Too much fuel system pressure? 1985 Mercedes 380sl It takes both hands to get gas cap off.

There is so much pressure in the fuel tank that it takes both hands to remove the gas cap. The amount of pressure that is released will blow your hat off. My 1982 380sl doesn't have that kind of pressure and it run better. What do you think? Could this cause the injectors to leak when the engine is off? Could the leaking injectors cause the smoke on start up? Could the high pressure cause any problems?

Thanks.