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Boat starts and runs then dies |
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gun-driver 
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Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4127 |
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 Topic: Boat starts and runs then diesPosted: July-04-2018 at 11:17am |
What fuel system is on your GT-40? If it's the one without the fuel canister your HP pump is on the way out. |
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srh63
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Joined: July-01-2018 Location: Lubbock Tx Status: Offline Points: 3 |
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Posted: July-04-2018 at 12:39am |
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Thanks I think it's the low pressure pump.
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tryathlete
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Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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Posted: July-04-2018 at 12:32am |
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Your problem sounds like a slowly dying low pressure fuel pump. For better advice you need to consult the infamous Poor Man’s GT40 troubleshooting guide
Poor Man’s GT 40 troubleshooting guide |
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andrewmarani
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Joined: May-31-2005 Location: Baltimore, MD Status: Offline Points: 248 |
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Posted: July-03-2018 at 6:30pm |
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I see no one has weighed in. I have a ford 351, so different motor but I did have a similar issue. After we had been skiing for a while, the engine would start sounding rough at idle while we were setting up for the next pull. Sometimes it would stall out and would be hard to start. I traced the issue to the carburetor gasket after research on this forum.
Sometimes, when the engine is hot and you have a thin (read standard) gasket between the carburetor and the engine, too much heat can transfer from the engine into the carb and it causes issues. The heat can also cause an air leak between the carb and the engine through the gasket. The solution is to buy a thicker gasket to go between the carb and the engine. The one I bought is roughly 1/4" thick from Discount Inboard Marine. Not sure if I had an air leak or some other heat related issue, but the problem went away. Welcome to the forum. |
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srh63
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Joined: July-01-2018 Location: Lubbock Tx Status: Offline Points: 3 |
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Posted: July-01-2018 at 5:18pm |
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After sitting for 15 minutes or so it starts up runs for about 5 or so. Then dies so like it's running out of fuel. Try cranking no start let it set 10 minutes or so and will start on a 1996 GT 40 with 400 hrs. Runs great besides this problem.
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srh63 wrote: