Hi, I'm replacing the fuel lines in my weedeater blower/vac. This particilar carb has a primer bulb. Just to be sure, what lines go where? The bigger line went to the top of the carb next to the primer bulb (I think). The smaller line was directly underneath that, just below the primer bulb housing. Is the smaller line the one that gets the filter and is fed all the way to the bottom of the tank? And the larger one just enters the tank about a 1/2'' or so right?
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The primer does not necessarily need to work for the unit to run. It does have a choke to aid cold starts. However it is a good indication of something wrong in the fuel system. A primer bulb that does not return to shape or does so slowly indicates a clogged screen in the carb. Check the fuel filter and fuel lines. Replace the fuel lines if they are stiff or discolored, rebuild the carb and replace primer bulb.
No, it is a return line to the tank from the primer. It sounds like the hoses are reversed. The fuel should flow from the tank via the main fuel line (with the filter)( sometimes the main line is smaller than the return line) to the carb, fills the carb then to the primer bulb, and from the primer bulb back to the tank. With just enough fuel in the tank to cover the fuel filter start pressing the primer bulb. Check for fuel coming out the short hose into the tank. If instead the bubbles come out the filter and the primer goes dry try reversing the lines at the carb and/or the primer bulb and try again until you get the proper flow pattern.
Primer bulb has hole in it or fuel line cracked.First use needle nose pliers to crimp fuel line just before primer ,dont use to much pressure and see if bulb will hold vacuum when you press it.If it wont hold vac either buld has hole or valve in primer is defective.If it does then you need to crimp off fuel line feeding carb and see if primer holds vac.If it does not then you need to replace powervalve inside carb.
One line (the one with the fuel filter in the end of it) comes out of the fuel tank and goes to the bottom fitting on the carburator. The second line comes out of the tank and goes to the bottom fitting on the primer bulb. The third section of line goes from the top fitting on primer bulb to top fitting on the carburator. Hope this helped and best wishes.