Shop LinesToGo for your 1999 GMC truck fuel lines. Our FL488-F2 set of Sierra fuel lines are designed specifically for C/K 1500 trucks with extended cabs and a 4.3L engine.

Fuel Line Set 99 Sierra 1500 Ext Cab 6.5 ft & 8 ft box 2WD & 4WD 4.3L

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.