Dieselsite High Volume LPOP - 1994-2003 Ford F-Series

Dieselsite High Volume LPOP – 7.3L Powerstroke (1994–2003)

The Dieselsite High Volume Low Pressure Oil Pump (LPOP) is a purpose-built upgrade designed to meet the increased oiling demands of modified and high-mileage 7.3L Powerstroke engines. This custom-machined pump delivers increased oil volume and improved pressure stability, providing better lubrication, cooling, and long-term engine protection.

This upgrade is especially beneficial for engines running larger HPOPs, performance tuning, or twin turbo setups, where oil demand exceeds the capability of a factory pump.

🔥 Why Upgrade Your LPOP:

• Supplies higher oil volume to support larger high-pressure oil pumps

• Improves lubrication to main bearings and piston oilers

• Enhances oil cooling and pressure stability

• Reduces cavitation compared to stock and poorly machined aftermarket pumps

• Ideal for stock to heavily modified 7.3L engines

⚙️ What Sets the Dieselsite Pump Apart:

Unlike many aftermarket pumps, Dieselsite focused on build quality and precision, not just size.

• Gears are custom cut and ground as matched sets

• Final gear-to-housing clearances are precision finished for efficiency

• Machined surfaces are flat and parallel to prevent wobble and gear movement

• Eliminates issues seen in other pumps that rely on gasket compression to compensate for poor machining

Poorly machined pumps can allow internal gear movement, leading to low oil pressure, scoring, or front cover damage — problems this pump is specifically designed to prevent.

📦 What’s Included:

• High volume LPOP housing

• New oil pump gears (matched set)

• New pump cover with dual Viton seals

• New pump cover-to-front cover gasket

⚠️ Important Installation Notes:

• Do NOT mix gears with another pump housing — components are not cross-compatible

• Inner gear marked “damper” or “out” must be installed with the deeper relief facing the harmonic balancer

• Incorrect gear installation will cause catastrophic front cover damage

🛠️ Installation Overview:

• Direct bolt-on for 1994–2003 7.3L Powerstroke

• Requires basic hand tools, fan removal tool, and harmonic balancer puller

• No tuning or engine modifications required

• Compatible with stock, performance, and twin-turbo configurations

📊 Real-World Oil Pressure Results
(Results vary by engine condition; values shown are representative)

Stock Pump (Warm 170°):

• Idle: ~20 PSI

• Cruise: ~40 PSI

• Free Rev: ~52 PSI

Dieselsite High Volume Pump (Warm 170°):

• Idle: ~32 PSI

• Cruise: ~55 PSI

• Free Rev: ~68–70 PSI

Improved pressure is maintained even after extended mileage, showing long-term stability and reliability.

🚗 Fitment:

• 1994–2003 Ford 7.3L Powerstroke Diesel

If you’re building for reliability, performance, or longevity, the Dieselsite High Volume LPOP is a critical upgrade that ensures your 7.3L gets the oil supply it needs — when it needs it.