Posts: 1,284
How to test fuel tank sending unit?
I am not very well-versed in electrical matters. Can anyone explain how to test a fuel tank sending unit from my 72 cutlass so I can determine if it works before I install it in the tank? I do have a multi-meter, just not exactly sure how to go about testing it. Thanks!
September 5th, 2016, 09:54 AM
#2
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September 5th, 2016, 09:56 AM
#3
Lansing built
Join Date: Nov 2011
Location: Grand Ledge, MI
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Most sending units have a center post and possible ground tab.
Hook your meter to the center post and tab, if no ground tab then clamp to the mounting flange. Set your meter to low range ohms and move the arm up and down and you should see a varied resistance through out the range of travel except may the last area of empty or down.
Pat
Hook your meter to the center post and tab, if no ground tab then clamp to the mounting flange. Set your meter to low range ohms and move the arm up and down and you should see a varied resistance through out the range of travel except may the last area of empty or down.
Pat
September 5th, 2016, 06:04 PM
#5
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Location: central Indiana
Posts: 5,237
GM sending units are 0-90 ohms. The lower the resistance, the lower the gauge reads if the wire between the tank and gauge is open, it will read beyond full. If the wire is grounded, it will read empty.
July 27th, 2017, 03:57 PM
#9
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July 27th, 2017, 06:58 PM
#11
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