Shop LinesToGo for your 1999 GMC Sierra truck. Our FL488-L4 set of GMC Sierra fuel lines are ideal for a 2500 trucks w/Ext Cab for 5.3L engines.

Fuel Line Set 1999 GMC Sierra 2500 Ext Cab 6.5ft/8ft Bed 2WD & 4WD 5.3L engines

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.