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AFB Fuel Leak |
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Ohio AMX 
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Charter Member Joined: Jun/29/2007 Location: NE Ohio Status: Offline Points: 4935 |
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 Topic: AFB Fuel LeakPosted: Jul/15/2007 at 5:43am |
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We just rebuilt the stock '69 AFB and now have a minor leak at the throttle shaft. It only leaks a couple minutes after shutting off the engine, not while running and it's only a few drops, then it stops. Is there a fix for this or is it worn out parts? It didn't leak here before the rebuild. Help!
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1940 Hupmobile Skylark
1968 Javelin future Pro Street 1969 AMX 290/auto (first car) 1997 Dodge SS/T 5.9L AMO# 983 |
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6PakBee
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Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
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Posted: Jul/15/2007 at 6:10am |
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Sounds like the fuel is leaking onto the throttle plates, and out the throttle rod opening. Percolation, too high a fuel level, or a leaking needle/seat???
Edited by 6PakBee - Jul/15/2007 at 6:12am |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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Ohio AMX
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Charter Member Joined: Jun/29/2007 Location: NE Ohio Status: Offline Points: 4935 |
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Posted: Jul/15/2007 at 6:18am |
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Thanks Roger, possibly the float level is set too high then?
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1940 Hupmobile Skylark
1968 Javelin future Pro Street 1969 AMX 290/auto (first car) 1997 Dodge SS/T 5.9L AMO# 983 |
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348AMX
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Joined: Jul/03/2007 Location: Massachusetts Status: Offline Points: 4165 |
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Posted: Jul/15/2007 at 11:24am |
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Yup sounds like a stuck needle float set to high or leaking float causing abnormally high fuel level. My original carter was prone to the exact same thing you are describing if it sat for long periods of time. Fuel leaking past the throttle shaft "could" be an indicator of worn throttle shaft bushings but worn throttle shaft bushings on the AFB would not "cause" a fuel leak, may make leaking fuel easier to get by though and WILL cause a vacuum leak evident as idle problems. Maybe pull a few plugs and see if they are carbon fouled? Other possibility is a leaking accelerator pump shooter gasket or a venturi cluster gasket?
Edited by 348AMX - Jul/15/2007 at 11:32am |
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poormansMACHINE
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Charter Member Joined: Jun/28/2007 Location: Shoemaker-Levy9 Status: Offline Points: 12302 |
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Posted: Jul/15/2007 at 12:52pm |
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I'll vote on the needle/seat, float as being the cause also.
If gas is coming out the throttle shaft, it's raining down from above after the engine is shut down. |
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purple72Gremlin
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Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
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Posted: Jul/17/2007 at 10:44am |
Ditto.
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poormansMACHINE wrote: