Walbro problems or engine problem?

[MrUnlimited]

Guys:

I have a problem: when I prime the bulb it fills halfway and then it pressure the fuel though the airtube back to the tank. Engine will not get any fuel and won't start. I tried it with the stock Carb and the WT813. Both have the same problem. Both carb needles are set to 1,5 turns on both the carbs. Is the carb the problem or there something wrong with engine? All gaskets are almost new so I don't think it is an airleak. Someb ody has the answer?

 

[sperera]

loosen the fuel cap and try, mine does this when the engine is hot, caused by pressure in tank.

 

[MrUnlimited]

So you think it is a vacuum problem?

 

[pablo]

having the same problem myself i got a brand new carb and the fuel bubble filled up but its still hard to start and runs like a crate,

 

[MrUnlimited]

Did you solve it and if so how?

 

[voo2doo]

loosen the fuel cap and try, mine does this when the engine is hot, caused by pressure in tank.

+1 with Sohan,a couple of mine do it ,so I vented the cap with a bleed nipple off a 1/1 car brake and some tube,works a treat.
j

 

[Timmahh]

are you POSITIVE your not getting fuel to the motor?

how does the plug look? does it look Wet at all?

is it Dry as a bone?

if you think your not getting fuel. take the plug out of the motor, dip the end into the gas tank to get it wet with mix fuel. re install and pull. it SHOULD fire over. If it does POP, then you are correct in thinking no fuel is getting to the motor. you have a fuel delivery issue (carb, bad manifold gasket, bad cylinder gasket ect..).

but if it does nothing, then you still may have a fuel delivery issue, but you may be flooded, instead of dry.

if nothing works, id suggest you take the motor out, and start looking at the gaskets as well as the carb area and maybe even inspect the walls of the cylinder.

 

[pablo]

Did you solve it and if so how?

going to clean the vent hole on the filler cap and try it out at the weekend,