I have the same re-start issue several people have mentioned. My '75 450sl misses and may not re-start at all when the engine is hot. It takes 15-20 mins for it to occur after being turned off and another 30 mins for it to be able to start again--and it's rough until reaching road speed. The car has also simply stalled on a warm day. The fuel pump is brand new and the lines checked. I've stumped two mechanics with the problem. A third has indicated that there may be a problem with fuel pressure dropping after shut-off and needing time recover. This differs from any other diagnoses I've seen. Does this sound plausible? Given that this problem seems to be somewhat common, is it really fixable?