Shop LinesToGo for your 2003 GMC truck. Our FL488-M2C set of Sierra fuel lines are designed for 1500HD trucks with Crew Cabs

Fuel Line Set 03 Sierra 1500HD Crew Cab w/GVW 8600 lbs (RPO Code C6P) for 6.0L engines.

Please Note: Before installing your fuel line, a shipping bend will need to be removed from the lines labeled SA488K313B and SA488K313C. See the video below on how to remove the shipping bend

Nylon Lines Between Fuel Lines and Fuel Tank:

Nylon lines between the fuel line and the fuel tank are not included. We do not make the nylon lines for this vehicle. However, you can purchase a nylon repair kit, 3069-01, which will attach to your existing nylon line providing a new connector for the supply and return lines to connect to.

Nylon Installation Instructions:

Step 1

Cut the new nylon hose in the same position as the original nylon hose.

Step 2

Cut the original nylon hose in the same position as the new nylon hose.

Step 3

Use the original nylon hose with connector and attach it with supplied union to the new nylon hose.