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The bulb is connected to the fuel and carb by two small hoses usually clear or yellowed from fuel..they get brittle and break causing it to suck air and loose it's ability to push gas into the carb...cheap cost but is a little tricky to replace account of close clearance but can be done..if not easy fix for dealer good luck
Initially release any clips by squeezing with a pliers and pushing back along the line. Lines can be prised off using a snipe nose pliers or flat blade screw driver, pushing on the edge of the line. Don't pull the lines which can stretch them.Two fuel lines leave the tank of a two stroke engine. The primer bulb sucks gas from the tank via the line with the filter on the end, gas returns to the tank via the other line without the filter. When you replace a line, to check whether they haven't been mixed up, fill the tank but leave the line without the filter above the level of the gas. When you push the primer bulb, gas should eventually squirt out the line without the filter. If the lines are mixed up, air bubbles will flow out of the filter and no gas out the other line.
For a pictorial guide and more info on troubleshooting 2-stroke engines and carburetors, see my guide here:
Did you mean "Can or Can't" get the primer bulb to fill with fuel? If you actually meant "Can't" then you probably have a pin hole or the bulb has a small crack in it which is sucking air into the bulb when you depress it. If that is the case, there is a metal flange that goes around the base of the bulb and probable 4 screws that holds/seals the bulb in place. Easy to replace and the bulb can be purchased at most small engine repair shops.
Run a small paperclip into the fitting that the fuel line is attached to on the back of the primer bulb and make sure it is clean. Then go to the other end of the equation and make sure that the fitting is cleaned out on the carb where the fuel line attaches. Hope this helps and good luck.
The line with the filter goes to the bottom of the carb. The other line goes to the outlet side of the primer bulb and the other line from the primer bulb goes to the top of the carb (The primer sucks gas through the carb).
Ps. if you are not sure which nipple of the primer is the outlet port then put your finger on one of the ports and push the bulb. If the bulb stays ridged then that's the outlet and if it collapses but doesn't fill but up then that's the inlet side.