Car shuts off after 15 min gives code po335

There is no way to push start an automatic transmission equipped CLK 500.

I agree that the fuel relay is likely the problem.

usually one adds tran fluid thru dipstick tube, why would this be any differant ? with car on level surface, having not been running in the last 30 min., warm engine to normal operating temp., 5 min., pull out dipstick to see where level of fluid is, have aclean rag, donot get this fluid on car paint, be careful. wipe off stick, put back in tube, be sure its in all the way, pull it out again, see level on stick, if below fill line , add the recommened fluid type using a funnel, a little bit at a time, shot glass at a time, recheck level w/stick, DO NOT OVER FILL, OK! ( HOPE YOUR CAR HAS BEEN RUNNING THE ENTIRE TIME )

Sounds like the crankshaft position sensor needs to be replaced. They are a common problem with the Mercedes. That sensor is the one that the engine control module looks at to see if the engine is running. When they get hot and stop producing a signal the engine control module thinks the engine is not running and shuts of the fuel. After waiting awhile they cool down and the vehicle will start up again. I've changed many of them when I worked at the dealer. Tricky part is when there working and the car is running there will be no check engine light on or code stored. Usually will only have the code when the car won't start. Let me know what you end up finding out on it but that would be the first place to look and probably the cheapest.

http://www.benzworld.org/forums/ ask the professionals that own the same car as you do. They will give you a solution.

5/30 fully synthetic....

MB dealer only.

Need to have the key in the accy ( or run ) position.

On the Cassette version, there is a CLK button on the right side of the radio face, press this, and then use the seek button to increase / decrease the time. Pressing CLK again takes it to the min setting, Do not press a button for 10-15 seconds, and the display will return to normal.

single CD, CD changer, and Cassette /CD changer versions, the RDS button is what is used to get to the time setting, using the select button to change the hours, press RDS again to get to the min.

RUN down to Advance Auto Parts and buy a can of "SeaFoam" and add to your gas tank per instructions...drive for at least 100 miles and the problem should be gone. If not, one or more of your O2 sensors are most-likely fouled (lousy fuel quality these days).
Good Luck

is the check engine light on? if so this will lead you in the right direction once you get the code.