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72 FUEL GAUGE WITH 76 TANK — CORRECTION?


smrc-8081

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have a '72 240Z with a Rebello engine, TWM EFI/etc, and a '76 fuel tank and pump. But the fuel gauge (not unexpectedly) doesn't show accurate fuel levels. That is the gauge indicates less fuel than actual, and never points higher than about 3/4 with an actual full tank of gas. Short of replacing the gauge with a '76, might there be an electrical component I could install to correct the signal sent from the sender unit to the gauge?

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Have you cleaned all of the connecters between the fuel gauge and fuel sending unit? Corrosion will show up as extra resistance. Extra resistance means lower readings.

Makes sense. Almost certain there is no corrosion as I remember the connectors being very clean and this is a CA/UT car, but worth checking. Thanks.
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Trust me. Corrosion can happen even with a "California" car. The horns on my 240Z wouldn't work until I took a dremel and wire brush to the horns and the wiring. That's a little more extreme because the horns are out front and get spray, but I have found corrosion at many connectors.

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I have a '72 240Z with a Rebello engine, TWM EFI/etc, and a '76 fuel tank and pump. But the fuel gauge (not unexpectedly) doesn't show accurate fuel levels. That is the gauge indicates less fuel than actual, and never points higher than about 3/4 with an actual full tank of gas. Short of replacing the gauge with a '76, might there be an electrical component I could install to correct the signal sent from the sender unit to the gauge?
Once you corroborate that all the electrical sources of failure check out, you can also pull the sender from the tank, bend the floater arm downward about an inch (toward the bottom of the fuel tank) and reinsert in the tank. That should allow your fuel gauge needle to move to the right with the same amount of fuel in the tank. It will take some experimentation but you should be able eventually to get the gauge needle to go fully to the right with a full tank of gas.

Sent from my SM-N986U using Tapatalk

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