can anyone help?

:shakehead i really need a diagram of the fuel manifold for an 89 300e,
but 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 manifold and ran into a can untill tank was empty, then hooked it back up and took off return line and ran it into a can for a while, then ran gas into cylinders without plugs in to try to drain lines, after all this we got 1 hit on 1 cylinder ( not #1) just a cylinder, or at least what appeared to be a hit, whatever it was it was different, so we cleaned the plugs again and ran more gas into cylinders untill we thought it was all out (bad gas?), blew air into cylinders to dry out again, put it all back together tried to start got 1 fire? again......help