nephron said:Whaaa? How would oil pressure correlate with an injection point? Since oil pressure is static, you couldn't possibly open and close an injector in that way, could you? Aren't most modern Diesels/any FI run by electrical solenoids operating under high fuel pressure conditions?
In a nut shell--
On the Ford diesel engines, there's a separate high pressure oil pump. Output ranges from 450-4000 psi.
The oil is delivered to the injector solenoids, which open and close to control oil pressure in the injector.
The oil pressure drives the Amplifier piston, that then acts on the fuel plunger which injects fuel into the combustion chamber at pressures of up to 28,500 psi through the nozzle assembly.
Fuel is supplied to the injector at approximately 50 psi through fuel rails in the cylinder heads.
The 6.0L (Siemens) injectors operate on 48V, while the 7.3L (Caterpiller) operate on 115V.