PureFlow AirDog FP-150 - Dodge Cummins 1989-1993 - Manual (Page 24)

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PureFlow AirDog
AirDog® 100 & 150 Dodge Cummins 1989 - 1993
Section 10 Pressure Regulator Upgrade
Changing the Regulator Spring
The AirDog® is shipped from the factory with the fuel pressure preset.
However, for some applications, you may desire to increase or decrease the pressure output
from your AirDog®. To do this, you will need to purchase and install a different 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 10-1 Figure 10-2 Figure 10-3
Step-2. Remove the ‘Return to Tank’ fuel line fitting exposing the regulator spring.
Step-3. Remove the ball and spring.
Figure 10-4 Figure 10-5 Figure 10-6
Step-4. Install the new regulator spring by reversing the steps shown in Figures 10-1 through
10-6. 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.