Outboard troubleshooting. I have a 75 hp Mercury with 2 carbuerators. Serial # 6559142 it's around a 1989 model.. Problem= tank bubble pumps up tight...sits for a minute and gets soft...when I pump it up again tight engine starts and runs good until carburator runs out of gas. Bubble is still tight..let sit for another minute and bubble gets soft .this repeats several times. Engine will start up and run until carburator runs out of gas again. It's like something is restricting gas getting to carburator. Engine has been setting for a few years but gas was always run out of it after running.i have checked from where bubble connects to engine and gas flows thru the connecting tube to engine. There are no fuel leaks. Engine revs and runs good til gas runs out in carburator.

Chris Phillips

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