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Weedwacker trimmer primer bulb collapses when pushed and does not return to i cannot prime the trimmer.

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Replace the primer bulb.

Posted on May 02, 2017


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Sorry do not think you will find a schematic, however this is how it should be, the Mondo has a remote primer, so there are three pipes, a thin pipe with the fuel filter on the end in the tank goes to the carb connection closest to the alluminium pump cover held with a single screw, the other connection on the carb goes to the back of the primer on the shorter of the two conections ( suction side ) the longer connection on the primer ( pressure side ) goes back to the tank, this is the return pipe, so remember the primer pulls fuel from the barb, into the bulb and dumps it back to the tank, it does not push fuel into the carb

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Need to replace fuel lines....does the prime bulb connected to return fuel line or the supply fuel line

Hi stglass900...

Normally the big line will be the line the fuel filter is connected to inside of the tank, and is connected to the primer bulb.
The smaller of the two lines is the return line to the fuel tank from the carburetor after it is pumped thru the carburetor by the primer bulb.
Please take time to rate me

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I have a Craftsman Weedwacker 25cc 358.791030 that won't start. Primer bulb is not getting gas. Gas line is connected to the filter resting at the bottom of the gas tank. The line for the primer bulb...

that line should be longer, it contains the filter which is the pick up, and should rest inside the tank fully,, see if its possible to pull that line farther into the tank, its not going to start until the primer bulb fills

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Bulb on primer collapses. which line in gas tank does the filter go on?two tubes in tank one goes to bulb other goes to bottom of carb which one gets the filter, it fell off

The line that goes to the bottom of the carb has the in-tank fuel filter. That is the fuel supply, the one coming out of the primer base assembly under the bulb is the return line. That line carries air mixed with old fuel back to the fuel tank when the bulb is pushed.

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Have 2 gasoline inputs to my walbro carbrator. The one on the bottom closest to the diaphram side leads to the prime botton. The one on the otherside leads directly to the gas tank. When the prime button...

Sounds like you have the lines connected incorrectly. Make sure that the bottom of the carb is connected to the inlet side of the primer (take the lines off and with one of the ports covered with your finger push the bulb, if it collapses and doesn't return then that's the suction/inlet of the bulb). The other side of the bulb needs to be connected to the gas tank. The other side of the carb needs to go to the filter side of the gas tank.
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Problem with primer bulb

Reverse the line connections at the primer bulb. Look carefully, the long port has the line going to the tank, the short port on the bulb will connect with the fuel line to the carb.

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