Alliant Power DT660020 is a new DTech fuel return line kit for the GM Duramax 6.6L LB7. DTech lists its contents as four banjo washers and one return line connection banjo washer, and Alliant names it a fuel injection return line gasket kit. DTech lists two kits per engine, for 2001 to 2004.5 LB7 pickups and 2003 to 2004.5 C4500 and C5500 medium duty trucks with the LB7.

Alliant’s application list includes the Chevrolet Silverado 2500 HD and 3500 and GMC Sierra 2500 HD and 3500 (2001 to 2004) and the GMC C4500 and C5500 Topkick (2003 to 2004). DTech also packs one DT660020 with four DT660019 injector install kits as DT660021. For 2004.5 to 2010 LLY, LBZ and LMM pickups, DTech lists a different return line kit, DT660023.

Specifications

Fits / Applications

• GM Duramax 6.6L LB7 pickups, 2001 to 2004.5
• C4500 and C5500 medium duty trucks with the LB7, 2003 to 2004.5
• Chevrolet Silverado 2500 HD (2001-2004)
• Chevrolet Silverado 3500 (2001-2004)
• GMC Sierra 2500 HD (2001-2004)
• GMC Sierra 3500 (2001-2004)
• GMC C4500 Topkick (2003-2004)
• GMC C5500 Topkick (2003-2004)

Part Numbers & Cross Reference

Reference number listed by DTech RTF26401

In the Box

• 4 banjo washers
• 1 return line connection banjo washer

Frequently Asked Questions

What is in the DT660020 kit?

Four banjo washers and one return line connection banjo washer, per DTech’s catalog.

How many DT660020 kits does an LB7 need?

Two per engine, per DTech. DTech’s DT660021 kit holds one DT660020 with four DT660019 injector install kits.

Does DT660020 fit the 2004.5 and later LLY?

DTech lists DT660020 for the LB7 only and lists return line kit DT660023 for 2004.5 to 2010 LLY, LBZ and LMM pickups. DTech’s catalog notes that LB7 trucks have a 1 as the eighth VIN character and LLY trucks a 2.

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