I had similar issue with my 1994 Mariah, is it worse with a full tank? My problem ended up being the seal had went bad between sender and tank, also regular silicone won’t hold up to gas need to make sure your gasket maker is up to par
So apparently my trim pump went out on my 94 Mariah With a Yamaha sterndrive 5.0. I was wondering what the options are as far as using a MerCruiser part or any other generic trim pump