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| | | | Joined: Jun 2009 Posts: 98 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 98 | My recently rebuilt Zenith updraft tends to annoyingly dribble gas out the air intake for a minute after shutdown. Question is, is this normal? If it isnt what did I do wrong on the rebuild?
Any other thoughts and comments on this would be appreciated.
Zenith carb #10557A GMC FF353 248
Thanks, John | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | While it is not all that uncommon, it is not normal. Something must have went wrong in the rebuilding. | | | | | Joined: Apr 2008 Posts: 502 Shop Shark | | Shop Shark Joined: Apr 2008 Posts: 502 | Strange idea, is the carb hot and the gas boiling out(percolation)? I could see a lot of heat being trapped in that engine compartment. | | | | | Joined: Jan 2010 Posts: 37 New Guy | | New Guy Joined: Jan 2010 Posts: 37 | Have you confirmed the float level?
| | | | | Joined: Jun 2009 Posts: 98 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 98 | Thanks for the replies. What I did was increase the idle speed and then lean the carb out to slow the engines idle speed. That made difference, acceptable but still not totally dripless. By mid march I hope to have it back in the frame and play with the adjustments some more. At least the engine runs and that makes me
happy. Thanks again | | | | | Joined: Jan 2008 Posts: 165 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2008 Posts: 165 | It may be a question of a high float setting, but is there a gasket or spacer between the carb and manifold, it needs the thicker spacer that acts as an insolater gas gets warm when the engine is shut down and will bubble out with out it. | | | | | Joined: Jun 2009 Posts: 98 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 98 | The spacer is in place. I lowered the float a five times. At first the gas just poured out while it was running. After the fifth bending the gas stopped and the engine decent. I`m thinking the fuel pump pressure overcomes the needle and seats ability to check the flow. Right now the engines out of the frame but when the weather warms up I`ll go back at it.
I did pick up a NOS bendix/zenith univeral carb that I`ll try when things warm up. | | |
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