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Another Leaking Carb
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- Team Cub Guide
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Another Leaking Carb
A local fellow cubber came by work Saturday with his IH carb in hand looking for the answer to the continuous fuel flow out of his carb, after a new kit was installed. He did install the IH kit and replaced everything. After a few minutes, we determined that the float level was to blame. He referred to the instructions that came with the kit for proper float setting. He returned this morning to say that all was well and the carb was not leaking. About an hour later, he shows up saying the carb is now leaking fuel again. Anybody got any ideas
"Never forget where it is you come from, or you may find yourself someplace you don't want to be"
Greg Norman
Greg Norman
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- 10+ Years
- George Willer
- Cub Pro
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One last step... make sure the gaskets under the needle seat and and nozzle are sealing. These are a commonly overlooked source of leaks.
George Willer
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
- Lurker Carl
- Cub Pro
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- Joined: Mon Feb 03, 2003 9:54 am
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Cub-Bud,
Donny's right, usually there's crap from the tank or fuel lines keeping the needle from seating. Here's a few other things to check:
Warped bowl castings? Stripped threads? Fuel in the float?
The float may be contacting the side of the fuel bowl. Check the clearances on both sides of the float AND the end that swings. I had one carburetor where the bowl casting was bent inward enough for it to catch the float and caused major flooding or starve for fuel. Also check if the float axle is binding.
The cage gasket and fuel discharge nozzle gaskets can leak, use a fuel resistant thread sealant and sparingly apply it with a toothpick. Don't use teflon tape!
Even at the factory spec, the float level may be too high. You must check the fuel level with clear tubing attached to the bowl drain. Some floats are heavier than others and heavy floats will flood at factory settings. Fuel level in the bowl should be 9/16 - 5/8 inch from the gasket as installed on the tractor.
Make sure the needle and cage were replaced as a set. Needles and cages are different. I use the needle and cage parts from the Kohler small engine carb kit - they work very well.
Lurker Carl
Donny's right, usually there's crap from the tank or fuel lines keeping the needle from seating. Here's a few other things to check:
Warped bowl castings? Stripped threads? Fuel in the float?
The float may be contacting the side of the fuel bowl. Check the clearances on both sides of the float AND the end that swings. I had one carburetor where the bowl casting was bent inward enough for it to catch the float and caused major flooding or starve for fuel. Also check if the float axle is binding.
The cage gasket and fuel discharge nozzle gaskets can leak, use a fuel resistant thread sealant and sparingly apply it with a toothpick. Don't use teflon tape!
Even at the factory spec, the float level may be too high. You must check the fuel level with clear tubing attached to the bowl drain. Some floats are heavier than others and heavy floats will flood at factory settings. Fuel level in the bowl should be 9/16 - 5/8 inch from the gasket as installed on the tractor.
Make sure the needle and cage were replaced as a set. Needles and cages are different. I use the needle and cage parts from the Kohler small engine carb kit - they work very well.
Lurker Carl
-
- Team Cub Guide
- Posts: 3544
- Joined: Sun Feb 02, 2003 6:30 pm
- Zip Code: 38658
- eBay ID: Cub-Bud
- Tractors Owned: Four FCUBs, one IH Lo-Boy, one B Farmall, two Cadets, and a John Deere B.
- Circle of Safety: Y
- Location: MS, Pope
-
- Team Cub Guide
- Posts: 3544
- Joined: Sun Feb 02, 2003 6:30 pm
- Zip Code: 38658
- eBay ID: Cub-Bud
- Tractors Owned: Four FCUBs, one IH Lo-Boy, one B Farmall, two Cadets, and a John Deere B.
- Circle of Safety: Y
- Location: MS, Pope
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