Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Hi my name is ***** ***** would like to offer my advise. If the fuel pressure is indeed dropping with the key off, then I would suspect the fuel pump as well. These cars have a returnless fuel system which means the fuel leaves the tank and goes to the fuel rail and does not have a return line to bring unused fuel back to the tank. Since it has this setup the fuel pressure regulator is on top of the fuel pump assembly. If I saw the car losing pressure like you are describing I would recommend the fuel pump assembly as well. If your mechanic suspect the purge solenoid have him take it off and use jumper wires to test becnh test it on a battery to make sure it is opening and closing fully. The evap lines can easily be tested with a smoke machine for leaks.
it could be if they only replaced the pump and not the entire module