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One more idiot question

Discussion in 'Technical Q&A' started by LW RedTR, Feb 18, 2006.

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  1. LW RedTR

    LW RedTR Karting

    Jan 12, 2006
    173
    California
    #1 LW RedTR, Feb 18, 2006
    First time filling the gas on my 87 built, 88 TR. When I took the gas cap off, a fair amount of pressurized vapor exited the neck. I had been driving for a few miles before that. Is this normal, or am I getting back pressure that isn't normal from the fuel tank?

    Car seemed to run just fine after the refill. Mostly just want to make sure I'm not missing something I should know about.
     
  2. thibaut

    thibaut Formula Junior

    Feb 28, 2004
    530
    London, UK
    Full Name:
    Thibaut A.
    #2 thibaut, Feb 18, 2006
    My 550 does that as well. pressurised tank. no worries.
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,104
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #3 Rifledriver, Feb 18, 2006
    Its a sealed system and designed to relive the pressure over a pound or two but when empty, as large a tank as it is, 2 lbs is a lot of volume coming out.
     
  4. ferrarilou

    ferrarilou Formula Junior

    Apr 13, 2004
    513
    US
    Full Name:
    Lou Menditto
    #4 ferrarilou, Feb 18, 2006
    When I had this symptom, the charcoal canister (fuel vapor recirculation) had clogged. A new canister solved the problem.


    Lou
     
  5. Verell

    Verell F1 Veteran
    Consultant Owner

    May 5, 2001
    7,022
    Groton, MA
    Full Name:
    Verell Boaen
    #5 Verell, Feb 18, 2006
    The K-Jet system like most other fuel injection systems built in the '80s regulates pressure by bleeding off excess fuel back into the tank. The circulating gas picks up heat from the pump, & engine compartment, thus eventually warming up the entire tank. Result is the pressure in the tank rises by a few pounds until releived as rifledriver mentioned.
     
  6. LW RedTR

    LW RedTR Karting

    Jan 12, 2006
    173
    California
    #6 LW RedTR, Feb 18, 2006
    Got it. Thanks very much.
     

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