Possible reason is open circuit. You can check it by testing continuity from fuel sender wire to ground at instrument cluster
connector. If it's open circuit sender is at fault and needs to be replaced. Not very hard to do.
My friend' 87 Westy had this problem
Leon
85 Subwagen Westy

Chris Findley wrote:

> My gas gauge no longer works, I think there is a short in it..does anybody have any pointers on how to fix this??..Let me know..
> Thanks Chris