New Fuel Sending Unit

[BroncoRay]

Just recently replaced the fuel sending unit - the gage worked perfectly on the first fill-up (showed Full). after about fifty miles the gage showed less than 3/4, after 120 miles it showed less than 1/4. Filled up just to make sure - took less than 10 gal. on the 23 gal tank.

Pulled the sending unit again to check for obstructions on the float arm - works freely. The sending unit only goes in the tank one way - the two tabs on the side ensure this. Have now filled up again twice - it now never goes to full on the gage.

Any thoughts.

 

[Seabronc]

Probably bad connections. The readings are based on circuit resistance. Check the contacts inside the connector for corrosion and also tightness. I'd run a separate ground to the black wire. Check the connector in the engine compartment near the left side fire wall also.

Good luck,

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