| [GMCnet] Primary venturis fuel drip at idle [message #333705] |
Tue, 19 June 2018 15:54  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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Hi Dave,
My suggestion is to save yourself untold frustration by ditching all that stuff and install a modern self learning EFI. Your coach
will drive far more like a modern car.
All gain and no pain except for a one time $1000 hit to your bank account
Jerry
Jerry Work
Kerby, OR
......:::
ate: Tue, 19 Jun 2018 14:27:59 -0400
From: "Dave Stragand"
To:
Subject: [GMCnet] Primary venturis fuel drip at idle
Message-ID:
Content-Type: text/plain; charset="us-ascii"
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
...........
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Jerry & Sharon Work
78 Royale
Kerby, OR
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