One carb is spitting fuel - Page 2 - Alfa Romeo Bulletin Board & Forums

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post #16 of 18 (permalink) Old 02-26-2017, 06:29 PM Thread Starter
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Originally Posted by VabeneGTV View Post
If it's leaking fuel is it possible that you have a faulty needle valve, assuming the floats are set correctly?
If it where the float, wouldn't that effect both venturies on that carb? Its only one venturi....
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post #17 of 18 (permalink) Old 02-26-2017, 06:32 PM Thread Starter
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Originally Posted by 101/105guy View Post
My thought too.....

A complete rebuild includes aligning the butterflys. A slightly bent throttle shaft will cause one or more throats to allow more air thru than the others. Idle enrichment screws should be ABOUT the same number of turns when properly tuned......

Spitting back can be caused by a lean cylinder.....
By rebuild, I meant taking the carb apart, replacing gaskets and replacing what ever parts are in the kit. I do not know how to align butterflys.
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post #18 of 18 (permalink) Old 02-26-2017, 08:44 PM
Richard Jemison
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Spitting fuel

Since it`s leaking from the rear side of the back carb, the issur most likeky is too high a fuel level in that carb. That side is the low end of all the 4 systems so I would lower the fuel first.

Spitting is caused by reversion in the intake system commonly caused by improper valve timing. Commonly too advanced cam timing. On these cars the cam timing marks are at 102 / 102. However a later TSB indicated they should be 104 / 104. If they are stock cams set at 102 check that valve lash, particularly # 4 is set at .018 intake ans .020 exh. Smaller lash settings would have the same effect of too advanced LCs on the cams.

Non stock high overlap cams have to be set at wider LCs as well or similar issues result.

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