Fuel Tap Suck

Discussion in 'Technical Help' started by Triumphant Tony, May 6, 2023.

  1. Triumphant Tony

    Triumphant Tony Active Member

    Jan 30, 2023
    70
    28
    Western North Carolina
    #1 Triumphant Tony, May 6, 2023
    When putting my bike back together I noted that the vacuum line to the fuel tap fit pretty loosely. After running around beautifully for a few miles the bike stalled and would only run if the fuel tap is set to prime. I was about to order a rebuild kit, but it occurred to me that the problem might be that loose vacuum line. So my question is.... Could a loose or possible fallen off vacuum line cause the tap to not function and starve the carbs of fuel?
    1995 Trophy 900
     
  2. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,427
    800
    Yorkshire
    #2 Pegscraper, May 6, 2023
    In a word, yes. Vacuum operated fuel taps became quite common back in the good old pre-EFI carb days. A leaky vacuum line could also lean out the fuelling, potentially affecting engine idle.
     
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  3. Triumphant Tony

    Triumphant Tony Active Member

    Jan 30, 2023
    70
    28
    Western North Carolina
    #3 Triumphant Tony, May 6, 2023
    Excellent point about leaky vacuum line. Doh! Must have fried my brain yesterday.
     
  4. sprintdave

    sprintdave Nurse, think it's time for his medications.
    Subscriber

    May 25, 2014
    1,622
    750
    Birmingham
    #4 sprintdave, May 6, 2023
    Also check you haven't kinked the fuel pipe as it can cause a blockage, easy done. Yep I have been there.
     
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