Hello

I have mercedes C230,1998 in very good condition,but one thing is problematic.
One day check engine light turned ON.
I connect my OBDII reader and I found code 0455.
I check everything and I did not found fuel leakage.I decide to buy new gas cap,but nothing.
After all I found one thing:
when my tank is full or 3/4 I have no problem and if I keep tank full I can drive car forever without of 0455 code problem.Under 3/4 level of fuel in tank cod 0455 come again very fast.
I found one connection more to this problem.First I have blinking light for gas reserve(low gas level)-.After I turn OFF and turn ON my car everything is OK,but after 20-30 miles I have again low level gas light but now followed with Chek engine light.
I checkfew times every part of fuel installation and I did not found anything wrong.
I hope that somebody can help me about this problem.

Best Regards