Greetings Forum Members,

I think that I found the problem causing the poor running of my 1985 280sl, sooty tail pipe deposits and spark plugs, as discussed in previous posts.
HERE'S WHAT I'VE GOT;
Dead head fuel pump pressure over 8 bar.
Fuel system pressure 5.3 bar.
System holding pressure after engine shut down approximately 2 bar over 30+ minutes.
Steady system vacuum.
The WUR is receiving 13V from the plug.
The WUR electrical receptical resistance is 28 ohms
BUT my fuel control pressure reading does not rise higher than .7 bar after warm up.
It used to go to 2 bar before I screwed the WUR adjustment bolt in a couple of turns not realizing that this would reduce not raise the control pressure.
I have concluded that I need a new WUR or fix the existing one.
Can they be repaired without replacing components?
Exactly what fails in these units? Do the springs eventually fatigue and loose pressure over time?
Will tapping the pressed in pin holding the heated bimetal spring revive my control pressure readings?
We're getting top down weather here in the NE now and I'd like to be able to enjoy it driving, not just parked.
Opinions please, a new WUR isn't cheap!

Thanks,

Knarf

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72 350SL #69
73 450SL Parts Car?
78 450sl Parts Car
79 450SLC - Sold
1985 280sl
87 190E 2.6 - Donated
90 300E-Junked
97 E420