Quote:
Originally Posted by GerritDr
I loosened the inlet and outlet fuel connections on my WUR
I waited about 20 min
Then I fastened both connections again
Now I tried to start: car started immediately
And I also did not hear any squealing sound when pump primes before the start
So I am now trying to see whether vacuum is holding my plunger up after cooling down the engine
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The squealing is the typical sound of the injection nozzles!
I believe that you are correct about the drawback of the metering plunger.
Bosch went thru two steps of corrections to try to remedy that problem; first was the addition of a spring above the plunger, and when the aluminum fuel distributors were introduced a relief valve was added to the control pressure circuit.
That relief function is what you did.