Hi Non start,so customer filled up with petrol and started ok,so suspect in tank fuel filter. Decided to check codes anyway and with snappy and have; P1471 VIS balance valve always open. P1472 VIS balance valve always closed. P0336 CPS. So could also be CPS problem. Cleared codes and P1471 returned,only this time saying balance valve CLOSED. Does anyone know what these two codes mean and why should P1471 change from open to closed? No info on A/d Regards Tony