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Hi Folks:
A member of my Ford club picked up a 67 standard Cougar that had been in storage for 20+ years. The gas tank was rusted so he replaced it (16 gal), a new sender, and screws around the perimeter. Throws in 4 gals of gas and the gauge barely leaves empty. So I (being younger) crawl under the back and ground the gauge wire to the sender pipe and the gauge goes to full.
Next I take the old rusted sender and get the arm moving and hook it up under the car. Every position I move it to the gauge responds correctly. So bad new gauge. He buys another from a different vendor (different manuf.) and we hook it up under the car and it reports correctly to the different positions.
Drain the tank and replace the new sender this time I made sure he had it aligned properly so the float would be level. Hook it up and 4 gals of gas and the same position, barely off empty. Added 4 more gals and it moved between empty and 1/4. Hook the removed sender up under the car and the gauge works fine.
Another club member decides the instrument regulator is bad so he takes the dash out and changes it, no difference.
We even ran a wire from the sender tube to the battery negative and no change. This circuit is so simple but we're baffled.
Has anyone had this problem or more ideas?
Thanks
Jim
A member of my Ford club picked up a 67 standard Cougar that had been in storage for 20+ years. The gas tank was rusted so he replaced it (16 gal), a new sender, and screws around the perimeter. Throws in 4 gals of gas and the gauge barely leaves empty. So I (being younger) crawl under the back and ground the gauge wire to the sender pipe and the gauge goes to full.
Next I take the old rusted sender and get the arm moving and hook it up under the car. Every position I move it to the gauge responds correctly. So bad new gauge. He buys another from a different vendor (different manuf.) and we hook it up under the car and it reports correctly to the different positions.
Drain the tank and replace the new sender this time I made sure he had it aligned properly so the float would be level. Hook it up and 4 gals of gas and the same position, barely off empty. Added 4 more gals and it moved between empty and 1/4. Hook the removed sender up under the car and the gauge works fine.
Another club member decides the instrument regulator is bad so he takes the dash out and changes it, no difference.
We even ran a wire from the sender tube to the battery negative and no change. This circuit is so simple but we're baffled.
Has anyone had this problem or more ideas?
Thanks
Jim