My accumulator is a new one ,The was nothing wrong withb the old one .As changing it proved this point.

Same as what happened to me when I changed the fuel pressure regulator after I read that fuel visible in the clear overflow tube meant is was NG. It had been that way for 10+ years. Waste of money.

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1988 300E

Did you run the simple accumulator internal leak test I described in threads I started about a year ago? See post #10.

I think some confuse the accumulator and pressure regulator and may not even be aware of the accumulator or understand its purpose. The accumulator is co-located with the pump(s) and filter. under the floorpan ahead of the LR wheel.

Any leak in the accumulator diaphragm probably starts out small, but will get worse with time. Initially the hot and cold staring problems may be intermittent, but as the leak gets worse, so will the hot and cold starting problem.

My hard starting happened internittently a few times, then went away for a couple of months, then came back with a vengence. That's when I figured out I could easily test the accumulator for internal leakage. It clearly had an internal leak, and replacing it brought both hot and cold starting back to normal.

Duke