DHD 700-12639000 LML LGH Duramax Fuel Return Line Assembly 2011-2016

It always best practice to replace rubber return lines during any major system disassembly. These hoses often get brittle and have a tendency to crack on high mileage vehicles. Although the exterior of the hose may look fine its not uncommon to see degradation on the interior of the hose. We see lots of the plastic quick connects on these return hoses get damaged during service or during performance upgrades.

If your truck has experience a CP4 failure its imperative you replace this return line. The regulated portion of this assembly is notorious for trapping metal debris.

This direct replacement injector return line assembly from DHD services both banks and includes regulated return valve located near the thermostat housing.

Fitment:

• 2011, 2012, 2013, 2014, 2015, 2016 Chevrolet Silverado 2500HD 3500HD Duramax 6.6L LML LGH 
• 2011, 2012, 2013, 2014, 2015, 2016 GMC Sierra 2500HD 3500HD Duramax 6.6L LML LGH 

Compare to:

• GM 12639000
• Exergy E05 10510
• Bosch 0445130020