sunny sport 50 dripping gas from belt cover By tillman (Read 1,476 times)

[tillman]

Just purchased a 50cc Sunny Sport scooter 2 weeks ago. Was running fine then my son took it for a ride, comes back and it's leaking gas from where the cover goes over the belt area. Would not start back up. Continue to drip for several days, most of the fuel in the tank leaked out. I checked the bottom of the tank and the lines I could see and they were all dry. Scooter restarted and after a few moments started leaking gas again. Not sure where to start looking.

[kz1000st]

Two pronged issue. The gas petcock is only supposed to open when the engine is running. Second, the float in the carburetor is supposed to hold the needle closed and keep gas from running through. I had the same issue on a 650 Kawasaki and found about two gallons of gas on the floor one morning. Ethanol globbed up in both and held the parts open. I put in a heavy amount of fuel system cleaner and went for a good, long ride. That fixed its wagon.

[Alleyoop]

Check the Bowl Drain Hose which usually hangs right in front of the CVT cover. Now some carbs come with the Shoot off drain screw on the end of the HOSE and some the drain screw is built onto the carb so check that.

If that is ok then see if the Petcock on that scooter actually screws onto the tank. They sometimes tend to leak there if they are a little loose and it will run down the hose or just drip down so just tighten it up.
Alleyoop
THIS CARB HAS THE DRAIN SCREW BUILT IN THE CARB NEXT TO THE DRAIN HOSE:


THIS CARB HAS THE DRAIN SCREW ON THE END OF THE DRAIN HOSE:

[tillman]

This is awesome. Thank you. I will look at the connections tomorrow. It's odd, both scooters did the same thing after my 19 yo took them for a ride. I'll be getting new hoses, fuses and plugs for both tomorrow and doing a pdi.

[Alleyoop]

The scoots must have the one like in the second picture the drain screw on the end of the drain hose. They TEND to vibrate loose and you start dropping gas. If so tighten the screws up and put a little bit of SILICONE on the screw and the holder so it does not vibrate loose. Some folks the screw vibrated all the way out and was lost and gas was just pouring out.

Since it is only a drain hose if the screw is lost and do not have time to get one right away just bend the hose up and zip tie it nice and tight.
Alleyoop

[Cruiser]

Sept 29, 2012 8:58:31 GMT -6 kz1000st said:

Two pronged issue. The gas petcock is only supposed to open when the engine is running. Second, the float in the carburetor is supposed to hold the needle closed and keep gas from running through. I had the same issue on a 650 Kawasaki and found about two gallons of gas on the floor one morning. Ethanol globbed up in both and held the parts open. I put in a heavy amount of fuel system cleaner and went for a good, long ride. That fixed its wagon.

I agree partly with KZ. When the engine is off, the fuel petcock should prevent any gas from flowing since it opens only when vacuum is supplied by the running engine. However, when the fuel drain is open, the float will drop and the needle valve will open allowing gas into the carb. So, if more gas than what the float bowl will normally hold comes out of the carb when the drain is open, the fuel petcock is leaking. It could be stuck open or "globbed" up with foreign stuff.

If the float needle is in good condition then the gas flow into the carb will be stopped even if the petcock leaks once the operating level of the fuel is reached in the float bowl. It's possible to have a bad petcock and not even know it as long as the float needle works.

[Alleyoop]

Well we are all guessing as to WHAT is leaking and until Tillman finds where it is leaking then an appropriate fix can be made. For all we know it could just be leaking by a bad connection of a hose, either on the carb,petcock or fuel filter. So the jury is out until the leak is found, it could also be a loose carb bowl. If it was flooding it most likely will get into the AIR BOX which by the way is over the CVT cover, so that is also a possibility.
Alleyoop