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Pulsa jet carby

Discussion in 'Mechanic and Repair' started by lawn6@bigpond, Jan 11, 2006.

  1. lawn6@bigpond

    lawn6@bigpond LawnSite Member
    Messages: 61

    Have this problem with this Briggs engine mod 130902 with a pulsa jet carby . That won't pump up fuel from the tank .

    It has got a new needle & set kit and diaphram kit in it still nothing .

    When I put some fuel in the throat of the carby it starts and by dripping the fuel in I can keep it running for a couple of minutes.

    any ideas??
  2. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Did you do the rebuild to the carb? If so, did you use compressed air to blow out all passages/etc in the carb? How about the fuel filter on the end of the pickup, is this new or in ok condition?
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    If both the fuel pickup tube screens are clean and the diaphragm is installed properly (spring in right place) the only thing I can think of is possibly the fuel inlet port is plugged. It is a small hole in the carb. body under the main jet in that slotted area.

    Good Luck
  4. lawn6@bigpond

    lawn6@bigpond LawnSite Member
    Messages: 61

    Have gone through that has be said . No blockage can be found everything looks to be in place . Althrough a black O ring in is on the outof the needle under the screw spring.

    Still starting by putting fuel down the carb so it has to lack fuel.:confused:

    There a is nothing under the needle seat it just screwed straight in should there be a washer or anything there ??
  5. newz7151

    newz7151 LawnSite Silver Member
    from Tejas
    Messages: 2,419

    Hmm.. the upper resevoir in your gas tank didn't happen to have rusted away and fallen off, has it?
  6. Grassmechanic

    Grassmechanic LawnSite Silver Member
    Messages: 2,697

    The diaphram may need to be "pre-loaded".
  7. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Messages: 3,711

    most of the time its the pickup srceen is dirty and the upper resivour needs cleaning out. i hate these carbs.
  8. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Here is a Break-down of your carb., It should have 2 reference number 148 washers and 1 reference number 116 packing they call it. Without this the carb. could suck air around the adjustment screw and cause a lean run problem, Also only open the adjuster 1 1/4 to 1 1/2 turns open for the first start up then adjust as needed for smooth operation.

    Is this the same engine you adjusted the valves on ?
    Will it start if you hold your hand over the neck of the carb. ?

    Attached Files:

  9. lawn6@bigpond

    lawn6@bigpond LawnSite Member
    Messages: 61

    Restrorob: Yes same as the valves was done . No it want pickup if hand his over the carby . The owner had put the carby kit in and what eles they play with got no idea.

    Will check those washer , It does seem to be sucking air causing it not to pickup fuel .
  10. lawn6@bigpond

    lawn6@bigpond LawnSite Member
    Messages: 61

    Have now tried putting a cloth round the top of the carby and it will start and run of a bit but won't start on is own.:)

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