Good evening!

I was prowling around here and found your question.

I can't see where the carbon build up stopped fuel delivery through the accel pump output tube.

In any case what may have happened is the the little lever on the side was missaligned on the "throttle lever" or just stuck in the up position not allowing the pump to prime.

Also, don't forget that there are TWO accel pump check valves, one for the gosinta and one for the gosouta. If one stuck in the most inoportune position, that would cause the same symptom.

Another thought is that if they were rebuilt, and the diaphragm was left out of the fuel for a short while, it warped and luckily it came back to life. Generally if they do dry out, ain't no fixin it , 'cept for remove & replace.

Probably it was a lever thing and taking the car out on the road and tromping on it freed it up.

Happy MB motoring!!

Mike