Initial start procedure, Checking pump noise, Pureflow airdog airdog – PureFlow AirDog DF-165-4G - GM Duramax 2015+ User Manual

Page 17

PureFlow AirDog

AirDog

II-4G 2015 and UP DuraMax Diesel

Section 7 Initial Startup Procedures

INITIAL START PROCEDURE

The AirDog

II is a self priming system, however, to prevent potential damage and reduce the

life expectancy of the system, it is recommended to pre-fill only the water separator with diesel
fuel before initial startup.

7-1.

Fill the water separator with diesel fuel.

7-2.

Turn the starter key to the on/run position.

7-3.

While the AirDog

II is operating, bleed the air from the fuel line to the engine by

loosening the air bleeder screw on the stock fuel filter housing. As soon as the line is
purged of air and pure fuel is observed, properly tighten the bleeder.

NOTE: put a rag or

shop towel over and around fitting to prevent splatter. Catch all spilled fuel and dispose
of properly.

7-4.

Start the engine!

RECHECK ALL FUEL FITTINGS FOR LEAKAGE AND PROPERLY TORQUE. BE
SURE ALL FUEL LINES ARE PROPERLY ROUTED TO PROTECT FROM
EXCESSIVE HEAT AND SECURED TO PROTECT FROM CHAFFING AND
ABRASION. RECHECK ALL ELECTRICAL LINES, SECURE AS NECESSARY.

Checking Pump Noise!

NOTE: Each AirDog

II has been manufactured in a Quality Controlled process and fully tested

for operation and performance before shipment. This is a very quiet and smooth running system.
With fuel or air alone, the AirDog®II fuel pump will run very quietly. However, if any fuel
fitting on the vacuum side, between the fuel tank and the AirDog

II or the water separator, has

been left loose during the installation process, the system may suck air at an excessive rate and
will be very noisy. To check for this problem, unscrew the water separator 3 or 4 full turns and
activate the AirDog

II by turning the ignition switch to on. If the AirDog

II runs quietly, then

excessive air from a loose fitting or leaking pre-filter seal is most likely the reason for the
excessive noise. Correct as necessary.

The seal groove in the 3” filter is a snug fit and on occasion the seal has been found to not
be fully seated. Remove the water separator; remove the seal from the top of the nut
plate. Clean and lubricate the seal grove. Carefully replace the seal in the groove. Be
sure to fully seat the seal.

Check the fittings, especially the quick connect at the tank.