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Fuel injected engines use either electric fuel pumps mounted inside the fuel tank (for lower pressure manifold injection systems) [1] or high-pressure mechanical pumps mounted on the engine (for high-pressure direct injection systems). Some engines do not use any fuel pump at all. A low-pressure fuel supply used by a carbureted engine can be ...
The pump plunger begins descending, but the spill valve is open, and fuel recirculates back to the return line. Injection phase Partway through the pump stroke, the solenoid is energized, which closes the spill valve. The fuel is forced into the cylinder through the spray tip. Pressure reduction phase Toward the end of the pump stroke, the ...
fully demand-controlled and returnless; fuel tank–mounted low-pressure fuel pump; Fuel Stratified Injection (FSI): two-inlet double-cam–driven single-piston high-pressure injection pumps maintaining a pressure of 30 to 100 bar (435 to 1,450 psi) in the two stainless steel common fuel distribution rails (one rail per cylinder bank), six ...
fully demand-controlled and returnless; – fuel tank–mounted low-pressure fuel pump; Fuel Stratified Injection (FSI): camshaft-driven single-piston high-pressure injection pump supplying up to 150 bar (2,180 psi) fuel pressure in common rail fuel rail integrated into the inlet manifold, four combustion chamber sited direct injection ...
The basic operation can be described as a sequence of four separate phases: the filling phase, the spill phase, the injection phase, and the pressure reduction phase. A low-pressure fuel delivery pump supplies filtered diesel fuel into the cylinder head fuel ducts, and into each injector fuel port of constant stroke pump plunger injector, which ...
Injection pump for a 12-cylinder diesel engine An injection pump is the device that pumps fuel into the cylinders of a diesel engine . Traditionally, the injection pump was driven indirectly from the crankshaft by gears, chains or a toothed belt (often the timing belt ) that also drives the camshaft .
The Unit Pump system [1] is a modular high-pressure diesel injection system, which is closely related to the unit Injector system, and is designed for use in commercial vehicle diesel engines. [ 2 ] The systems use an individual injection pump mounted on the engine block for each cylinder so it is primarily designed for OHV or "cam in the block ...
electric low-pressure fuel lift pump, one toothed belt driven 1,600 bar (23,210 psi) injection pump, one central fuel distributor supplying two common rail (CR) fuel rails (one per cylinder bank), Bosch solenoid-valve injectors with seven-hole nozzles for homogenous fuel delivery, single and double pilot injection; Bosch EDC16 electronic engine ...