For what it's worth, I think some gasoline companies are upping the alcohol content in the gasoline fuels. Until recently I purchased Union 76 for my gas vehicles, my 60 HP Merc outboard and my lawn tractor.

This spring I started to have trouble with fuel delivery in all three. I also had black stuff in my filters. It turned out to be dissolved rubber from the fuel system The car is an 02 which should be resistant - not. The Merc motor was leaking gas out of the fuel pump - the gas ate through the pump diaphram.

I switched to Chevron after I fixed all three and have no evidence of any further damage.

My theory is it is cheaper for the refineries to blend in alcohol since they get more profit when they charge at the pump for 100% dino.

Also watch out for deterioration at the connections

I won't add to this thread anymore since its diesel and I don't want flak, but I thought it might be of benefit.