Leaking carburetor
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=49814
Printed Date: November-14-2024 at 6:09pm
Topic: Leaking carburetor
Posted By: Slalom fan 4
Subject: Leaking carburetor
Date Posted: May-15-2021 at 8:58pm
| I have gas coming from the top of my carb on the port side stern end were there was a red seal type substance. The boat is a 93 sport with holly carb. Any ideas? |
Replies:
Posted By: 8122pbrainard
Date Posted: May-16-2021 at 5:27am
|
Rodney, Sounds like the leak is at the welch plug? Is it the small round disc on the float bowl?  If so, it's a common spot for a leak. Clean up the area and use some epoxy on top of the plug. A aluminum filled epoxy is best. Welch plugs:  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: May-16-2021 at 6:35am
|
If you really want to know what's in there here's a picture of that so called "welch" plug and the O ring that's on it. The O ring gets old and brittle and leaks if you want to pull the plug, you'll destroy it so it's either replace the bowl or epoxy over the plug. You should probably epoxy over the other 3 plugs that are on your bowls too, since they're all the same age and maybe getting ready to leak when you least expect it.  Plenty of people have epoxied over their plugs with no issues as long as the prep was good.  |
Posted By: Nautiquehunter
Date Posted: May-16-2021 at 7:20am
| I had one leak on a 84 351 . I replaced the bowl I didn't want to take a chance of a fuel leak wile using it. |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:20am
| That's it thanks for the info. |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:36am
| I've never worked on carb so how hard I it to replace the bowl? |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:55am
| Also what is the purpose of having a plug there and why aren't they replaceable? |
Posted By: 8122pbrainard
Date Posted: May-16-2021 at 10:26am
The hole is only used once and that's for machining the hole directly behind the plug. After the machining is done the hole is plugged. Drill bits can't go around corners.  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Slalom fan 4 wrote:Posted By: Slalom fan 4
Date Posted: May-16-2021 at 10:32am
| Oh that makes sense. |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 4:19pm
| How hard is it to replace the bowl? Is j itjust like a housing or are float and. Valve involved? |
Posted By: KENO
Date Posted: May-16-2021 at 4:53pm
|
4 bolts/machine screws and it's off. You may or may not destroy the gasket, if you do, you'll need to take the secondary metering plate off to replace the gasket. It takes a clutch head screwdriver (or the right sized flat blade will work for us backyard hacks) Then there's the O ring on the fuel transfer tube that may or may not need to be replaced, they can get pinched when reinstalling the bowl. Then you have to swap the internals (float, needle and seat assembly, spring, baffle plate to the new bowl. If you have the extra parts on hand, you won't need them but if you don't you'll need them. I'd have them on hand . Then hope the front bowl doesn't start to leak after you've replaced the secondary. You can find plenty of Holley how to stuff on the internet
|
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 5:29pm
| Ok thanks. I might just replace the whole carb instead it sounds like there's plenty of old gaskets and other pieces that are bound to fail. My son in law is a manager at auto zone so I'll get a discount and it sounds much easier to replace than rebuild. |
Posted By: KENO
Date Posted: May-16-2021 at 5:40pm
|
Let's hope he can get a marine carburetor for you
|
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 5:46pm
| Oh boy I didn't know that it was was a marine carb. |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 5:49pm
| Wow that's a big price difference I just googlet it. |
Posted By: KENO
Date Posted: May-16-2021 at 7:04pm
|
I think you can handle the float bowl swap Rodney................and I know you can handle an epoxy job. Even if you want to call the epoxy job "temporary", it'll get you running and last for a lot of years. Like mentioned earlier, lots of people have done it.
|
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 7:17pm
| Yes I will definitely start with that. Thanks so much for the advice I know I can always find the answer here. |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:01pm
| BTW how do I figure out which model of carb I have in the event I need to replace the bowl? |
Posted By: 8122pbrainard
Date Posted: May-16-2021 at 8:20pm
You should have a 4160 model then the list number is what's important.  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: 8122pbrainard
Date Posted: May-16-2021 at 8:28pm
About $4.00 ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:38pm
| The numbers I got fijl-ca then 50469-1. Then 0143 |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:39pm
| I have fijl-ca. Below thar 50469-1. Then below that 0143 |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:41pm
| Sorry I replied to wrong person I got fijl-ca. 50469-1. 0143 |
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 8:44pm
| I think someone already sealed both plugs previously with a red colored sealer however the leaking one literally dissolved whatever it was. |
Posted By: KENO
Date Posted: May-16-2021 at 9:43pm
50469-1 is the list number red colored sealer has images of RTV dancing through my mind Whatever it might be, see if you can clean it off and epoxy both plugs and the front 2 also while you're at it. it's worth the try.
|
Posted By: Slalom fan 4
Date Posted: May-16-2021 at 9:52pm
| For sure it couldn't hurt |
Posted By: pjsmoreno
Date Posted: May-17-2021 at 10:49am
|
It’s scary when you have gas leaking from the carburetor
into the intake manifold. Then being out on the water can un-nerving. I wouldn’t
trust any epoxy sealer since the fuel presser is on the inside of the bowl and
you’re trying to fix the problem from the outside. Holley does have the primary
and secondary bowls listed on their website if you want to replace. But then I was in the same situation with my old Holley leaking.
After replacing secondary twice, I received a new Holly for Father’s Day. I’m a penny puncher but on this I would just
bite the bullet and buy a new Holley if it’s possible. I just kept putting it
off. |
Posted By: TRBenj
Date Posted: May-17-2021 at 12:24pm
| I too have seen those leaky Welch plugs sealed up with jb weld last for years and years. Hardly a reason to replace a carb, imho. |
Posted By: Slalom fan 4
Date Posted: May-17-2021 at 12:38pm
| I have just completed the epoxy job and I am already looking at new holley and normally it would already be ordered but I bought her last year and already. Did trailer bunks, steering cable, throttle and shift cables, and just had new pcm 80a tranny installed after old one started leaking last September so 5k in repairs already way past "BOAT". |
Posted By: 8122pbrainard
Date Posted: May-17-2021 at 1:03pm
No problems with my epoxy jobs ether. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Slalom fan 4
Date Posted: May-17-2021 at 1:05pm
| Fingers crossed, I prepped with a little sandpaper and acetone. |
Posted By: KENO
Date Posted: May-17-2021 at 1:43pm
It'll save you some money if you eventually go the new carburetor route. Maybe your son in law can get one through Auto Zone too
|
Posted By: Slalom fan 4
Date Posted: May-18-2021 at 6:54pm
| Someone did mention the m600 and that was a rep at holley. Still waiting on repair its been 30 hours just need to get it to the water unless just turning on key is enough to fire up fuel pump and pressurize the bowl enough to check for leak. |
Posted By: KENO
Date Posted: May-18-2021 at 7:09pm
|
I'm thinking you have a mechanical fuel pump that won't pump unless the engine is running
|
Posted By: Slalom fan 4
Date Posted: May-18-2021 at 10:20pm
| Update, the jb weld worked. |