FASS Duramax Flow Enhancer Install 01-12 Duramax Part 3

The FASS Duramax Flow Enhancer series designed for the 2001-2012 Chevrolet Duramax 2500 and 3500 is available at Orange County Diesel in Huntington Beach, California. If you have any questions about any other FASS product, or if you need expert assistance installing your FASS Platinum, feel free to call and speak to a FASS service professional at 714-848-2170.

This is Part 3 of a model-specific four-part series about how to install a FASS Duramax Flow Enhancer.

The 2001-2010 installation steps are very similar to the 2011-2012 Duramax. The steps specific for the 11-12 installation are in green, and the steps unique to the 01-10 installation are in blue.

Please find the links to Part 1, Part 2, and Part 4 here.


Step 3: Mount FASS Fuel Pump

Position FB-4002 bracket to mounting location on the cross member directly in front of the fuel tank making sure there are no obstructions.

Position system to mounting location on the cross member directly in front of the fuel tank making sure there are no obstructions. The pump should be mounted parallel to the frame.

Make sure the mounting holes are not located on the radium bend of the cross member. Using template, mark holes. Pre-drill with 1/8" bit and final drill with 5/16" bit.

The weep hole must face down for proper pump operation. Any other direction will void your warranty.

Mount pump to the cross member using 5/16" bolts.

Reach between the cross member and the bed to install the 3 bolts and tighten with a 1/2" socket.

The DIPF fitting does not require sealant on it’s threads. It is an O-ring sealed fitting. Install two DIPF-1003 fittings into the Inlet/Outlet ports on the DMAX. Torque to 18 ft./lbs.

Connect the male end of the wire harness to the female electrical connector on the FASS pump. Turn key to the “On” position. With the FASS pump on, squirt a liberal amount of WD-40 or other lubricant into the Inlet port. This procedure will “wet” the Gerotor and allow for better suction during initial priming.