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It's amazing how little crud it takes to keep the float valve from closing.
replaced my old fuel pump with a new fuel pump once and the thing started
leaking. A rebuild kit from Moyers solved the problem. And its fairly easy
to do. On the other hand, a <i>new</i> carb from Moyer is only $150...<br>
<br>
Mike Lehman wrote:<br>
<blockquote type="cite" cite="mid:F5941sOBfCz6ticW5PZ00022bfa@hotmail.com">
<div style="background-color:">
<div>
<p>I have an idea - remove the carbeurator and take it to John Vosbury.
I have had to chase down leaks [sometimes successfully sometimes not] it's
too important not to get right. <br>
<br>
</p>
</div>
<br>
<br>
<br>
<div>Mike Lehman </div>
<div>"Gilleleje" #505 </div>
<p>"One can never enter the same river twice. The river is always new;
the man is forever changed."</p>
----Original Message Follows---- From: J Bergquist <J @ship.saic.com=""></J>
Reply-To: <a class="moz-txt-link-abbreviated" href="mailto:public-list@alberg30.org">public-list@alberg30.org</a> To: <a class="moz-txt-link-abbreviated" href="mailto:public-list@alberg30.org">public-list@alberg30.org</a> Subject:
[Alberg30] gas leak from carburetor Date: Mon, 17 Jun 2002 09:50:11 -0400
Dear Albergers, I have a gas leak. I thought I would be able to fix it
myself, but I am pretty stumped at this point. My atomic4 has an early model
block with a late model carburetor and ignition system. I have a diaphragm
fuel pump that I did not rebuild or otherwise monkey with when I had the
engine removed for the stuffing box service this spring. I kind of wish I
had. I DID rebuild the carburetor, including having it cleaned thoroughly
by a friend who has an ultrasonic parts washer (very cool machine). After
reassembly and installation of the engine, when I hooked up the fuel lines
and opened the valves, everything seemed fine. No gas leaking. However I
was not able to get the engine running due to operator error in assembling
the ignition system. ;-) Once I got the ignition system fixed, the engine
seemed to run fine, but I was leaking gas from the carburetor. It was dripping
from the drain plug at the bottom of the sediment bowl. Admittedly, I was
not sure if a loose plug was the problem because it's a low point and gas
would collect there before dripping, so I took the carburetor off for checking.
And I discovered that I actually have two drain plugs at the bottom of the
bowl and one of them was indeed not screwed in all the way (although it did
not seem particularly loose). I tightened it and the fuel leak seemed to
stop (the bowl was still full). So I though the problem was solved, and I
happily reinstalled the carburetor, cleaned everything up and gave it a whirl
again. It seemed fine and everything remained dry and sweet smelling, until
I turned the engine off. Then it started dripping again. This time I was
able to feel that the gas was actually leaking down around the sides of the
float bowl, so couldn! 't be comin! g from the plug(s). It must be either
from a crack in the bowl (which I was unable to see, and which seems unlikely
since there is no leakage when the engine is running) or from overflow somehow.
My current theory is that I have some gunk stuck in the seat of the float
valve and it is not shutting off the gas line running into the float bowl
and so gas is running down the line and into the float bowl (however, I am
currently closing the gas line valve every time I turn off the engine to
prevent this, which seems to work). This doesn't occur when the engine is
running because the gas level in the float bowl remains consistently lower
since the engine is consuming gasoline as it flows into the bowl. I have
also been told that the two mating surfaces of the carburetor can tend to
get warped and that perhaps the top and bottom half are not mating sufficiently
well to get a good seal at the gasket. I guess this could also be the problem.
Does anybody else have any other ideas what might be causing this kind of
gas leak? Has anybody had a cracked float bowl before? I know it's very
dangerous, and I am doing my very best to get it fixed ASAP. Thanks for
all the great advice! J Bergquist Calliope #287 +---------------------------------------------------------------+
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