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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / February 2007

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Carburetor problems

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Nikyu - 25 Feb 2007 02:57 GMT
I've got a Celebrity boat which has been having carburetor trouble
lately.  The carburetor is a Rochester Quadrajet Carburetor, Model
4MV, Rochester No.17083515.  It is used on a 1985 Chevy Marine engine,
V6/229 cu.in./ 185 Hp.  Droplets of gas can be seen in primary bores
(both sides) dripping from somewhere stalling out the engine after a
few minutes.  A new carburetor ran fine for a year but the same
problem is back again.  The original carburetor was rebuilt a few
times but the problem persists.

Anyone have any ideas?

Thanks,
Eric
Don Stauffer in Minnesota - 25 Feb 2007 15:29 GMT
> I've got a Celebrity boat which has been having carburetor trouble
> lately.  The carburetor is a Rochester Quadrajet Carburetor, Model
[quoted text clipped - 9 lines]
> Thanks,
> Eric

First thing I'd do is check the float. If the float is not "floating",
or is hung, the fuel pump will pump gas directly through jets.

Old Mopar products used to have a problem where the float was a
plastic material that would get gaslogged and partially sink.  The car
would run very rich and flood easily.  They kept making these floats
from same material for a decade or more :-(

A hole in a brass float, or corrosion or gum on float hinge is also
possible, or dirt in float valve keeping needle from closing all the
way.
Steve - 25 Feb 2007 23:38 GMT
> I've got a Celebrity boat which has been having carburetor trouble
> lately.  The carburetor is a Rochester Quadrajet Carburetor, Model
[quoted text clipped - 6 lines]
>
> Anyone have any ideas?

Sunken or stuck floats, or float level set too high.
Mike Romain - 26 Feb 2007 19:22 GMT
> I've got a Celebrity boat which has been having carburetor trouble
> lately.  The carburetor is a Rochester Quadrajet Carburetor, Model
[quoted text clipped - 9 lines]
> Thanks,
> Eric

I get a similar problem every couple years in my Jeep with it's carb engine.

The fuel they now have seems to be bad for gumming up float needle
slides.  I need to pull my needle and seat out and clean them or kit the
carb every couple years.  It is the sliding area in the seat portion
that gets gummy.

At least on mine the needle and seat come out from the outside.  :-)

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
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dahpater@yahoo.com - 26 Feb 2007 19:43 GMT
> I've got a Celebrity boat which has been having carburetor trouble
> lately.  The carburetor is a Rochester Quadrajet Carburetor, Model
[quoted text clipped - 9 lines]
> Thanks,
> Eric

Droplets/dripping are a sign of something as simple as a vaccum leak
or the air mixture screws not adjusted correctly. If you've eliminated
those two, then your float is a little to high, the needle and seat
are bad, or has some dirt in it. Might want to make sure it's venting/
purging also. The float only has to be 1 or 2 32nd's to high to create
a problem. They are a little tricky to get just right.
 
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