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1972 2 HP Evinrude Leaking Gas

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Bilgerat984

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Model 2202M, 2 hp Evinrude Mate leaking gas. I've replaced the needle & seat and the gasket. It's a plastic float & appears to be good. The gas is actually leaking up out of the main jet. There was a great deal of corrosion on this carb when I got the engine. It seems like when I turn on the gas valve, the float chamber pressurizes & forces gas up the main jet. There doesn't appear to be any venting for the float chamber, which seems odd. Of course, it's possible that it's been corroded over & I'm missing it. Has anyone dealt with this problem before?
 
There has to be a vent for the float chamber.-------------If there was no vent the carburetor would not work.---------Nozzle gasket is in place ?
 
Yup. The nozzle gasket is new as well. That's what I though about the vent too. The trouble is, I don't see one anywhere. If I knew where it was supposed to be I could probe for it & clean it out.
 
All carburetor float chambers have a vent located in the carburetor upper body, if air cannot get out, fuel cannot get in.... the fuel will instead take the route you describe. Look extremely close at the underside of the upper carburetor body.
 
@joereeves - I agree. The $64 question is WHERE is that vent? I've been probing with dental picks & I can't find it.
carb_detail_01.jpgcarb_detail_02.jpg

As you can see from the pictures, there is nothing apparent. There is that one area in the second picture, just to the immediate right of the venturi that' is nearly impossible to probe or see into. I suspect, at this point, the next step will be to remover the welch plug & drill out the lead shots & probe from there.
 
Found it!

I pulled the welch plug & drilled out the lead shots. As it turns out, just about every passage was blocked solid with corrosion. The main jet was pretty much the only passage left open. The vent was (of course) in that impossible to see or probe area. The float chamber actually vents through the low RPM jet ports in the venturi. The gas passage to the jets was clear, but the vent passage was completely blocked with corrosion.

In the first picture, you can see the pin vise with the drill sticking through the vent passageway. In the second picture you can see the tip of the probe just peeking out of the vent hole. (red arrow)

carb_detail_03.jpg

carb_detail_04.jpg

Btw, a .177 lead pellet is the perfect size to plug the ports back up.
 
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