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Bench testing fuel accumulators

Discussion in 'Technical Q&A' started by jacques, Oct 18, 2015.

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  1. jacques

    jacques Formula Junior

    May 23, 2006
    877
    Los Angeles/Florida
    #1 jacques, Oct 18, 2015
    I have recently acquired two used fuel accumulators. Is there a simple method of bench testing them so that I will know if they are worth saving as spares.My 1980 Ser.1 400i uses two of them, and as we all know,it's always nice to have back-up parts. Thank you all so very much in advance. Jq.
     
  2. theunissenguido

    theunissenguido F1 Rookie
    Owner Silver Subscribed

    Jan 21, 2004
    2,742
    Argent/Brasil
    Full Name:
    Guido
    #2 theunissenguido, Oct 18, 2015
    Last edited by a moderator: Sep 7, 2017
    There is a rubber diagram inside. If this is leaking, the accumulator want keep pression on your fuel system. Put some gas in the bigger tube and turn this on the upper side. Gas may not come out of the smaller tube.
    Guido
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  3. CaptOharry

    CaptOharry Formula Junior

    Jan 4, 2009
    763
    Green Cove Spgs FL
    Full Name:
    Harry Welch
    #3 CaptOharry, Oct 19, 2015
    Those should have a Bosch # on the Case.
    You can get them Brand New at Rock auto.com for around a Hundred Bucks.
     
  4. jacques

    jacques Formula Junior

    May 23, 2006
    877
    Los Angeles/Florida
    #4 jacques, Oct 19, 2015
    Thank you so much for the responses.. Very helpful. I'm not quite sure if this another part that is on the endangered species list. Jq.
     
  5. finnerty

    finnerty F1 World Champ

    May 18, 2004
    10,406
    #5 finnerty, Oct 21, 2015
    That will tell you if the diaphragm is bad --- but nothing about the spring.

    To test the spring (and the correct force maintained), refer to the WSM as there is an "on the car" test procedure and specification for both system pressure and hold time --- this test can also be done on the accumulator by itself (component bench test). You will need to rig up suitable fittings/hoses, a pressure gauge, and a method for applying the static fluid pressure.

    But, yes, if that is true ....... at $100 bucks for a new one, I cannot imagine it is worth the time and effort to test / re-use an old OE unit.
     

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