I have a 96 evinrude 175hp, I have changed the priming bulb. When I launch and initially prime the fuel, it will run as long as I want too. Then stop and fish for say 30 - 45 min. maybe not even that long. When I try to take off again I have lost all prime, is that normal. I didn't know if it should be the fuel line or carbs. I don't see any fuel leaking anywhere