Fuel Leaking from carb on airbox side

[tproteau]

one carb is leaking fuel to the air box side the carbs have been apart and cleaned twice. The float seems to be moving free and the second time I had the carbs apart I switched the float valve and the seat with the ones from another carb and the carb still leaked fuel. The motor is being run without the air box on. Anyone have this happen before or understand what could be happening?

 

[spr5088]

May sound like a silly question, but are the drain screws in correctly/deep enough?

 

[tproteau]

May sound like a silly question, but are the drain screws in correctly/deep enough?

yes unfortunately, I wish it was that easy

 

[rxrenagade]

Sounds like a stuck float, try tapping on the carb bowl with the plastic end of a screwdriver. If that don't work, looks like you need to clean it again or possibly need a new float needle and seat.

 

[tproteau]

Sounds like a stuck float, try tapping on the carb bowl with the plastic end of a screwdriver. If that don't work, looks like you need to clean it again or possibly need a new float needle and seat.

the floats are moving freely and the needle and seat from another carb were put into the one leaking fuel the symptoms stayed with the same carb

 

[tproteau]

seems like the fuel is rushing out the main nozzle and that screw on the right front of the carb. only when the choke is off though.

 

[tproteau]

Is it possible for a float that moves freely on the work bench to get stuck while on the machine?

 

[Redbeard]

Replace the o-rings on the main jet nozzles. Might as well look your float bowl gaskets over too! Ethanol and time destroy them.

Fuel leaking around the drain screw story: A friend of mine gave my son a PW 80 dirt bike that had been sitting for God knows how long! I re-built the carb, it ran fine, but fuel leaked from the float bowl drain screw. I finally determined the end of the screw had been eaten away (rusted) from being exposed to water and crap in the float bowl. I ordered a new screw, put it in and the problem was gone. Hopefully that will fix your problem and the corrosion has not eaten into the float bowl seat too.

 

[tproteau]

Replace the o-rings on the main jet nozzles. Might as well look your float bowl gaskets over too! Ethanol and time destroy them.

Fuel leaking around the drain screw story: A friend of mine gave my son a PW 80 dirt bike that had been sitting for God knows how long! I re-built the carb, it ran fine, but fuel leaked from the float bowl drain screw. I finally determined the end of the screw had been eaten away (rusted) from being exposed to water and crap in the float bowl. I ordered a new screw, put it in and the problem was gone. Hopefully that will fix your problem and the corrosion has not eaten into the float bowl seat too.

I think it's actualy the o rings on the needle seat, main jet o rings still look to be in good shape.

 

[Redbeard]

Hope that fixes your issue.