The ORG - No back-slapping boys club!
Started by SteveDuNord, 24 June 2023, 03:55 PM
Quote from: revilla on 02 July 2023, 08:50 AMHi Steve,Before you go into all that effort.Through several experiences when my CP=SP it ended up being the little oring inside the hex nut chamber inside the fuel pressure regulator. The one where you need to remove the famous clip that holds the spring to the main shaft. What I have seen is that oring is either loose out of its round slot or broken. When that happens the flow from the return line coming from the WUR gets blocked/clogged giving the CP=SP condition. It makes total sense. It can certainly be misleading to straight tackle the WUR. I've been there. But Your WUR is probably ok. Yes, it makes sense to recondition it with the kit and cleaning the aluminum cell plate. Yes, it makes sense checking your return line. Yes, it makes sense cleaning the screens (fuel input at FD, at fuel tank and the one in the WUR). Citric acid is perfect to dissolve all that brown/orange dust. Ultrasound can be used to for optimal results. I wouldn't pay a company big money and/or wait 5 weeks to get a refurbished WUR. No way.Chances are high that's your problem based on my own diagnosis with mine kjetronic systems. But of course it could be a combination of things.Good luck and keep us posted please.
Quote from: revilla on 03 July 2023, 11:05 AMI understand. Been there. You can do the following test. Put a rag to absorb the exiting fuel under the 12mm connection of the WUR return line on the side of the FD right to the left of the main return line. Run the pump by disconnecting the FD blue connector (key in position 1 but engine not running). Unscrew the 12mm nut a bit until you see the first drops of fuel. Pressure gage valve open (reading CP). Does your CP go down as you unscrew that nut?If yes, your problem come actually from the pressure regulator and not your WUR. Check that little oring is still in place. If id and od not correct it will pop out of its slot blocking the 3 holes where the fuel suppose to return to the tank resulting is a high reading of your CP.If after this test your CP remains high and no fuel exists that line, the problem is your WUR. That test will at least tell you where to focus your efforts.Good luck.Ps.: I've heard some of those pressure regulator kits don't have the right oring sizes. Worth checking the little one is still where it supposes to be.
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