Fuel leak under intake manifold/throttle body

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  • Falconer
    Advanced Member
    • Mar 2011
    • 156

    #1

    Fuel leak under intake manifold/throttle body

    Sometimes, warm or cold, it takes about 3 times to start. After that, it idles fine. I've noticed the smell of gas in the engine compartment, and today I finally caught it in the act (I think); it dripped onto the plug shown below. Everything under there is kind of soaked with gas in general. What could be leaking?

    1981 320is, Alpine White, 5 speed (Sold)
    1992 318is, Brillantrot, 5 speed (Sold)
    1996 328i, Montreal Blau, 5 speed (Sold)
    1991 325i Coupe, Alpine White II, 5 speed (Current)
  • efficient
    No R3VLimiter
    • Feb 2012
    • 3312

    #2
    Have you checked the fuel hoses?

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    • mitchlikesbikes
      E30 Modder
      • Dec 2013
      • 858

      #3
      this same thing happened to me, turned out that i had knocked the fuel rail loose from one of the injectors when i was prying around changing my thermostat housing. i would check your hoses and then see if the injectors are all seated/sealed properly

      1989 Coupe build thread: http://www.r3vlimited.com/board/showthread.php?t=312012
      IG: @mitchlikesbikes

      Comment

      • AndrewBird
        The Mad Scientist
        • Oct 2003
        • 11892

        #4
        DO NOT DRIVE THE CAR UNTIL YOU FIX THIS!

        That is an engine fire waiting to happen.

        Comment

        • Falconer
          Advanced Member
          • Mar 2011
          • 156

          #5
          Originally posted by mitchlikesbikes
          this same thing happened to me, turned out that i had knocked the fuel rail loose from one of the injectors when i was prying around changing my thermostat housing. i would check your hoses and then see if the injectors are all seated/sealed properly
          I swapped in M50 injectors last April, and checked the seating and seals a few weeks ago when I started noticing the raw fuel smell. I'm fairly confident it's not this but I'll check again.

          Originally posted by efficient
          Have you checked the fuel hoses?
          Yes, a quick examination in poor lighting didn't reveal anything but I'll probably have to take a closer look.
          1981 320is, Alpine White, 5 speed (Sold)
          1992 318is, Brillantrot, 5 speed (Sold)
          1996 328i, Montreal Blau, 5 speed (Sold)
          1991 325i Coupe, Alpine White II, 5 speed (Current)

          Comment

          • EatsHondas
            E30 Addict
            • Sep 2012
            • 404

            #6
            Not that many culprits to choose from. Check the rail and pressure regulator for cracks/leaking fuel, both fuel lines (don't mix them up if you remove them!), and the upper (rail) and lower (intake manifold) o-rings on the injectors.
            1989 325i Lachssilber Sedan
            5-Speed Swapped
            M30B35 Swapped
            MegaSquirt MS3X

            1987 325i Lachssilber Sedan
            260k OEM Automatic Daily Baby

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