Installation Manual

PureFlow AirDog®
AirDog® FP-100 & FP-150 1998.5-2004 Cummins Diesel
Section 10 Pressure Regulator Service
27
Changing the Regulator Spring
The AirDog® is shipped from the factory with the fuel pressure preset.
For the1998.5-2004 Dodge Cummins the AirDog® fuel outlet pressure is preset at 15 PSI
(±2). However, for some applications, you may desire to increase the pressure output from your
AirDog®. To do this, you will need to install a higher tension spring.
Regulator Spring Replacement Procedure
The regulator spring and ball assembly is located inside the Return to Tank fuel
port.
Step-1. Disconnect the ‘Return to Tank’ fuel line.
Step-2. Remove the ‘Return to Tank’ fuel line fitting exposing the regulator spring.
Step-3. Remove the ball and spring.
Step-4. Install the new regulator spring by reversing the steps 1 thru 4. Be sure to place the
regulator ball in the regulator seat before inserting the spring. Properly torque the
return line fitting and swivel connection when finishing.
Figure 59
Figure 62
Figure 61
Figure 60