78 Ski Nautique shoots gas out the vent of carb
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=43028
Printed Date: October-06-2024 at 2:21pm
Topic: 78 Ski Nautique shoots gas out the vent of carb
Posted By: menaumann
Subject: 78 Ski Nautique shoots gas out the vent of carb
Date Posted: June-24-2018 at 3:59pm
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I have a 78 Ski Nautique. Ran fine last year when I put it away. Went to start it this year and the water pump was leaking and the vent in the carburetor was shooting fuel straight up. Replaced the water pump. Tried tapping on the carb with a rubber mallet in case the float was stuck. Didn't help, rebuilt the carb and put it back on, same problem, rebuilt it again just to make sure, same problem, put different floats in, same problem. The floats seem to be working correctly because when you pull the screws on the side the fuel is at the correct level. Finally ordered a brand new carb and put it on. Exact same problem. No idea what to do next? Engine is Ford PRD WR R10 and Carb is a 4 barrel Holley.
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Replies:
Posted By: Jonny Quest
Date Posted: June-24-2018 at 4:07pm
Put a fuel pressure gauge on the fuel line coming out of the fuel pump. You should be about 6 psi. Significantly higher will cause the fuel to flow past the float bowl needle / seat and run down into the carb throat.
JQ
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Current
2003 Ski Nautique 206 Limited
Previous
2001 Ski Nautique Open Bow
1994 Ski Nautique Open Bow
Aqua skiing, ergo sum
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Posted By: andrewmarani
Date Posted: July-01-2018 at 5:52pm
Doesn't the clear fuel pump bypass line run to the spark arrestor on top of the carb, so when the fuel pump diaphragm fails it pumps fuel into the carburetor and stalls out the boat. I think it's a safety feature so the pump doesn't dump fuel into the bilge.
Sounds like you have a different issue, but thought i would mention this just in case, since it would also put fuel into the carb in a weird location.
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Builder
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