>The tests you did with the system open, did they last more than a few seconds?
Yes, I attempted to pump fuel out of the injection line for about 5 to 7 seconds. I did not remove an injector, so I cannot yet say how much fuel pressure the system is delivering to the manifolds.
>Do the symptoms change if you remove the gas cap?
No, I already suspected a clogged vent and removed the cap. The fuel pump seems to be delivering plenty of volume.
>What happens with a little bit of ether?
I did not try ether. I don't have any, and I'm hesitant to try. I'm assuming ether in the intake manifold would suplement the need for gasoline temporarily.
>The test you did for cylinder 6, that was at the injector end of the line, not the pump end, right?
It was the end of the injection line, but disconnected from the injector itself.
>Have you checked your oil recently? Do you suddenly have a lot more of it?
Actually, oil was down about a quart. I burn 1 quart per 1K miles. I added oil accordingly and the oil on the stick has the viscosity of SAE30, no gasoline dillution.
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My next check, since you say you're getting fuel there, would be to check for power at the cold start valve. you can also check for power at the cold-start solenoid on the injection unit.
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I don't think it has a solenoid on the injection pump for cold starting. The CS valve has the solenoid on the intake manifold itself as the fuel supply T's off to the valve before it enters the intake on the injection pump.
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They mention a fuel cut-off solenoid for stopping fuel delivery during coasting but there's no picture.
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I may look for that one. I do not have a shop manual specifically for the injection pump, just the Mercedes shop manual.
Thanks for the suggestions!