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What is the High-Pressure Oil Pump??

HPOP- High Pressure Oil Pump: A gear-driven, hydraulic supply pump responsible for sending the required oil volume through the oil rails, and for the injectors to use.

What does it do??

Instead of a conventional injection pump, HEUI systems use a high-pressure oil pump.

The high-pressure oil pump in the Ford 7.3L Power Stroke is a seven-piston, swashplate pump, gear-driven and externally mounts to the front cover at the front of the lifter valley. The Ford 7.3L Power Stroke HPOP is gear driven but isn’t timed to the engine.

The high-pressure oil pump in the Ford 6.0L Power Stroke sits at the rear of the engine within the crankcase itself. The early model (2003) unit like the Ford 7.3L Power Stroke isn’t timed to the engine and is also a seven-piston, swashplate-style pump with an aluminum housing. The later model (2004-2010) unit has a cast iron housing and operates much like the crankshaft and pistons of an engine.

Unlike conventional injection pumps, the high-pressure oil pump does not create pressure. It creates a volume of oil for the injectors to use. The injection pressure regulator – IPR Valve, controlled by the PCM is responsible for creating injection pressures in a range of 450 to 3,000 psi on 7.3L engines, and 450 to 3,600 psi on 6.0L Power Strokes.

The most common problems with High Pressure Oil Pump:

  • ICP sensor leaking and reading inaccurately
  • IPR sticking, leaking
  • Leaking injector O-rings
  • Weak injectors
  • A leak on one of the HPOP line seals

Before jumping into the job of replacing your HPOP check your system for leaks, check for sufficient engine oil levels. Test and verify both the ICP sensor and IPR valve are in proper working order. Many high-pressure oil pumps are replaced only to find the IPR valve was the actual fault of the system failure. And above all else, change your oil and filter!!!!! A CLEAN oil system is vital in the proper function of your high-pressure oil system.

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