I am replaceing the primer bulb on my chainsaw 39cc and the hoses were rotted off , I find the bulb has a hose that goes to the carb and one hose goes to the gas tank but the third hose comes from the tank , where does that go to ????
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if it has a primer bulb , the line probably goes to that
It may you to consider a new fuel tank as they come with all hoses , new cap , line filter in the tank
The hose is not plastic but a silicon hose which although short is very expensive plus the fact that you have to get it through the stopper in the tank ( which is probably leaking as well)
I have just replaced the tank assembly for a ryobi 25cc trimmer for $40.00 aud and I feel sure that you will spend almost that in replacing the lines , in time
Are you sure you have conected the pipes the correct way round, the fuel hose from the tank with the filter on the end goes to the main fuel inlet on the carb, nearest to the alloy pump cover, the other conection off the carb goes to the shorter conection on the back of the primer, the longer pipe on the primer goes back to the tank, just remember the primer pulls fuel from the carb, into the bulb, and back to the tank.
Primers on chainsaws/brush cutters pull fuel from the carb, into the bulb. and back to the tank, the short pipe on the primer is the suction side, this goes to the carb, the longer tube on the back of the primer is the pressure side, this goes back to tank, the fuel hose from the tank with the filter on the end goes to the fuel inlet on the carb
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.
Your primer bulb must have 2 lines coming off.One goes to the tank and one to the carb.If it doesen;t it must have broken off.if so it needs to be replaced the bulb will say tank and carb on the back of it.In very small letters.
Without seeing your saw it is difficult to visualize. There is usually an overflow from the carburetor back to the fuel tank. I suspect that is your third hose. Lou
This is the same problem I have with a Mac 3200. I have: (1) A line from the primer bulb to the front port on the carburator. (2) line from fuel tank, with attached fuel filter, to the other primer bulb port. (3) Line from port on back of carb. to ????. I thought it must be a pulse line, but not certain, and don't know where to run it to. Please let me know when you find out.
This post helped me with my McCulloch Mac 3216 chainsaw. There are two holes in the gas tank - one above the other. One is for the gas line (with the filter on the end) and the other is for the overflow - a simply line that runs from the "out" nipple on the primer bulb into the gas tank. The filtered fuel line goes to the nipple on the back of the carb. Another short line goes from the "in" nipple on the primer bulb to the nipple on the front of the carb.
There are two notches just out from the two holes in the gas tank for holding the lines that go in -- this may help you locate the holes.
I found it helpful to pull the lines that go into the gas tank out through the gas cap hole and leave them hanging out until the housing was reassembled. I also left the lines that plug into the primer bulb hanging out through the hole where the bulb goes until the housing was put back on. Leave plenty of extra line for the lines going out to the primer bulb. Once the housing is in place, cut the lines to the primer bulb and attach them, and slip the lines into the tank, making sure the ends are as far down in the tank as possible. You will need this extra "slack" to work with the housing to get it back on.
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