FASS Titanium Install Class 8 Part 4

The FASS Titanium series designed for Class 8/Semis 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 4 of a model-specific five-part series about how to install a FASS Platinum fuel system.

Please find the links to Part 1, Part 2, and Part 3, and Part 5 here.

The double-draw/double return and the single-draw/single return fuel line systems share instructions. The steps pertaining to the the single-draw/single return system are indicated in green. Please follow all instructions in descending order.

Do not use sealant on AN fittings. Only use sealant on threads installed into pump assembly or joining fittings.

The single-draw/single return system resembles the following picture:

The double-draw/double return system resembles the following three pictures:

Return line from FASS with straight ends to cross member where the line will "T" off.

Assembled "T"

From "T" to each fuel tank with 1-straight fitting & 1-90° fitting on each line. These lines must be the exact length on both sides.

Locate a fuel return port into the fuel tank. Most KWs have a 1/4”. Peterbilts have 3/8" or 1/2" extra pipe plug located by the fuel lines at the top of the fuel tank. Other models may have an extra port somewhere at the top of the fuel tank. Remove the plugs and install the –8 ANx5/16 NPT into each tank. It may be necessary to use a brass bushing.

Install –8 AN hydraulic fitting into fuel line.

Assemble fuel line into female hose fitting (reverse threads). Apply a modest amount of oil to the interior lining.

Secure female end in vise.

Oil male end of 90° JIC swivel fitting and assemble into female end.

Completely tighten the male portion.

Assemble the "T" using (1) 3/8 NPT "T", (2) -8 ANx3/8 MPT & (1) -8 ANx3/8 MPT 90°.

Attach the line to the return port of the FASS labeled "R." Route to the center of the nearest cross member aligned with the ports in the fuel tank being used for return fuel. Measure & mark this line as it will connect to the 90° fitting of the "T" in this location.

Cut the fuel line and assemble a –8 AN hydraulic fitting in the opposite end of the line connecting to the "R" port of the FASS.

Assemble a –8 AN hydraulic fitting into one end of the remaining fuel line. Route this fuel line from straight fitting of the "T" to the return port in the fuel tank, mark & cut.

Route the side with the exhaust first. It will be necessary to travel below the frame to avoid the exhaust.

Each side must be exactly the same length. Assemble (1) of each –8 AN 90° & -8 AN Straight into each line.

Route and loosely connect the assembled fuel lines to the appropriate points of connection, including the "T."

Torque all connections to 18 ft./lbs. Secure the fuel line and all fittings.