can anyone help?

i really need a diagram of the fuel manifold for an 89 300e
i would settle for some really good advice.
i have timed spark and fuel but no run, good plugs, fuel questionable...how could i drain all fuel out of system and start fresh...i have already broke loose the incoming line to the manifoldand ran till till empty, then hooked it back up and broke loose the return line and ran about a gallon out, then ran gas into cylinders without plugs in , to try to drain lines. after all this we hooked it all back up tried to start and got what appeared to be 1 fire on a cylinder, but that was it, , what ever it was it was a difference from all previous tries to get running...we cleaned the spark plugs off again, blew out cylinders again, ran more gas into cylinders again, hooked all back up and tried to start and got what appeared to be a good fire, 1 fire on a cylinder...help