I have an all original/original 1953 3800. My gas gage was working a few months ago and I just added 12 gallons and noticed the gage went only to 1/4. When driving home it came up briefly then dropped back down.

QUESTION -- do you think I have
1) a mechanical problem in the sender, OR
2) an electrical problem?

If you have seen this what did you do to correct it? What to check first?