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  1. #1

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    Aug 2014
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    Primer Bulb on M2500

    These Murray M2500's are junk. I get that. But this one is almost brand new. I back blew the fuel filter, replaced the fuel lines (which weren't bad). When you try to prime it, the bulb works fine until fuel starts going through into the carb. Then once it's full, the bulb won't come back out.
    Something is clogged in there, I just can't see where.

    Any help would be great. I've got a few of these like this.

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  3. #2
    primerbulb120's Avatar
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    Re: Primer Bulb on M2500

    Take off the fuel pump cover on the carb (held on with 1 screw) and replace the filter screen. It could be clogged, or it could just be malfunctioning and refusing to let gas through.

  4. #3

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    Re: Primer Bulb on M2500

    One screw? I guess I missed that one.

  5. #4
    primerbulb120's Avatar
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    Re: Primer Bulb on M2500

    The cover should say "Walbro" on it and have one Phillips screw in the center.

  6. #5

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    Re: Primer Bulb on M2500

    Quote Originally Posted by primerbulb120 View Post
    The cover should say "Walbro" on it and have one Phillips screw in the center.
    This one must have a different carb. Has two screws holding the primer. Those two are long enough to secure the fuel pump. I'm not sure what I cleaned out or blew out, but it's working now.

    Just wished I knew what I did, so I could do it again without having to go through it all. You know what I mean?

  7. #6
    primerbulb120's Avatar
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    Re: Primer Bulb on M2500

    Oh I'm sorry, I forgot you have the primer on the carb. The two screws holding the primer on are the ones you need to remove. Then remove the primer base and you'll be able to access the screen. On carbs that are set up for remote primer, there's only one screw.

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