Installation manual

PureFlow

Technologies, Inc

AirDog

FP-100 & FP-150 Dodge 2005 - 2009

Section 9 Pressure Regulator Upgrade

Changing the Regulator Spring

The AirDog® is shipped from the factory with the fuel pressure preset.

For the 2005-2009 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.

Figure 9-1 Figure 9-2 Figure 9-3

Step-2. Remove the ‘Return to Tank’ fuel line fitting exposing the regulator spring.

Step-3. Remove the ball and spring.

Figure 9-4 Figure 9-5 Figure 9-6

Step-4. Install the new regulator spring by reversing the steps shown in Figures 9-1 through

9-6. 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.

NOTE: Should any installation problems arise, please call, toll free 1-877-463-4373 or

573-635-0555, for assistance (Monday – Friday, 8:00 am – 5:00 pm CST).