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Thread: RB30 Facts, Figures and Helpful Hints

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  1. #11
    Patrol God mudnut's Avatar
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    FUEL TANK BREATHER

    Doh! How silly am I. Have had problems with the fuel tank having a vacuum created as the fuel is used. Put it in the too hard basket for a while. I read recently that a vacuum created in a fuel tank is not a good thing, as it flexes the tank in a way it is not designed for. This can cause it to crack. Got off my lazy bum to have a look at it today and I found that the breather for a '94 is in the fuel cap.

    I did the test as set out in the FE section of the workshop manual (EF & EC page 44). It says to check that the operation of the vacuum relief valve, which is in the cap. To test: suck on the cap and there should be a click, or valve noise. It also says that if it is blocked, to replace it

    I found that it was blocked, so being a tight wad, just whacked the shop vac on the cap and turned it on.

    Amazingly it worked and now the valve acts as it should, and lets air in and none out.
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    Last edited by mudnut; 21st August 2017 at 08:22 PM.
    My advice is: not to follow my advice.

  2. The Following User Says Thank You to mudnut For This Useful Post:

    dom14 (12th November 2017)

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