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Thread: fuel filter change 3.9 v8

  1. 15th August 2013, 05:03 PM #1
    rangietragic's Avatar
    rangietragic
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    fuel filter change 3.9 v8

    I want to change the fuel filter on my sons d1.What is the easiest way to depressurise the fuel system?
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  2. 15th August 2013, 05:14 PM #2
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    Uglitom
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    Remove the fuel pump fuse and run the engine. When it dies, the pressure is gone.
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  3. 15th August 2013, 08:01 PM #3
    Dougal
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    No pump running and no pressure. I changed mine a few weekends ago, didn't have to depressurise anything.
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  4. 15th August 2013, 09:48 PM #4
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    Quote Originally Posted by Dougal View Post
    No pump running and no pressure. I changed mine a few weekends ago, didn't have to depressurise anything.
    Cos your pump is old and the check valve is full of crud?
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  5. 16th August 2013, 09:18 AM #5
    Dougal
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    Quote Originally Posted by bee utey View Post
    Cos your pump is old and the check valve is full of crud?
    Kick a man while he's down.
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  6. 16th August 2013, 11:33 AM #6
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    G'day,

    Look on common rail for fuel injectors (drivers side) on top of the engine.

    You will find a relief valve under the black valve cap. Looks remarkably similar to a tyre valve cap.

    Depress to relieve any pressure. (Watch out for petrol in the eyes!)

    Hope this helps
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  7. 16th August 2013, 03:02 PM #7
    sheerluck Guest
    Quote Originally Posted by Stumpy1 View Post
    ......Depress to relieve any pressure. (Watch out for petrol in the eyes!)

    Hope this helps
    And make sure you mop up spilt fuel (normally collects on top of valley gasket, melting the composite coating on the gasket if left long enough).
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