Briggs 12H802 leaking gas from primer bulb

asand211April 18, 2007

Mower is about 7 or so years old and started leaking gas from primer bulb. Anytime gas is put in tank it immediately begins pouring out of primer bulb. The float moves freely and the needle have is in perfect shape. The only thing is there is no rubber gasket in the valve seat or on the end of the valve. Just metal on metal. Is that normal? I bought a gasket kit from Jacks Small Engines and the only gasket even close to that size is too large. What am I missing?

Thank you for reporting this comment. Undo
paulg78

What is the type on it?
From what I can see, most likely the flange of the bulb acts as the gasket. Replacing the primer assembly might solve your problem (only about $5). That contains the bulb itself, so if it is just a case of the bulb getting deteriorated, that should fix it right up. I guess it is also possible that the mount on the filter box is warped, which could also cause it.

    Bookmark   April 18, 2007 at 2:02PM
Thank you for reporting this comment. Undo
bill_kapaun

The gasket kit doesn't contain the needle AND seat. You need the carb overhaul kit for that.

Inspect the float. If it's hollow, shake it and listen for a "slosh". Silence is good. If solid, make sure it's not "fuel logged".

With the needle removed, pour a "bit" of gas in the tank to flush the line and hopefully any debris that might be lodged in the seat. Be safe etc. etc.
If that doesn't work, you'll probably need a new N&S.

IPL at the link in case you don't have it.

Here is a link that might be useful: IPL

    Bookmark   April 18, 2007 at 2:29PM
Thank you for reporting this comment. Undo
larryf

There should be a rubber viton seat for the Needle valve to close against. From your description, Fuel is flowing past the float valve and flooding the carburetor. You probably have some fuel flowing into the intake valve and crankcase area. Check the dipstick to see if the crankcase has fuel. The primer bulb is probably ok - it normally is an air pump that pushes fuel from the float bowl to the venturi area of the carburetor.

    Bookmark   April 19, 2007 at 12:16AM
Thank you for reporting this comment. Undo
ccecilm(6)

Be sure to read the needle and seat installation instructions. The "rubber viton seat" as mentioned by larryf probably needs to be installed in a specific direction. The seat will probably have a little depression all around it on one side and should be installed in the up (away from the float) position, the smooth side goes toward the float.

    Bookmark   April 19, 2007 at 7:33AM
Sign Up to comment
More Discussions
Craftsman ZTS 7500
Going to look at a used one of these tomorrow. Anything...
radlee30458
Reel Mower for Bermuda Lawn?
I was looking at the Fiskars StaySharp Max Reel Mower...
void.pointer
Bad ignition coil magneto on Tecumseh
Is there a more economical solution to replacing a...
don_v
need a mower
Hi. I'm trying to find a decent self propelled walk...
mjgarden1
I have a Tecumseh 5hp egine no spark
I measure the ohms from the following. I placed one...
Nutty1269
© 2015 Houzz Inc. Houzz® The new way to design your home™