Short of hooking up a new tank sending unit, is there any way to bench test a fuel gague to see if it is working?
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Re: Testing Fuel Gague
Disconnect supply line to sender from guage in dash. Make sure tank is almost empty. Connect LOW POWER ohmmeter (most hand held meters work off 1.5-9 VDC battery) across tank sender (between sender lead and ground). On MY/Shark cars, you can snake something like a coat hanger through the gas cap and loop around the float arm being VERY CAREFUL to be smoking/near heat source and exercise the float arm up/down. Ohmmeter should vary smoothly with motion in the 100 ohm range.
The same works in reverse with the gauge itself. Should be able to hook a 5 Watt wire-wound potentiometer onto the guage-sender lead setting the pot at max resistance. Connect the other lead of the pot to ground and vary resistance to see guage move. Need to be careful not to trim pot too low (toward zero ohm/short circuit position) to prevent excess current through the gauge.... -
Re: Testing Fuel Gague
Disconnect supply line to sender from guage in dash. Make sure tank is almost empty. Connect LOW POWER ohmmeter (most hand held meters work off 1.5-9 VDC battery) across tank sender (between sender lead and ground). On MY/Shark cars, you can snake something like a coat hanger through the gas cap and loop around the float arm being VERY CAREFUL to be smoking/near heat source and exercise the float arm up/down. Ohmmeter should vary smoothly with motion in the 100 ohm range.
The same works in reverse with the gauge itself. Should be able to hook a 5 Watt wire-wound potentiometer onto the guage-sender lead setting the pot at max resistance. Connect the other lead of the pot to ground and vary resistance to see guage move. Need to be careful not to trim pot too low (toward zero ohm/short circuit position) to prevent excess current through the gauge....Comment
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