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2021 GMC Sierra 3500 HD

2021 GMC Sierra 3500 HD Fuel Return Lines

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Fuel Return Line
Part Number: AC12673878
Guaranteed to Fit
$37.99
Vehicle Fitment
  • 2021 GMC Sierra 3500 HD SLT 8 Cyl 6.6L Engine Des: L5P, Engine Vin: Y
  • 2021 GMC Sierra 3500 HD Denali 8 Cyl 6.6L Engine Des: L5P, Engine Vin: Y
  • 2021 GMC Sierra 3500 HD AT4 8 Cyl 6.6L Engine Des: L5P, Engine Vin: Y
  • 2021 GMC Sierra 3500 HD SLE 8 Cyl 6.6L Engine Des: L5P, Engine Vin: Y
  • 2021 GMC Sierra 3500 HD Base 8 Cyl 6.6L Engine Des: L5P, Engine Vin: Y
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.

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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.