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Mark W.

fuel sending unit voltage

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:wacko:what shoud the voltage be for fuel sending unit. For a 19777 grand prix  sj. With a fuel sending relay 

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Mark

Sorry it took so long to answer your question. Actually, GM didn't use voltage between the fuel sending unit to the fuel gage. They relied on ohms (resistance) instead because electricity and fuel/fuel vapor are not good companions. GM used a reading of 0 - 90 ohms (zero ohms - empty - 90 ohms  full) from the mid-60s thru the 90s. Today's modern fuel level senders may go to 125 ohms, which shows the gate take a little past full. That's no big deal.

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