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fuel leak at the carb

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keegan99usa View Drop Down
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    Posted: July-26-2012 at 2:39pm
my 1991 SNCB just started leaking at the carburetor. This is right at the fuel line intake. I tried to tighten the compression fitting and it turns slightly, but then backs off the same amount when I let off wrench pressure. I then held the larger (1") fitting and was going to take the compression fitting off. I had ALOT of arm power into the two wrenches and did not want to add more pressure, thinking it was going to break something. Ifigured I should have the new parts on hand to do this right. Where can I buy the new fittings? It seems like maybe the barrel part(real techie term right?) of the carburetor is where the leak is at. Last time out is when I smelled the gas and checked under the cover and the 1" or so tube portion of the carb. intake ws wet with gas and there was about a cap ful of gas sitting on the intake.
Suggestions?

Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 3:13pm
Check this out, I just fixed the same problem last weekend.

The reason it wants to back off, is because the fuel line flange, is sticking to the fitting (it should be able to move independently). So, as you tighten, the metal fuel line is winding up like a spring. When it unwinds, it loosens the fitting. So, you want to seperate, and grease that flange.

The reason I removed the acc pump lever/linkage in this write up, is because it was getting in the way of tightening the 1" carb adapter. That was the only detail I left out.

You can get the gasket at skidim, and the line to bowl adapter there as well, but you shouldn't need that unless it gets broken.
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=27143&title=cool-carburetor-tool-and-fixed-fuel-line-leak
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 3:36pm
Dan,
Hopefully you do not have a compression fitting at the carb adapter. It should be a flare just as Brian showed in his pictures. If it is a compression, someone has been messing with the fuel line.


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keegan99usa View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote keegan99usa Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 3:49pm
Pete
Mine looks just like the write up from Brian. I shall get a gasket ordered ASAP, part number anyone????
THanks guys
Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lakedog55 Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 4:12pm
If your in a hurry to save the weekend. You could try taking apart and adding a good wrap of teflon tape being sure not to cover the ends and put back together. I found that the fuel line is easy to get cross threaded and found it easier to loosen the carb. I also had really fresh gaskets under the carb. Not sure what would happen with an older gasket.
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 4:27pm
Originally posted by lakedog55 lakedog55 wrote:

If your in a hurry to save the weekend. You could try taking apart and adding a good wrap of teflon tape being sure not to cover the ends and put back together.
Mike

Mike,
There are two potential spots for the leak at the carb. The one with the fiber (or copper) washer under the bowl adapter to the carb and the other one at the flare fitting. Yes, a few wraps of teflon as a temporary solution for the washer under the adapter may work but I do not recommend it at the flare fitting. A flare fitting seals at the tubing flare itself and not the threads of the flare nut. The nut is simply a means of compressing the flare to the adapter. I just wanted to clear this up before somone wraps the flare nut with Teflon tape and then ends up with gas all over the place.


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Bri892001 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 4:37pm
The adapter fitting and gasket are parts 0433 and 0434 on this page:
http://www.skidim.com/products.asp?dept=1055

Like I say, you shouldn't have to buy the adapter, but it's good to have the new gasket on hand.

Although, your old gasket could be fine, it could be just the fitting has come loose.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lakedog55 Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 4:50pm
Sorry Pete,
Just offering a possible fix to save a weekend of skiing. I am with the other guys as far as putting the proper parts back on.
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dreaming Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 5:02pm
you can get a preflared brake line at your local auto parts store, purchase a tubing bender at the same autoparts store, or harbor freight if you don't have one.   you should be able to bend up a new line pretty quickly and for about $20 bucks.   I did mine in about an hour or so , but I had to cut the tube and double flared the other end as my local carquest didn't have the right lenght of tubing. double flaring can take some practice, but it is doable if you're handy... you'll need the flaring tool, and make sure you put the b-nut on the pipe before flaring
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 5:03pm
Originally posted by lakedog55 lakedog55 wrote:

Sorry Pete,
Just offering a possible fix to save a weekend of skiing. I am with the other guys as far as putting the proper parts back on.
Mike

Mike,
No problem and I completely understand your intent. I just wanted to differentiate the two spots where it could leak.
The typical spot as mentioned is the adapter to the bowl due to the mentioned problem of the fuel line wanting to "unwind" the adapter.


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keegan99usa View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote keegan99usa Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 6:50pm
thanks all for the help. Gasket is $1.68, then $10 to ship it here, lol. Trying to find one local if i can. Auto parts store?? probably not huh?
Dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2012 at 7:00pm
I'd give Skidim a call.

I ordered my gasket along with a couple other things, like a fuel filter etc.

But, I've talked with them in the past on small items. Karen (at skidim) said they'll pop small stuff like that in a regular envelope. I don't think the online, automated store always accounts for that.

Your local dealer might have the part in stock if they've been selling since the carbureted days. This part is probably common accross a lot of boats that had holley, even mercruiser used Holley, so likely this gasket could be common.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote YooperSully Quote  Post ReplyReply Direct Link To This Post Posted: July-27-2012 at 11:02am
buy a set of flare nut wrenches to aid in tightening the fuel line down, I put a new hard line on last year. Tried to assemble with open end box wrenches and had fuel leak issues quite often. New line this year, installed with flare nut wrenches, much easier and definitaly more secure.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-27-2012 at 11:06am
Originally posted by YooperSully YooperSully wrote:

buy a set of flare nut wrenches to aid in tightening the fuel line

Roger,
Go to the link in the second post in this thread. You'll see that the flare nut wrench idea (with pictures) was covered.

Here's the link again


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Post Options Post Options   Thanks (0) Thanks(0)   Quote OverMyHead Quote  Post ReplyReply Direct Link To This Post Posted: July-27-2012 at 11:09am
A little grease on the outside of the flare will help reduce its desire to bind with the nut and loosen back up. (A tip I got from Pete)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote keegan99usa Quote  Post ReplyReply Direct Link To This Post Posted: July-27-2012 at 11:16am
was able to loosen the connection and retighten, all is good, thanks for the help. Still gonna get the gasket coming
Back on the water tonight, lol.
dan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-27-2012 at 11:59am
Originally posted by keegan99usa keegan99usa wrote:

was able to loosen the connection and retighten, all is good, thanks for the help. Still gonna get the gasket coming
Back on the water tonight, lol.
dan


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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-27-2012 at 12:48pm
Originally posted by Bri892001 Bri892001 wrote:

Originally posted by keegan99usa keegan99usa wrote:

was able to loosen the connection and retighten, all is good, thanks for the help. Still gonna get the gasket coming
Back on the water tonight, lol.
dan



Dan,
Keep an eye on it just to make sure the fuel line wasn't wound up when you tightened it. I've been there as well as others where the wind up will unscrew the carb flare adaptor.


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keegan99usa View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote keegan99usa Quote  Post ReplyReply Direct Link To This Post Posted: July-27-2012 at 12:51pm
Will do Pete, but it did tighten without twisting the line like it was doing. Thanks again!
Dan
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