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Engine Stalling

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dannywadd

New member
Engine is a 1997 mercruiser 5.7l 350 with a mechanical fuel pump. I have been chasing this problem with my boat all summer. Boat runs and idles real good for about 45 minutes or so then starts stalling out. When trying to start it back up it sounds like it's starving for fuel. After awhile of cranking it, pumping the throttle, and cranking it at WOT it eventually starts back up. It has stalled while I was just sitting there floating with the engine running, when I have gone to give it more gas at a cruising speed, and when I have been going through no wake zone. I have replaced the coil, all spark plugs, bought a refurbished 2 bbl carb, just recently had the anti-siphon valve changed out, and have changed out the fuel/water separator filter.
 
so today was my only day off and it’s not very nice out so i tried running my boat in the driveway. i ran it for about 45 minutes with the gas cap on before it stalled out. it took a lot of pumping and had to start it at wide open throttle to get the fuel through then ran for about another 15 and it did it again. took the gas cap off and it ran for about 50 minutes then stalled.went to start it up and it only took two throttle pumps to start it up. it then ran for about 30 minutes then stalled out
 
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