No start

I recently purchased this van on good faith. It ran fine, no odd smells, no strange noises or anything ran just like it had come from the factory (actually).

I pulled Into a driveway, left the van to idle for approximately two minutes. Got back into the van, put it in reverse stopped put van in drive hit the gas, and boom. It stalled and now refuses to restart. You can smell gas when I try to crank. Already changed the crankshaft position sensor. There is fuel in the rail. Starter does what it is supposed to do, but my father in law says there is no spark, exchanged ignition coil. Still nothing, no cel on, but obd pulled a code P0750, but apparently the vehicle could still start with that code? Battery drained, so I charged it. There is still rapid battery drainage when I go to try and start it up so I just disconnected the battery to prevent further drainage. I am at a total loss here.