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Old 01-01-2010, 11:35 AM   #1
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Gas Guage

The gas guage in my 87 does not work (years) I will be replace the sending this spring should I replace ALL related parts pump, screen, etc. at the same time to head off any future problems?
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Old 01-01-2010, 05:00 PM   #2
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Originally Posted by ischua View Post
The gas guage in my 87 does not work (years) I will be replace the sending this spring should I replace ALL related parts pump, screen, etc. at the same time to head off any future problems?
Once that tank is dropped I would replace everything that can and will fail.

In fact that would be the perfect time to calibrate the sender unit as well.

Jim
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Old 01-01-2010, 06:36 PM   #3
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You would undoubtedly do it anyway - but you'll want to verify that the issue IS a failed sender, and not wiring or some other cause - as Jim stated, checking and adjusting (if possible) the calibration would be a good thing to do as well. Might be a good time to replace or at least verify the condition of the generator fuel line around the tank area as well, since they seem prone to leaks and related failures...
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Old 01-01-2010, 06:46 PM   #4
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Can you check the gauge and sending unit with out removing the tank? Thanks
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Old 01-02-2010, 11:14 AM   #5
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Can you check the gauge and sending unit with out removing the tank? Thanks
With a test meter in the resistance scale, if you can isolate the wires to the sender, and disconnect the fuel gauge, there should be a resistance displayed - dunno what specific range your unit uses - but lack of any resistance indicates a bad sender or open leads to the tank sender - if you can add fuel, or somehow move/shake the tank to cause movement of the fuel level, the indicated resistance displayed should also change. IF all that checks out as good, then your problem is elsewhere = possibly the fuel gauge itself...

All the sender unit is, is a resistance potentiometer similar to the volume control in a radio - the "shaft" of the potentiometer is fastened to an arm with a float on the end, as the float and arm raises and lowers with changing fuel level, the potentiometer resistance changes, and operates the fuel gauge...
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