![]() This forces the intensifier piston down, which pressurizes the diesel fuel found inside the injector. When the solenoid is actuated, a poppet valve inside the injector opens, allowing the high pressure oil to flow inside the injector where it presses against an intensifier piston. The IDM will send a pulse-width signal to the solenoid on the injector. When the computer sees that a cylinder needs to fire, a signal is sent to the Injector Driver Module (IDM). ![]() A high-pressure oil pump, which is gear driven by the engine, is also used to supply high pressure oil through the heads to the injectors. Diesel fuel is supplied to the injectors through fuel rails inside the cylinder heads. The 7.3L Power Stroke uses a HEUI-style injector, which stands for Hydraulically Actuated Electronic Controlled Unit Injection. You may be spending $3,000 on high performance injectors, but you won't be spending $4,000 on dual Cp3s like the Duramax guys have to or dumping money into modding an injection pump like the 12V Cummins guys do. It's no question that aftermarket 7.3L injectors can be down right expensive, but when you take into consideration that the injector is the workhorse in this system, you'll soon understand why. How about a little Injector 101-a look at how a 7.3L Power Stroke injection system actually works.
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