Diesel Performance Products, Inc. FASS FF-1001, Installation Manual

Page: 12 / 25

Step 3:
Identify Fuel Line Configuration
A. Fuel lines, excluding nylon type fuel lines, in excess of 6 years old should be replaced due to interior
lining deterioration.
This condition can cause many problems including but not limited to: fuel starva-
tion, uneven fuel tank levels and etc.
B.
When routing the return line from the FASS Fuel System, you will need to first identify your current
fuel system. Now match with the correct fuel line section below and follow the corresponding proce-
dures.
Uneven fuel level conditions can occur between the tanks if the pickup/return lines are improp-
erly installed.
B1. Most Popular - Usually on 1994 Trucks & Newer including Volvo and Mercedes Engines:
Double Draw/Double Return Line System. FASS fuel line kit ( FLK-S03) or Double Vent Return
Line Kit for trucks without the extra port of the fuel tanks( FLK-SO6 )should have all of the product to
complete this process
B2. 2nd Most Popular - Usually on 1993 Trucks & Older (except 359 Peterbilt - next selection):
Single Draw/Single Return Line System. FASS fuel line kit (FLK-S02) should have all of the product
to complete this process
B3. 359 Peterbilt : Single Draw Out of Cross Over Fuel Line/Single Return Line System
Dual Tank Recommendation:
1st Choice - Convert to a complete Double Draw/Double Return Line System(FLK-S03) or Dou-
ble Vent Return Line Kit (FLK-S06).
2nd Choice - Convert to a true Single Draw/Single Return Line System FLK-S02).
For optimal engine performance gains, the return line should return to its own port.
Application Accessory
#10 Feed Line Kit
FLK-S01
Single pick up/ Single Return FLK-S02
Double pick up/Double Return
FLK-S03
Mercedes 4000 Series
FLK-S03, FLK-S06, FLK-S04
Volvo D12-D15 FLK-S03, FLK-S06, FLK-S05

Below is a chart of available fuel line kits FASS has to offer. Using one of these kits will make
the installation cost effective and easier. This manual will refer to these FLK #’s

Take caution when producing extra ports. Do only as directed as to be careful not to cause
back pressure to engine return or severe engine damage.