Hello. I am trying to find an answer for a problem which sounds simple, but did happen complex enough to me. My friend's car is w115 benzine 200.4 (1971). The engine starts and runs smooth and properly. Unfortunately, when we load the accelerator, the engine suddenly stops running. The benzine can not meet the need. After waiting some seconds, it tuns again. We changed all the hoses and the pumps. We even adjusted the carburetor several times, but the result is same. I would be more than happy to hear any suggestion.

Thanks in advance.