| [GMCnet] Primary venturis fuel drip at idle [message #333699] |
Tue, 19 June 2018 13:27  |
Dave Stragand
Messages: 307
Registered: October 2017
Karma:
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Senior Member |
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Hi All,
I noticed today on my 1978 403 that the primary venturis both have a
steady splatter/drip of fuel at idle. I would get the same thing
occasionally on the professionally rebuilt QuadraJet on my '68 Caddy.
The cause was generally a sticking needle/seat/float - and a quick tap
or two on the carb from a rubber or plastic mallet would make everything
peachy again for a few months.
On my coach I have a quite a few more unknowns, such as:
- what the timing may currently be set to
- a number of disconnected and plugged vacuum lines
- if the idle mixture is correct
- overall engine condition
So I was looking for a bit of advice on what the most likely cause(s)
would be so I can check them in that order. My thoughts are (most
likely first, least likely last):
- debris stuck under needle
- improperly adjusted float
- incorrect timing (easier to check though than the first two)
- saturated float
- vacuum leak
- vacuum issue due to removed/plugged lines
- carburetor passages blocked internally somewhere
- incorrect idle mixture
- over pressure fuel pump (mechanical)
Would anyone like to add any thoughts, advice, or additional
troubleshooting steps on my carburetor conundrum?
Thanks,
-Dave
1978 Transmode near Pittsburgh, who thinks EFI is looking better and
better. =)
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1978 Transmode (403)
Pittsburgh, PA
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