| Description and Operation The fuel charging system consists of a fuel rail, a fuel pressure regulator and four fuel injectors. The fuel rail is a one-piece aluminium alloy die casting with machined holes for the fuel pressure regulator and fuel injectors. The fuel rail is retained by two bolts and sealed by means of tapered rubber seals. The fuel pressure regulator is fitted directly onto the fuel rail and is retained by two bolts. Sealing is achieved with two O-ring seals. The fuel pressure regulator is designed to maintain the fuel pressure at 2.7 bar with any excess fuel being returned to the fuel tank. The fuel injectors are of the side-feed type. They are surrounded by fuel when mounted in the fuel rail. This has an advantage over top-feed fuel injectors in that operating temperatures are reduced. Each fuel injector is retained by two bolts and sealed with two O-ring seals. The fuel injectors are activated sequentially by the powertrain control module which modifies fuelling by adjusting fuel injector opening times according to engine operating conditions. | 
