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| | | | Joined: Feb 2014 Posts: 319 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 319 | I decided on a carb rebuild and discovered the float bowl had a thick layer of sediment. Apparently I didn't get the tank as thoroughly cleaned as I thought.
Thanks to Maybellene for supplying a lost piece of linkage!!
Things seem to be much better - smoother idle, no leak, better acceleration, and the hot start problem seems to be solved but requires more testing.
My theory: the needle/seat contact was a mess leading to a bad idle, flooding after shutdown as gas drained out of the bowl, and a leak at the gasket as that draining gas hit the gasket and wicked out.
That's my story and I'm sticking to it...until experience proves me wrong.
A VW guy trying his hand at a '59 LB fs. Lots to learn, but it's about the journey.
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | the gas can't drain out, the inlet is at the top of the bowl. | | | | | Joined: Feb 2014 Posts: 319 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 319 | The needle & seat are at the bottom of the bowl. If there isn't a good seal the bowl will drain.
A VW guy trying his hand at a '59 LB fs. Lots to learn, but it's about the journey.
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | apparently you have a different carb than I have seen. What is it?
| | | | | Joined: Feb 2014 Posts: 319 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 319 |
A VW guy trying his hand at a '59 LB fs. Lots to learn, but it's about the journey.
| | | | | Joined: Feb 2004 Posts: 29,868 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,868 | what parts are you calling the "needle and seat"? The fuel inlet fitting is in the air horn, along with the float and the needle valve it controls, on every Rochester B I've ever seen.
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: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | you must have a mutant carb, the inlet on a rochester B is decidedly on top, it is actually part of the top of the carburetor, the inlet fitting, float and needle come off with the top when you remove it, at least all of them I have seen. Unless you have an updraft? I don't know anything about those. Nonetheless, the gas won't drain out.
Last edited by brokenhead; 12/04/2016 10:58 PM.
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | you aren't connecting the fuel line to the vacuum fitting are you? Don't know how that would work though.... | | | | | Joined: Feb 2014 Posts: 319 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 319 | Hey, you're absolutely correct. I must have been breathing fumes when I wrote that. The needle/seat control entry of fuel into the bowl, not air/fuel into the throat.
Mea culpa, mea stupidito.
A VW guy trying his hand at a '59 LB fs. Lots to learn, but it's about the journey.
| | | | | Joined: Feb 2004 Posts: 29,868 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,868 | A too-high float level or a flooding condition will allow fuel to spill out of the venturi onto the throttle plates, and leak out of the throttle shaft bushings, but once it reaches the proper level on shutdown the leak will stop. What's left in the float bowl will take several days to evaporate.
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: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | I have had the float "drop" too low and it stuck to the bottom of the bowl when the fuel evaporated, and it flooded bad for a minute or two till the gas dissolved the whatever it is in modern fuel. That one was on carbking, he said modern fuel makes a nice glue when it evaporates. I reset the drop, and the problem went away. | | |
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