The first items tested were single Raptor injector elements, various designs of high-volume gas injectors. Fuel injectors are located under the intake manifold. The fuel injectors are typically ECU-controlled. The engines utilize variable geometry turbochargers and Bosch piezo-electric injectors. A jet engine afterburner is an extended exhaust section containing extra fuel injectors. Other components like the fuel injectors, intake valves, and fuel pump have also been updated. This accumulator supplies multiple fuel injectors with high-pressure fuel. Fuel injection need electrical power to open and close the fuel injectors. Some direct-injection systems incorporate piezoelectronic fuel injectors. Low voltage can eventually cause damage to the fuel injectors. It can be used in existing engines with only minor modifications to carburettors/injectors. V7 are single scroll, AVCS, throttle by cable, top-feed injectors, engines. The engine received larger fuel injectors and an increase in compression to 8.6&colon;1. During the 1930s the factory developed a range of Diesel fuel injectors. Differences include longer of the injectors to be closer to the intake ports.