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Thread: Strange WUR behavior

  1. #1
    Junior Member
    Join Date:  Nov 2019

    Location:  Lake Tahoe

    Posts:    9

    Strange WUR behavior

    I've never seen a WUR fail this way. I'm curious if anyone else has.

    Cold engine. Fuel Pressure tester valve open (control) . Run fuel pump and I get 12PSI (its 32F today). If I close the valve I get 75 PSI primary. When I switch back to control pressure at this time I get a steady 65PSI. If I release system pressure and do the test over. Same thing. pump running at 12 psi. switch to primary and I get 75, switch back to control and 65 every single time. Inlet screen is not plugged.

  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,829

    My VIN:    03572

    I've never tested control pressure without the engine idling. I think your 12 PSI is good and so is your 75 PSI.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #3
    Junior Member
    Join Date:  Nov 2019

    Location:  Lake Tahoe

    Posts:    9

    Quote Originally Posted by Bitsyncmaster View Post
    I've never tested control pressure without the engine idling. I think your 12 PSI is good and so is your 75 PSI.
    But the 12 control is 65 once you switch to primary and then back to control. Doesn't make sense.

  4. #4
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,829

    My VIN:    03572

    Quote Originally Posted by Outwesty View Post
    But the 12 control is 65 once you switch to primary and then back to control. Doesn't make sense.
    I bet if you press the air plate the 65 would drop back to 12 again. So with the engine running you would not see that 65 PSI.
    Dave M vin 03572
    http://dm-eng.weebly.com/

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