I have a 1995 C280 Mercedes

Replaced the Power Vacuum Locking Mechanism located in the truck on the right hand side.Then we connected the battery.The car would not start.The only way the car stated was to jump it from the starter solenoid.So for the last month, I connected a push start button that is being jumped form the solenoid.(I think this is because of the anti-theft system) I also do not have a remote to the car, just the key.

Two weeks ago my car stopped working.The car would crank, but not start.So we replaced the fuel pump and still not working, then the fuel filter, still not working. (both of these parts were pretty new and did not need to be replaced)

I don’t know what to do know.Also the battery is losing power, and I am going to have to replace this all of a sudden.

HELP