I cant get the gas tank on my bmw 528i to open

you should be able to tip the rear seat you should be able to trip the lock but check for a release cable around the rear deck, much easier

This is normal in this year, the tank is pressurized to about 5 PSI to control fuel vapor emissions

The two rear doors seems to be a child safety lock issue. Check on the door jams and see if there is a switch, or check your manual if you have one. The gas tank door should also have a switch in the car, or a cable beside the seat or somewhere. I'm not that familiar with BMW, so i am just trying to do some helpful guessing.

an air lock in the system.that is what the bleeders for...

I am not familiar with this car, but most with electric locks can be unlocked the old fashioned way by placing the key in the lock and turning. Barring that, call for a wrecker or locksmith to open the car, or somehow get power to the electrical system to power the locks. If the hood is open, or openable from the outside, just use jumper cables to apply power. Perhaps you could get to the starter feed cable (or even the batter feed) from underneath the car. I hope this gives you some idea that is helpful in resolving your problem.

Remove arm(s), put wiper motor in park,(shut off) then re-install arm at base of windshield where they were before,when shut off.(in park position.)

You can jump your 98 528i from under your hood. On top of the center of your engine there is a positive (+) sign. You have to pry the cover open and there is also a negative ground spot to the left of that. Bmw is pretty smart!

it sounds like the lock actuator inside the door has frozen. if that is the case, you will have to remove the inner door panel partially or fully to gain access to the actuator.if you press down on the door lock knob, does it move down.if not I would definitely suspect a failed actuator.

my 96 328i sedan seems like its on lock down. it was driving wonderful then i notice that my gas gauge showed i was below empty which i wasnt. so i turned off my car & when i turned it back on it didnt start, it didnt even make that noise that it was rolling over. some body shops have been telling me its my fuse that went out & it locked down my car. is it my ignition fuse?? cause i thought it was the starter. if it is the fuse please some one tell me which one & what fuse it is.

The sending unit is most likley bad.Its located in the gas tank with the fuel pump assembely.The assembely needs to be replaced.