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Gas leak at carb connection |
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andrewmarani 
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Joined: May-31-2005 Location: Baltimore, MD Status: Offline Points: 249 |
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 Topic: Gas leak at carb connectionPosted: August-16-2024 at 9:02am |
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Started up my boat last night after 2 years of renovations. Engine ran well but there is a small leak at the gas line connection to the carburetor. At first it was a very slow drip so using two wrenches I tightened up both the larger nut at the carburetor and then the smaller nut that snugged up the gas line.
Not dripping now but still gets wet around the threads. I've had this issue before years ago and am leary of over tightening the two nuts. Can I take this apart and apply some teflon tape? Or is there some other technique to stop the leak? Thanks Andrew  |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21186 |
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Posted: August-16-2024 at 11:35am |
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Neither connection uses the threads to seal so teflon tape or any other type of thread sealer would be counterproductive.
The larger nut that threads onto the bowl uses a face seal- confirm that it is present and in good condition. Replace if not. Then check the mating surfaces (both sides) on the inverted flare connection. Any burrs or debris will compromise the connection. Other than that, it’s just tightening both appropriately and sufficiently. Tighten the outer (larger) nut to the bowl first, then hold it in place while tightening the inverted flare nut to it. Both need to be pretty tight to prevent leaks, but especially the inverted flare connection. A good set of wrenches- a thin 1”, and a 5/8” fuel line wrench- go a long ways. |
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andrewmarani
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Joined: May-31-2005 Location: Baltimore, MD Status: Offline Points: 249 |
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Posted: August-16-2024 at 11:51am |
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Cool. i've got the right wrenches so no issues with damage to the nut or being able to apply force. Applying too much force was a concern. I know the thin washer is in place between the carb and the larger nut.
I will pull apart and confirm surfaces, probably give them all a careful cleaning with 600 wet sanding paper. Thanks Andrew
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uncle-buck
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Joined: June-14-2004 Location: United States Status: Offline Points: 327 |
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Posted: October-10-2024 at 12:09am |
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Andrew, I replaced the metal fuel line in my boat with a flexible fuel line from SkiDim two years ago. Am using a nylon washer with the blue fitting into the primary bowl. It eliminated fuel leaks and facilitates regular cleaning/maintenance of the carburetor.
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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andrewmarani
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Joined: May-31-2005 Location: Baltimore, MD Status: Offline Points: 249 |
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Posted: October-10-2024 at 9:08am |
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I like that! I've had an issue with that line leaking every time i've pulled the carb.
As noted above, I pulled it apart and cleaned everything, sanded the surfaces with wet/dry 400 grit paper. Put it together and it still leaked. Took it apart and used some teflon tape on the threads of the flair nut where the fuel line connect and it stopped. Not sure if it was because the tape sealed things or if the slippery tape just allowed me to tighten up stuff a touch more. Thanks for the tip, I will buy one and replace my metal line this winter.
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uncle-buck
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Posted: October-11-2024 at 1:03am |
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Sounds good. Be sure and use a nylon washer with the blue fitting.
Tighten just enough to provide a good seal. I use a crescent or end wrench to hold it it place while tightening the fitting at the end of the flexible hose onto it. |
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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Posted: October-11-2024 at 7:03am |
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Buck.....you should at least tell him about getting an inlet filter that goes into his fuel bowl inlet to replace the screen in the old fitting.
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uncle-buck
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Joined: June-14-2004 Location: United States Status: Offline Points: 327 |
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Posted: October-14-2024 at 5:32am |
Good catch, KENO.
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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KENO wrote: