DIESELSITE 7.3L High Volume Low Pressure Oil Pump

DIESELSITE has developed a custom-machined HIGH VOLUME Low Pressure Oil pump to fit the 1994-2003 Ford 7.3L PSD.  This high volume unit supplies more volume to handle the higher demands of larger high pressure oil pumps and also provides additional oil for twin turbo setups.  Most importantly, it will provide a better supply of lubricating oil to protect your engine with better lubrication and cooling to main bearings and piston oilers.

DieselSite set out to make not only a larger pump, but also a better-built pump.  Each set of gears is custom-cut and ground as a set, and then ground to the housing to achieve final clearance.  This ensures less wear and better efficiency, having seen other aftermarket replacement pumps be out of parallel from the back to the front surface of the pump, as well as the mounting surface machined so poorly that they wobbled on a flat surface.  They rely on the gasket to seal, but the aforementioned surface inconsistency allows the gears to move in an undesirable manner, possibly leading to low oil pressure or, in extreme cases, cause scoring or damage to the timing cover.

Includes the new pump cover with dual Viton seals, new pump cover to front engine cover gasket, and new oil pump gears designed to increase flow and pressure while reducing cavitation.

*NOTE: Do not attempt to use a different pump housing with these gears, they are not cross-compatible.

Installation is straightforward forward requiring only a few basic tool as well as a fan removal tool and harmonic balancer puller, which you can rent from local auto parts stores. This pump can be bolted onto any configuration from stock to highly modified engines.

Below is an example of a truck with normal miles for the year.  Exact numbers are NOT guaranteed, but a comparable result should be expected.

Startup (65°)

Idle (680 RPM): 40 PSI

High Idle (1100 RPM): 50 PSI

Warm (170°)

Idle (680 RPM): 20 PSI

Cruising (2200 RPM): 40 PSI

Free Rev (3500 RPM): 52 PSI

HIGH VOLUME PUMP: Initial Install

Startup (65°)

Idle (680 RPM): 52 PSI

High Idle (1100 RPM): 65 PSI

Warm (170°)

Idle (680 RPM): 32 PSI

Cruising (2200 RPM): 55 PSI