2011–2016 Duramax LML Low Pressure Supply Line Replacement Kit
Replace the commonly leaking low-pressure fuel feed line in the engine valley with a simple, reliable solution that eliminates the need to access the factory hard line.
This kit reroutes the low-pressure supply line entirely, connecting directly to the quick-disconnect fuel line coming from the tank and routing it to the driver-side connection at the top of the valve cover near the injection pump. By bypassing the factory hard line — which is extremely labor-intensive to access or replace — installation becomes significantly easier while improving reliability.
The kit is designed to work with both factory fuel systems and aftermarket FASS fuel systems, making it an excellent upgrade whether you're maintaining a stock setup or performing a CP3 conversion.
Vehicle Fitment
2011–2016 GMC Sierra 2500HD / 3500HD (6.6L Duramax LML)
2011–2016 Chevrolet Silverado 2500HD / 3500HD (6.6L Duramax LML)
Why You Need It
Duramax fuel lines located in the valley are exposed to extreme under-hood temperatures and vibration, which can lead to deterioration and fuel leaks over time. The factory hard line is buried beneath components and requires extensive labor to replace.
This kit eliminates that problem by rerouting the supply line externally, while also providing thermal protection to help reduce fuel heat soak and maintain optimal fuel system performance.
Key Features & Benefits
Precision Machined T-Fitting
Features secure quick-connect ends with a durable barbed outlet for reliable, leak-free fuel routing.
Heavy-Duty Fuel Hose
Designed to withstand harsh diesel environments without collapsing, cracking, or degrading.
Solid Brass Adapters
Includes two corrosion-resistant brass barbed fittings for secure and long-lasting hose connections.
Advanced Thermal Protection
Includes a premium adhesive heat shield sheet and reflective thermal tape to protect the fuel line from engine heat.
Direct Fit for LML Duramax
Engineered specifically for 2011–2016 LML Duramax engines, compatible with both factory CP4 systems and CP3 conversions.
What’s Included in the Kit
-
1× Machined High-Flow T-Fitting
-
1× Heavy-Duty Black Fuel Hose
-
2× Brass Barbed Fittings
-
1× Adhesive Heat Shield Sheet
-
1× Roll of Heat-Reflective Thermal Tape
Original: $95.50
-65%$95.50
$33.42
Description
Replace the commonly leaking low-pressure fuel feed line in the engine valley with a simple, reliable solution that eliminates the need to access the factory hard line.
This kit reroutes the low-pressure supply line entirely, connecting directly to the quick-disconnect fuel line coming from the tank and routing it to the driver-side connection at the top of the valve cover near the injection pump. By bypassing the factory hard line — which is extremely labor-intensive to access or replace — installation becomes significantly easier while improving reliability.
The kit is designed to work with both factory fuel systems and aftermarket FASS fuel systems, making it an excellent upgrade whether you're maintaining a stock setup or performing a CP3 conversion.
Vehicle Fitment
2011–2016 GMC Sierra 2500HD / 3500HD (6.6L Duramax LML)
2011–2016 Chevrolet Silverado 2500HD / 3500HD (6.6L Duramax LML)
Why You Need It
Duramax fuel lines located in the valley are exposed to extreme under-hood temperatures and vibration, which can lead to deterioration and fuel leaks over time. The factory hard line is buried beneath components and requires extensive labor to replace.
This kit eliminates that problem by rerouting the supply line externally, while also providing thermal protection to help reduce fuel heat soak and maintain optimal fuel system performance.
Key Features & Benefits
Precision Machined T-Fitting
Features secure quick-connect ends with a durable barbed outlet for reliable, leak-free fuel routing.
Heavy-Duty Fuel Hose
Designed to withstand harsh diesel environments without collapsing, cracking, or degrading.
Solid Brass Adapters
Includes two corrosion-resistant brass barbed fittings for secure and long-lasting hose connections.
Advanced Thermal Protection
Includes a premium adhesive heat shield sheet and reflective thermal tape to protect the fuel line from engine heat.
Direct Fit for LML Duramax
Engineered specifically for 2011–2016 LML Duramax engines, compatible with both factory CP4 systems and CP3 conversions.
What’s Included in the Kit
-
1× Machined High-Flow T-Fitting
-
1× Heavy-Duty Black Fuel Hose
-
2× Brass Barbed Fittings
-
1× Adhesive Heat Shield Sheet
-
1× Roll of Heat-Reflective Thermal Tape
