I'm having an issue with my boat. I ran it all day yesterday, no issues. Got gas today, and seems to have a fuel issue. It's a 4.3 carb, thunderbolt ignition 1997. It will not idle. Checked for power at the fuel pump, it gets power when cranking, but I think it may be losing power at idle. Is this how the system works? I'm thinking the oil switch that powers the fuel pump may be bad. But I'm not sure. thanks.