'95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

MTate700

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Thanks to this site and a seloc manual first off, i can now yank the carb in and out in no time. thought i had this problem licked but I am stumped and cannot find a post with the same problem as mine. On the top cover of the primer system (on the side of my WMC carb) it has the little vent hole, my initial problem was fuel seeping from this hole. My motor runs fine it just leaks fuel at about one drop per second from this vent hole. I purchased a carb kit and replaced the diaphragm (old one was breaking down and sending little black rubber bits down into where check ball is located). I cleaned the area where the check ball seats and put the new part in and slapped on a new gasket. Put her all back together, she fired right up and purred but still has the fuel leak at the same exact rate from the vent hole. Now I suspect maybe the red check ball seat is worn and needs replaced but it appears to be built into the primer housing which is molded with the bowl. So Im unsure if I need to purchase the whole bowl because I cannot find anywhere that even gives the actual check ball seat its own part number, if indeed that is what is causing the leak.

The other half of brain cannot wrap around how fuel is getting above the diaphragm (being brand new) to even seep from the vent hole in the first place. Im kind of stumped and beginning to get nervous because those hickory shad will be spawning soon and I have 50 pound blue cats and stripers to catch with said shad. If anyone can give me any input I would really appreciate it. Thanks for taking the time to read this. Tight Lines
 

carholme

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Re: '95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

What is your engine s/n?

Gerry
 

MTate700

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Re: '95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

Og173164
 

carholme

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MTate700

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Re: '95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

Yes, that is the cover I am talking about, however, it is not leaking out of the top where the blue Push button (primer diaphragm) and seal is. On the port side of motor (in that exploded parts view it is on the far side that you cannot see) there is a small hole maybe 1/16" of an inch. That is where it leaks. I tried to get a good picture of the hole and circled it in yellow
 

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carholme

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Re: '95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

Because that hole is above the diaphram, it would seem to indicate that the diaphram is still leaking as that is the only way fuel can get on the top side of it.

Gerry
 

MTate700

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Re: '95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

I agree Gerry, I am going to go take the carb out again and get it back on the bench and try and figure this out. I know the the new part was good. Maybe I pinched it or something....Thank you for looking into it. I will update the thread on my findings. Gonna need a BLT in my stomach before I get my hands all 'gassy' again though!
 

MTate700

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Re: '95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

Took it back apart and sure enough, the diaphragm was pinched. Put it back together and it fired up on the first pull and no more leak! Thanks for the insight Gerry!
 

carholme

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Re: '95 15hp 2stroke changed primer diaphragm, fuel still seeping from vent hole

Good for you, hope you enjoyed your BLT!

Gerry
 
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