Re: Dad's 5677A

Posted by HH56 On 2020/11/4 12:00:08
If you are going to paint the tank or use an old sender do yourself some favors before reinstalling it and the tank.

First is check the sender with an ohmmeter connected between the mounting flange and terminal to ensure it is good and the value is correct at approx 73 ohms empty and 10 full. Be sure the numbers are changing SMOOTHLY as you move the float from empty to full and back to empty. If they reach a point where the numbers suddenly change direction or drop completely and then resume the previous value and continue the change, the support the resistance wire is wound on could be warped and letting the wiper lose contact. Erratic numbers results in a jumpy gauge and sometimes a non functioning gauge if there is a spot that loses contact completely.

If the sender is good make sure there is no paint on the area where the sender mounts and on the tank where it touches the body. After a tank has been removed, worked on and reinstalled many have found ground issues so needed to drill a small hole in the excess metal at the center weld flange at one of the corners to attach a small ground wire connecting the tank to the frame or body.

If you are not a purist it might also be to your advantage to cut a hole in the trunk floor before reinstalling the tank so you can access the sender. That way the tank does not need to be removed again should you need to replace or do more work on the sender. The hole can be covered with a plate and the mat will hide it from view so only you would know it is present.

If you are interested in a hole, here are some dimensions Ross provided. I believe this hole was cut on a 51-4 body but the dimensions should be very close to those needed on a 55-6 body. You might want to verify though.

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