DURAMAX

LB7 LLY LBZ LMM

MPROP / FCA Seal Kit

Fits 2001 - 2010

This o-ring kit consists of the (2) o-rings that fit the Fuel Injection Pressure regulator attached to the rear of the CP3 Pump by (3) T-25 Torx head screws. This part is called by many names including:

MPROP
FCA
Injection Pressure Regulator
Fuel Pressure Regulator
Fuel Control Actuator
Measuring Unit

The function of the injector pressure regulator is to control the output pressure of the high pressure CP3 fuel pump.

Anytime the MPROP is removed and replaced these fuel pressure regulator o-rings should ideally be replaced. Failure of the larger O-ring will cause external leakage, while failure of the smaller oring will allow fuel to bypass the MPROP resulting in loss of proper rail pressure control.

This offering is for (2) O-rings ONLY - an injection pressure regulator is NOT included. The regulator is shown to illustrate where the two orings fit.

Fits the following FCA Part Numbers (and others):
97369850, 0928400653 97384667 0928400673 0 928 400 535 97728979