I would ck. to see if you are loosing fuel preasure, another word is the fuel going back to the tank. But you say you replaced the accumilator. There is a ck. valve on the fuel pump, it is actualy the part that the fuel lines connect to, if the ck valve is bad fuel will return and give you similar prob. I've seen alot of this also you could have internal leaking distributor. If you push on the float is it wet in there? keep me posted on the outcome like to try to help out.

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MERCEDESDOC
85 500 SEL (us car)
EIBACH SPRINGS,
16X8 LORINSER DEEP DISH
225/50/ZR16
EURO LIGHTS
SEC GRILL
WHITE GAUGES
1ST GEAR START TRANS.