Late model cars that have fuel injection use in tank pressure pumps, which put out 100 to 120 PSI.  These pumps have 5/16" and 3/8" diameter metal tubes with a raised area about 3/4" from the end of the tube as seen in the picture, you can use our parts which we developed in 1999 for GM to help solve the connections to the fuel injection systems.

P/N     5805   Pressure/Return