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2018 GMC Sierra 2500 HD
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60-Day Returns
Lifetime Replacement
2018 GMC Sierra 2500 HD

2018 GMC Sierra 2500 HD Fuel Return Lines

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Fuel Return Line
AC Delco®
Fuel Return Line
Part Number: AC12673878
Guaranteed to Fit
$37.99
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.6L
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.6L
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.6L
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.6L
Product Details
Warranty : 24-months or unlimited mile AC Delco limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Fuel Return Line
AC Delco®
Fuel Return Line
Part Number: AC84182159
Guaranteed to Fit
$51.49
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.6L Eng. Designation: L5P, Eng. VIN: Y, 4-Door, Extended Cab Pickup, 158.1 in. Wheelbase
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.6L Eng. Designation: L5P, Eng. VIN: Y, 4-Door, Crew Cab Pickup, 153.7 in. Wheelbase
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.6L Eng. Designation: L5P, Eng. VIN: Y, 4-Door, Crew Cab Pickup, 167.7 in. Wheelbase
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.6L Eng. Designation: L5P, Eng. VIN: Y, 4-Door, Crew Cab Pickup, 153.7 in. Wheelbase
Product Details
Warranty : 24-months or unlimited mile AC Delco limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : GM Original Equipment Series
Fuel Return Line
AC Delco®
Fuel Return Line
Part Number: AC84077202
Guaranteed to Fit
$79.99
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.6L L5P Engine, VIN Y, 4-Door, Crew Cab Pickup, 167.7 in. Wheelbase
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.6L L5P Engine, VIN Y, 4-Door, Crew Cab Pickup, 167.7 in. Wheelbase
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.6L L5P Engine, VIN Y, 4-Door, Crew Cab Pickup, 167.7 in. Wheelbase
Product Details
Warranty : 24-months or unlimited mile AC Delco limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Fuel Return Line
AC Delco®
Fuel Return Line
Part Number: AC84196797
Guaranteed to Fit
$136.99
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.6L 4-Door, Crew Cab Pickup, 153.7 in. Wheelbase
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.6L 4-Door, Crew Cab Pickup, 153.7 in. Wheelbase
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.6L 4-Door, Crew Cab Pickup, 153.7 in. Wheelbase
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.6L 4-Door, Crew Cab Pickup, 153.7 in. Wheelbase
Product Details
Warranty : 24-months or unlimited mile AC Delco limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : GM Original Equipment Series
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Helpful Automotive Resources

The Function and Common Symptoms of a Faulty Fuel Return Line
The Function and Common Symptoms of a Faulty Fuel Return LineModern gasoline powered vehicles are equipped with fuel injection, and fuel injection systems may or may not have a return line type fuel system.
How to Use a Fuel Pressure Tester the Right Way
How to Use a Fuel Pressure Tester the Right WaySearch for the specifications of your vehicle to learn what readings you should expect. This can be done by checking your vehicle owner’s manual.–Anthony Harlin, ASE Certified Master Automobile Technician Fuel Pressure Readings and What They Mean It pays to know what different fuel pressure readings mean for your ride.