Fuel leak at carb |
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OverMyHead
Grand Poobah Joined: March-14-2008 Location: MN Status: Offline Points: 4861 |
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Posted: September-17-2010 at 5:11am |
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I have a stubborn leak at the fuel fitting that enters the carb. Have tried tightening it multiple times but still get a small puddle on the manifold. Obviously not an acceptable condition. Can I use teflon tape or any other product on it?
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For thousands of years men have felt the irresistible urge to go to sea, and many of them died. Things got better after they invented boats.
1987 Ski Nautique |
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Morfoot
Grand Poobah Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5313 |
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I'd remove the fitting from the carb and make sure that the threads are clean and free from debris. Look at end of the tube to be sure it isn't cracked. Replace it if it is. You might have some old teflon tape on the fitting or in the base of the carb so clean up both and put some new teflon tape on the fitting and tighten it up. Leak check it again to be sure yo fixed it.
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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GottaSki
Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3337 |
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No, no tape.
Get a new metal gasket or fuel line if tightening doesn't work. |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Dave,
That flare needs to be double wrenched when tightening. It's a real tight area and on my Tique (had the same issue) I had to remove the throttle cable bracket to get to it. The problem is when it's tightened, you put a slight twist in the steel line and then the steel line will go back to it's original position unscrewing the flare adaptor. Loosen the flare first. Make sure the fiber sealing washer under the adaptor is in good shape. Tighten the adaptor and then double wrench the flare tightening it making sure you're not twisting the fuel line. A old trick is to use some lubricant under the flare nut (NOT on the flare itself) so the tubing will be free to rotate slightly until the flare is fully seated/tightened. |
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5775 |
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Exactly, the leak is probably not the flare fitting but the carb fitting with the screen in it. Replace the gasket and install this fitting tight then re-install your fuel line and see what happens. If that doesn't work replace the steel line itself. Pete suggested a while back to put a little grease on the flare fitting so the steel line can swivel as you're tightening, otherwise the line gets torqued and always wants to back off..Brilliant PS. chased this exact problem this summer and replaced both gasket and line to get it to stop. |
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behindpropeller
Platinum Member Joined: July-31-2006 Status: Offline Points: 1810 |
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Morfoot
Grand Poobah Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5313 |
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If the fitting screwed into Carb is still leaking even with a new gasket then why is using Teflon tape a no-no? Pardon my stupidity and misleading suggestion. Maybe I should just stick to turbine engines
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Tim,
If all else failed, I'd be putting teflon tape on it too! Really, the carb adapter needs to be tightened down and stay tightened. With the teflon and it's lubricity, I'd worry about the fitting loosening up. The new flat gasket should do it. |
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5775 |
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Best thing I've found to get that flare adapter tight is to get the fuel line out of the way and use a thin wall socket on it. Most other wrenches are just too bulky to get on it. Then go back and install the fuel line with the lube of choice and double wrenches.
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You can’t change the wind but you can adjust your sails
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OverMyHead
Grand Poobah Joined: March-14-2008 Location: MN Status: Offline Points: 4861 |
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I do not recal seeing the fiber gasket when I dissasembled the fitting. Can I pick that up at NAPA? or is it marine specific?
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For thousands of years men have felt the irresistible urge to go to sea, and many of them died. Things got better after they invented boats.
1987 Ski Nautique |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Dave,
You should be able to get it at Napa. As long as you're getting into the adapter, take it off and check the condition of the filter/screen under it. You may also want to take the adapter with you to Napa when you go for the sealing washer. |
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GottaSki
Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3337 |
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Because in these cases, the threads are not meant the sealing surface, like in pipe threads. Not on the adapter to carb body, nor the adapter to fuel line. Just an oppertunity for shredded tape to clog a jet or idle passage, or boogar up the needle and seat. And, I remember the gasket being a soft metal, not fiber. I concur, the two-wrench method is critical. |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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I believe this is what you speak of: GASKT FUEL INLET FITTING HOLLEY The part description even mentions it's a potential source of a leak. If it works it will probably be the best $1.39 you ever spend |
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5775 |
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the gasket is metal and you may have to order it from Summit, none of my local autoparts stores could get it unless I wanted to buy a complete rebuild kit.
gasket Edit : whoa, beat me to it and much cheaper! but yes that's the right part. |
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You can’t change the wind but you can adjust your sails
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I've had this same issue on and off since I got my boat. I had Eric tighten it down when he had the boat last year and it was fine until the last time I took it out and noticed it was leaking again. I was able to tighten it up enough to get me through the day, but I'm always checking for a gas leak there. I have replaced the fuel line and the gasket. I was planning on rebuilding the carb this winter and figured I would get it sorted out then but I may take a look at it tonight over a couple brews. I may hit the lake tomorrow and I want to make sure this thing isn't leaking.
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OverMyHead
Grand Poobah Joined: March-14-2008 Location: MN Status: Offline Points: 4861 |
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Noi Luck at NAPA but they recommende the carb shop. The palce must be good . they had a bout 15 carbs on their front desk and at least 100 in site. The guy new thae carbs and sold me on each of the two size seals that tehy use on the intake for a $1.25 each. Said he would rebuild the carb for about $190. I told him I had an issue with the low spped mis screws. He said they get messed up but as long as it idles ok dont mess with it. So I hope I will be good for now.
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For thousands of years men have felt the irresistible urge to go to sea, and many of them died. Things got better after they invented boats.
1987 Ski Nautique |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Dave, Must be a different carb shop. I've dealt with this place on a couple occasions. Once was looking for the Zenith T3X carb for my old 1927 Universal I rebuilt. He was the guy that said he had several but wanted $1600 for one rebuilt! The other time was to get a rebuild kit for the carb I did use for the engine that came off a Wisconsin 4 cylinder industrial. Glad you found the sealing washer as well as the other gaskets. Keep us informed on how the project of stopping the leak goes. |
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OverMyHead
Grand Poobah Joined: March-14-2008 Location: MN Status: Offline Points: 4861 |
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Pete, different place. This was in St Paul MN. Put in the new metal ring, cranked the flare adapter prety tight, then lubed the outside of the flare and tighend that fitting . Ran on the hose for about 5 minutes with no leak. will continue to watch. Thanks everyone.
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For thousands of years men have felt the irresistible urge to go to sea, and many of them died. Things got better after they invented boats.
1987 Ski Nautique |
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I never got to go to the lake this weekend but I do think I put a stop to this leak once and for all. Using a 1" socket to tighten down that adapter was key. Pete's tip using the grease on the flange fitting was brilliant as well. I ran it in the driveway for about ten minutes and no leak!
One thing I would add is that after you have tightened down that adapter with the 1" socket and you are reattaching the fuel line, get both ends of the fuel line attached but not tight, then tighten them down alternating between both ends until tight. Be sure that both ends are well seated before final tightening. Big thanks to Alan and Pete. |
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Keeganino
Grand Poobah Joined: October-27-2009 Location: North Carolina Status: Offline Points: 2063 |
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Good thread. I had the same problem when I got my motor back from the mechanic- go figure. Luckily all I had to do was take the metal gasket out, clean all the surfaces and it sealed right up. Have been keeping an eye on it and have not had any leaks since.
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"working on these old boats may not be cost effective but as it shows its what it brings into your life that matters" -Roger
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Randy, I'm glad it worked and happy to help out. Yes, aligning a hard flared line on both ends can be a challenge and I almost mentioned it in my grease under the nut post. The ends never seem to line up and care must be used to avoid cross threading the flare nuts. |
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skyhawkflyer
Senior Member Joined: February-08-2005 Location: Zimbabwe Status: Offline Points: 275 |
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Been there several years ago and fixed it... Here's how!
Remove the line, remove the fitting. Clean up the fitting well, mix up a small amount of Liquid Steel epoxy and apply to the threads and a dab on the thin washer. Screw it in and tighten it with a 1" 12 point socket and rachet. Let it cure, then reinstall your fuel line using pipe thread sealant (not the teflon tape) No more leaks, and it won't loosen up on you. Others may argue not to do this, however once installed you should never have to remove this fitting, even when overhauling the carb, there are no filters under it. Since I did mine I haven't had the problem of it leaking again and presenting an explosion hazard when I'm out skiing. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Thread sealant, liquid steel and no filter screen behind the flare adapter? Sorry but this is just poor advice. |
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82 Nautique 1
Senior Member Joined: January-06-2007 Location: Rock Island, IL Status: Offline Points: 265 |
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Pete,
I agree. Why jury rig something that could and should be done right ? Not worth the risk. Buy the parts, fix it right, it is a Nautique. |
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behindpropeller
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skyhawkflyer
Senior Member Joined: February-08-2005 Location: Zimbabwe Status: Offline Points: 275 |
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My 4160 just has a line adapter to the carburator, no filter underneath it, so no need to ever remove(I have a huge external water seperator/filter assy). I should have added that I was using a new line, washer, and adapter in an attempt to repair the leak permanently before a fire broke out. The new parts also leaked, and several of us came up with the JB Weld idea simply because in my application there is no need to ever remove it, this won't work for all as some carbs do have a filter.
I knew somebody wouldn't like this idea, but hey it worked very well for my setup, and it's been holding for almost 2 years now without leaks. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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The external fuel filters separators have been used since the 80's. Keep a eye on it since I have a feeling your gas isn't the greatest in your location.
Someone took the filter screenout of your carb!!!!! The fitting pictured on the right shows it. I suggest getting it back in there. Good luck getting the epoxy busted loose. |
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skyhawkflyer
Senior Member Joined: February-08-2005 Location: Zimbabwe Status: Offline Points: 275 |
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Nope, I ordered a replacement and a identical part came in. I'm leaving it as is, no leaks and it works great. I also use a filter funnel when fueling and haven't had a problem since I bought the boat in 1993. Mine is not like the picture.
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Are you sure? I have a 93 with the Holly 4160 and there is a screen in that adapter. It's kinda in the middle of the adapter, I didn't notice it the last time I had it apart, but noticed it when I had it apart last week. Mine was clean, but still not a bad thing to check. |
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john33617
Senior Member Joined: July-07-2004 Status: Offline Points: 182 |
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the problem is the steel line it keeps pressure on the fitting , JB weld the fitting in place , replace the steel line with a USCG hose , barb fittings on fuel pump and carb
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