Shop LinesToGo for your 2004 GMC Sierra fuel lines. The FL590-A2D set of fuel cooler lines are ideal for all C/K 2500/2500HD/3500/3500HD models with a 6.6L engine.

Fuel Cooler Connector Lines for 01 GMC Sierra 6.6L Duramax Diesel

Connects the fuel line to the fuel cooler for FL588-A, B, C, D, E, F

Please Note: If you have purchased an aftermarket replacement fuel cooler, the fuel cooler connector lines attached to the fuel cooler may be different than the OEM fuel cooler connector lines. As shown under images - in Illustration A, the aftermarket fuel cooler connector lines are made with a straight sharp edge. When these are plugged into the fuel cooler line, they will cut the o-ring inside the connector causing a leak. If you wish to replace the fuel cooler connector lines before installation of the fuel cooler line, they are available to purchase under part number FL591-A as shown in Illustration B.

We are unable to warranty any of our products that are damaged by aftermarket fuel cooler connector lines.