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| | | | Joined: Feb 2010 Posts: 476 'Bolter | | 'Bolter Joined: Feb 2010 Posts: 476 | I went out to crank my 46 COE and I have gas dripping out of the throat of my updraft carb. It was new when I put the truck together 7 years ago. I had the idle turned up a little high, could that cause it? If not what. Thanks for any input! | | | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | May have a little debris keeping the float valve open, causing it to flood. Gently tap around the carb with the wood handle of a hammer or similar soft tool to see if it can dislodge it. Aqvoid hitting the cast seams.
Good luck
Dave | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | That's why most updraft carbs have a small hole drilled in the air horn or maybe in the rubber elbow that connects to the air cleaner. It keeps gas from a flooding situation from filling up the intake manifold. Flooding from debris in the fuel is a very common occurrence on an updraft, particularly on tractors, etc. Some of them have a porous bronze plug staked into the air horn to serve as a drain.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2010 Posts: 476 'Bolter | | 'Bolter Joined: Feb 2010 Posts: 476 | Thanks, Any idea where I could get one of these porous plugs with a 1/8 NPT thread, I removed the solid plug from the air horn and the gas drained out. A lot better than it filling the air cleaner tube and dripping off the exhaust pipe.
Last edited by Chris's 46 / 515; 01/18/2016 2:34 AM.
| | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | Look on Ebay for "sintered bronze breather". There are several sizes listed, including 1/8" NPT.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Nov 2002 Posts: 2,763 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,763 | Another possibility to the sintered bronze is to look at marine applications.
As leaks on closed-bilge boats are very undesirable:
(1) an 1/8 inch pipe fitting is screwed into the 1/8 pipe tap in the airhorn boss.
(2) a "drip loop" is formed from copper tubing.
(3) a second pipe fitting replaces the headless plug above the throttle plate.
(4) and the tubing is connected to the second fitting.
Result, fuel which drips down from gravity once the engine is turned off will end up in the drip tube, and will be pulled into the intake manifold assisting the choke in starting the engine when the engine is cranked, and vacuum is applied to the tube.
As the hole in the casting beneath the second fitting is small, the resultant "vacuum leak" is manageable with idle adjustment.
This arrangement was used on marine applications as late as the late 1960's.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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