When I push start button it takes many many cranks to start of cars been sitting for a while. Starts right up if shut off and start with in few minutes. Took it to BP they put on computer and said everything working correctly but fuel rail pressure drops to 0 after shut off. I’ve replaced all plugs, all coil over plugs, the MAS sensor, the fuel rail pressure sensor and it sill happens and pressure drops to 0 after shut off. Any ideas off LR2 fuel pressure suppose to drop to 0 after shut off PSInis normal while running and car has tons of power and runs great once started. BP said fuel draining back into fuel tank and reason takes multiple cranks on cold start is fuel pressure has to build from nothing. But is runs like a dragster once she fires up? At a loss as to whether the fuel pressure should be going to 0 once shut off. Help!