My 1995 bmw wont start!

I don't think a 1995 3 series has a timing belt. 100% sure if its the inline 6 cylinder.bmw only used timing belts on two engines. (never replaced one) I would first start with a fuel pressure check to start your diagnosis. From there i'd check to see if you are getting spark and maybe even see if your plugs are fouled. If you have fuel pressure and spark, i'd suspect bad gas.(especially if the problem occured soon after filling up). It may be a good idea to do a compression check if you found no fault with the vehicle.