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  1. #1

    Join Date
    Mar 2011
    Posts
    5
    Location
    New York
    Mower
    John Deere

    Primer Bulb Problem

    I have a Homelite weed trimmer model ST-155. Started having problems with it staying running and discovered the primer bulb was cracked. I replaced it and the new one won't pump any fuel up from the tank. I replaced the fuel lines and filter last year and they seem to be fine. I can blow into the fuel line and it will come running back out fine. I keep pumping it but no fuel comes up into the bulb. I took the carb apart and cleaned all ports out with cleaner and made sure every part went back together the correct way, but still no fuel. Any advise would be welcomed.
    Clayton

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  3. #2
    Sprinkler Buddy's Avatar
    Join Date
    Apr 2011
    Posts
    289
    Location
    Florida
    Mower
    60" 30 HP Hustler's

    Re: Primer Bulb Problem

    Sounds like your getting air and it's not self priming, make sure you haven't tightened the screws to much or not enough on your primer bulb.
    "This is such a Great Quote, I had to borrow it from a TBN member."

    "You can easily judge the character of a man by how he treats those who can do nothing for him."
    ~ James D. Miles

  4. #3

    Join Date
    Mar 2011
    Posts
    5
    Location
    New York
    Mower
    John Deere

    Re: Primer Bulb Problem

    Sprinkler, Thank you for the reply. I did tighten the screws down very tight. I will check that tomorrow after work. All points to a leak in the suction tube from the fuel tank, but I just don't think I have one. I blew down the tube and fuel came running back up the tube flowing freely. So this tells me the filter and tube is ok.

  5. #4

    Join Date
    Sep 2011
    Posts
    69
    Location
    Rowlett, TX
    Mower
    Honda

    Re: Primer Bulb Problem

    You need to replace diaphrams and gaskets in the carb. also replace the needle while you are at it, it is all in the rebuild kit. You shoul dbe able to find the kit for $11 or less.
    Lakeview Power Equipment
    Rowlett, TX
    972-475-9946

  6. #5

    Join Date
    Oct 2011
    Posts
    37
    Location
    Minnesota
    Mower
    Badboy

    I'm sure you just have the lines backwards

  7. #6

    Join Date
    Mar 2011
    Posts
    5
    Location
    New York
    Mower
    John Deere

    Re: Primer Bulb Problem

    I think the lines are correct as they are different size diameters and length. I will recheck them after work today. Thanks for the reply. If they are ok I will order a rebuild kit. Winter is coming on and I won't need it, so no big hurry.

  8. #7
    Sammy the Red's Avatar
    Join Date
    Sep 2011
    Posts
    299
    Location
    Southern/Lower Michigan
    Mower
    Grasshopper-John Deere-IH Cub Cadet-Woods

    Re: Primer Bulb Problem

    If it still primed when it was cracked, than you have not correctly installed the new one.

    I have replaced a couple of them, tho cracked, they still would prime.....Just a little messy !

  9. #8

    Join Date
    Mar 2011
    Posts
    5
    Location
    New York
    Mower
    John Deere

    Re: Primer Bulb Problem

    Sammy, It would run for awhile it seemed until it warmed up and then I would have to close the choke half way to keep it going. I thought it may be sucking air into the bulb. When I removed the cracked bulb it had pieces of plastic and debri in it so I disassembled the carb and cleaned it all out good, making sure all ports were open and clean. When I put it all back together with a new bulb it won't draw fuel up from the tank while pressing the bulb. I have had it apart several times to make sure all parts were correctly assembled and they seem to be. I didn't use new gaskets, so maybe that is the problem. I just feel it should at least draw some fuel when pumping it, but none at all comes up. Thanks for the replies, Clayton

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