I have replaced all fuel lines, primer bulb and fuel tank filter and carefully checked fuel pipes are the correct way round. The primer bulb exits fuel ok back to tank but will not suck the fuel through. Any suggestions please? There is a thin film like gasket inside the carb which seems to respond to presses of the bulb bulb I suspect. thanks Simon
SOURCE: McCulloch,Mac 3200 Chainsaw fuel lines...........
retgmdI need the same, did you ever find one?
SOURCE: Walbro WT891 carb on a
Who connected these hoses? the normal routing for a machine with a primer is like this, the fuel hose from the tank with the filter on the end goes to the carb fuel inlet nozzel ( not to the primer ) nearest to the pump cover ( cover on carb held with one screw ) the pipe from the metering side of the carb connects to the shorter nozzel on the primer bulb ( suction side ), the longer nozzel on the primer ( pressure side ) connects to the pipe going back to the tank, just remember the primer pulls fuel from the carb,into the bulb, and pushes it back into the tank, it is not actually a primer it is a purge. because it is connected this way it is impossible to flood the engine no matter how many times the bulb is pressed.
Let me know if it starts and runs.
SOURCE: My Craftsman 17cc gas weed trimmer wouldn't start.
Hi There, Check the primer bulb for tare or pin holes. Replace it. Check and clean carb jet it maybe plugged with debree. Also check for spark which you didn't say. Replace with correct plug.
Note; Do not use strong cleaners on rubber seals (O rings and gaskets) They dry up and crack.
If needed use a dabble of grease on seals
Testimonial: "Thank you. I had to merely add more gas to tank & bulb siphoned fine. Changed the plug and bingo! It started & runs great. "
SOURCE: I have fuel lines off
The primer pulls fuel from the carb, into the bulb , and back into the tank, there are two conections on the back of the primer, the shot conection is the suction side so connects to the carb, the longer conection is the pressure side, so this goes back to the tank, it just pushes into the top of the tank with nothing on the end, just a tight fit in the tank, the line from the tank with the filter on the end gose to the fuel inlet on the carb, nearest to the alluminium pump side cover normally held with a single screw.
SOURCE: When I pump the primer bulb, why doesn't it fill with fuel and stays collapsed?
new carbies start around $25.00 us on e-bay so get a new carby
take it to a mower shop for a service
rebuild the carby using a new carby kit
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