Thread starter torbac73 Start date Nov 12, Toggle sidebar. Boating Forums Boating Discussion. I have a 78 Jack 20 with a small block Chevy The carb is corroded to the point that a rebuild kit wont seal. A friend gave me a Demon carb. I can install it if I get a new intake manifold but I'm not sure if there are safety risks as far as fumes in the bilge.
What about fuel economy? Can I go with any old quadrajet? I've also heard of people going to a two barrel, any thoughts? Thanks, Torey. Upvote 0. If it looks like a duck and quacks like a duck, it must be a duck. Well, maybe. Carburetors are carburetors, but only marine carburetors should be used on boats. It's true that marine carburetors started life as regular automotive carburetors but then each took divergent paths.
Marine carburetors have certain modifications that make them uniquely adaptable and legal for marine usage. Coast Guard test for marine carburetors. Folks, I'm not talking about Paris Island here, either. The main qualification that a marine carburetor must meet as set down by the U. Coast Guard is that if the carburetor should "flood" only. For this reason a gasket is not used between the carburetor air horn flange and the flame arrestor. It's possible that this gasket could become saturated with fuel if the carburetor should flood and become a potential fire source as a result.
The primary areas of a carburetor that require some sort of modification to meet these requirements include the fuel bowl vent tubes and throttle shafts. The vent tubes of a marine carburetor are bent inwards so that the tube looks like an inverted "J".
These tubes oftentimes are referred to as "J" tubes, as a result. The reason for bending the tubes inward is that if flooding should occur, the fuel that would normally come out of the fuel bowl vent tube is rerouted back into the carburetor. Throttle shafts also get special machining attention. Shafts are "grooved" and "slabbed" to prevent fuel from exiting out the throttle shaft if flooding should occur. Search titles only. Search Advanced search…. New posts. Search forums. Log in.
Install the app. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter waterdawg69 Start date Jul 16, Joined Jul 6, Messages Don S Honorary Moderator Emeritus.
Joined Aug 31, Messages 62, Re: whats the diff between marine carb and auto carb? Coast Guard test for marine carburetors. Folks, I'm not talking about Paris Island here, either. The main qualification that a marine carburetor must meet as set down by the U. Coast Guard is that if the carburetor should "flood" only.
For this reason a gasket is not used between the carburetor air horn flange and the flame arrestor. It's possible that this gasket could become saturated with fuel if the carburetor should flood and become a potential fire source as a result. The primary areas of a carburetor that require some sort of modification to meet these requirements include the fuel bowl vent tubes and throttle shafts.
The vent tubes of a marine carburetor are bent inwards so that the tube looks like an inverted "J". Find all posts by thatsmrmastercraft. Send a private message to CruisinGA. Find all posts by CruisinGA. Quote: Originally Posted by CruisinGA I don't have a carbed boat but curious, can you just replace the straight vents on an automotive carb with marine "j" vents? Posts: 4, Send a private message to 03 35th Anniversary.
Find all posts by 03 35th Anniversary. Send a private message to WA Nautique. Find all posts by WA Nautique. Quote: Originally Posted by WA Nautique the J tubes come out, they are splined pull up, don't twist , and can be removed by inserting a screw driver blade under the "bulb" at the base and working the tube up gently.
Send a private message to waterlogged Find all posts by waterlogged Strreamline TT Enthusiast. Send a private message to Strreamline. Find all posts by Strreamline.
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