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Old 06-05-2008, 11:15 PM
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51 Pontiac fuel sending unit

Okay, I just finished bagging a 51 Pontiac Chieftain to lay out on the frame & I had to mount a fuel cell in the trunk, the stock tank would have drug on the ground. I used a Summit 15 gallon fuel cell with the 0 ohms empty, 90 ohms full sending unit. The problem I'm having is the stock sending unit is for a 6 volt system & the new sending unit is for a 12 volt system & reads full all the time. The car has been converted to 12 volts, I don't know how it was done 6 volt systems are before my time. Does anybody know how to make this sending unit work with the stock gauge, or of a sending unit that will work in this tank with the stock gauge?

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Old 06-06-2008, 11:58 AM
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the gauge needs a 6v resistor and you need a sending unit that has the correct ohmerage.
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Old 06-06-2008, 12:06 PM
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Well I've found a 0 - 30 Ohm sending unit for the foam style fuel cells ( $150 ), I was told the voltage does not affect the operation of the sending unit. I will have to order the sender & see what happens I guess.
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Old 06-06-2008, 12:28 PM
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voltage dosent effect the sender itself, it will always provide the same ohmerage.. but the gauge is a volt meter. the voltage going into the sender used to be 6 volt. and full would be 0 ohm and it would read full. if you take 30 ohm of resistance out of 6v you will have less than 6v so it will read empty. so if your pushing 12v thru the sender and gauge, chances are it will still read 6v at the gauge and therefor, full
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Old 06-06-2008, 05:02 PM
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The gas gauge was working fine till I installed the fuel cell. I'm gonna take the sender out of the original tank to see exactly what the Ohm readings are at full & empty & I should be able to know to go from there.
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Old 06-06-2008, 05:25 PM
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I have a '53 edition Motors manual and looked up the fuel gauge/ sender operation for an A/C Delco unit. they give simple tests to diagnose a problem but no listing for the ohmerage. It seems 0-30 is the correct ohmerage for the gauge but I could be wrong
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