Fuel Injection: Description

A fuel pump draws fuel from tank through a strainer and forces it, under pressure, through a filter. Fuel is then forced through fuel inlet passage in cylinder head and through fuel lines to injectors. Fuel then passes through another filter element within injector to a chamber where it is metered, displaced and atomized through spray tip into combustion chamber. Excess fuel is circulated through injectors by pump and serves as a coolant. Circulation of excess fuel also eliminates air or vapor in lines by returning it to fuel tank where it is vented to the atmosphere. This excess fuel is returned to tank through restricted fitting in outlet fuel pipe.