Some of you may remember that I posted about a ’91 300SE that I bought as a parts car for my ’82 300SD. The problem is that the ’91 is just too nice for a parts car—the interior is immaculate and the underbody is free of rust—just too nice.
However, the SE doesn’t run. It sat for several years, and the gasoline turned to molasses. I removed and cleaned the tank and replaced the fuel filter and pump with new ones. I get 85 psi from the fuel pump to the engine bay.
Now, first off, let me be sure I am using the correct terms---
The “fuel accumulator” is the can with a spring-loaded diaphragm and is located near the fuel pump and fuel filter.
The “Fuel Pressure Regulator” ( FPR) is another can with a spring-loaded diaphragm, but it is located in the engine compartment, next to the Fuel Distributor.
Is that much correct?
By the way, the engine runs very smoothly if I pour some gas into the intake manifold/ air meter, so I am assuming that ignition and mechanical condition of the engine is not the problem.
With that 85 psi going into the FPR, I see nothing at the Fuel Distributor. Am I correct is believing that mans the FP is bad?
Is there any way to test them—using either vacuum or air pressure? I can pull another one from a junker at the local automotive dismantling and recycling center, but how can I be sure it’s a good one? I don’t mind buying a new FPR AFTER I know that everything else is good. There is just no end to the $250 to $300 parts that you can throw at these things. I’d like to have some confidence that “this” will fix it, but until it runs long enough to test drive, I am hesitant to spend that cash.
Is there a way to test them?

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags