Trouble starting a 92 190E 2.6

[bobbyrae]

After this car finally starts, it runs and restarts just fine - it's the first start of the day that is so tough. A friend believes that it's the idle mixture screw (accessible from top of air cleaner). He says it has to be tweaked just right to get the car started and then readjusted after it warms up, making it wrong for the next time the car is cold.

The process is tweak screw, try to start, tweak screw, try to start, over and over for about 5 minutes till it finally kicks over. He is convinced it is matter of getting the screw just right. I am convinced it has nothing to do with the idle mixture screw, but is probably fuel pressure not building up quick enough.

Any ideas? What does it cost to replace the fuel pump? Online parts sellers indicate there are 2 fuel pumps required - is that right? Or maybe some cold start mechanism is off?

Thanks
Bobby