Topped off gas tank--Won't start 4 days.

Topped off gas tank--Won't start 4 days.
Engine (http://www.benzworld.org/forums/newthread.php?do=postthread&f=26#) stumbled and died about a mile from gas station.
Got car towed to house. Has been in garage 4 days
with gas cap off, hoping for some sort of evaporation.
Still won't start--4 days.

Tried to siphon gas out. No go.
Seems to be something in fill pipe blocking siphon hose.

What to do ?
How to repair --get car started?

Thanks

Looks like you are already trying a crank sensor. A failed sensor will cause no spark, no injector pulse, and depending on model no fuel pump operation. If you don't know how to check these, try looking at your tach when cranking. If it doesn't move at all it is not getting a signal from the crank sensor.