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How to route fuel lines for a weed eater GHT-17 type1 carb. It has only one fuel inlet on carb, its a walbro w1221a.

The fuel line is gone, it is routed inside the handle some how. There is only one fuel inlet on the carb no outlet for return and no primer bulb. The carb is a walbro Type 1 W1221A or WT221, which is obsolete. The replacement is WT379 which has a primer bulb and two lines run to it but I don't want to buy a new carb if the old one is still good. Inside the handle there were remains of two sizes of fuel line one went to the carb and the other looked like it drained out through a hole in the bottom rear of the handle.

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It would a WT-221. You got fairly right that one is a vent line and it does feed up into the handle and is vented out thru it; although, you may to add a check valve to it. I repaired a few of these and the ones I did all leaked out of the vent line until I added an Echo line vent to the vent line.
The problem I had was that the vent line not only allowed air into the tank, it allow fuel to escape thru the vent line when the tank pressurized.

Posted on Nov 16, 2014

Testimonial: "I could use a picture if you have one. How does the actual fuel line run to the carb? There are two holes in the handle one for the wires to the switch, which is about enough for the wires only and the one in the rear bottom of the handle. maybe the fuel line runs through with the wires and the other just drains out the handle's hole in the bottom. That seems like it could be dangerous to have fuel leak out like that."

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  • Eugene Rounds Nov 16, 2014

    Only the smaller of two lines will exit the handle where the wires exit. This will be the fuel supply line that has the filter attached. The vent line is just route up throungh the inside of the handle to near that exit hole.Just follow a path that doesn't interfere with the throttle control lever. I wish I could provide an actual pic but I don't of these trimmers in the shop. An tip here if you don't about it on getting the lines thru the tank holes. Cut a taper on the end of the lines and using tag wire inserted thru this taper and fed thru the one of the holes gently pull the fuel line thru.

  • Eugene Rounds Nov 16, 2014

    And boy I wish this site had better software....

  • clifford c hudson Nov 16, 2014

    Thanks for your input. I will take some pic's and try to load them. I saw a pic on, it shows the fuel lines from the tank just going to the rear to nothing and only the handle no engine or carb. Kind of vague but I guess i'll try to get it together and also get into the carb as well since i'm there. The carb will probably have chunks of the line in there anyway. r

  • clifford c hudson Nov 17, 2014

    I just tried to load some pic's of what I was doing. It took a long time. I have the vent line run but didn't have the fuel line handy so I will get that Monday. I hope they loaded and help some one.



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