Lb7 fuel injector lines

Lb7 fuel injector lines DEFAULT

LB7 High Pressure Injector Lines (Set Of 8)

Fits 2001-2004 Chevy/GMC 2500/3500 HD

Part# DMAX720123

Brand New High Quality Stainless Steel Injector Lines resist the corrosion that is prone to happening on the OE parts.It is always a good idea to replace the high pressure fuel lines when replacing your injectors. New lines will help protect your fuel injectors and help prevent future leaks or failures.  This set is a direct upgrade to the factory lines on your 2001-2004 6.6L Duramax LB7. Replacement injector line retainer clip and injector line retainer bolt available separately.

  • Complete Set
  • Stock Upgrade
  • Brand New, Not Remanufactured
  • High Quality Ferritic Stainless Steel Construction
    • ​Ferritic steels are high chromium, magnetic stainless steels that have a low carbon content. Known for their good ductility, resistance to corrosion and stress corrosion cracking


  • 2 x Line for Cylinders 1 or 8 (Part# DMAX720) Replaces GM Part# 97188720
  • 2 x Line for Cylinders 2 or 7 (Part# DMAX723) Replaces GM Part# 97188723
  • 2 x Line for Cylinders 3 or 6 (Part# DMAX721) Replaces GM Part# 97188721
  • 2 x Line for Cylinders 4 or 5 (Part# DMAX722) Replaces GM Part# 97188722


LB7 Duramax Injection Lines Complete Set (8)

Original LB7 Injection lines will corrode and break and are a leading cause of contamination when changing the injectors. If you are changing your injectors, have a line failure, or are looking to upgrade your stock lines, we’ve got you covered with our all new Fleece Performance LB7 Injection Lines! This set is a direct upgrade to the factory lines on your 2001-2004 Duramax LB7 and features machined 4140 injector swivel nuts, corrosion resistant lines and includes all 8 lines in one complete set.


  • Complete set of 8 new lines
  • Machined 4140 injector swivel nuts
  • Corrosion resistant lines



  • (Qty 2) Line for Cylinders 1 and 8 - Replaces GM Part# 97188720
  • (Qty 2) Line for Cylinders 2 and 7 - Replaces GM Part# 97188723
  • (Qty 2) Line for Cylinders 3 and 6 - Replaces GM Part# 97188721
  • (Qty 2) Line for Cylinders 4 and 5 - Replaces GM Part# 97188722




Prop 65 WARNING: Cancer & Reproductive Harm - 

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DHD 700-012AFT LB7 Duramax High Pressure Fuel Injector Line Set 2001-2004 6.6L

DHD 700-012 LB7 Duramax High Pressure Fuel Line Kit

Skip the dealer prices and replace your damaged, rusty high pressure injector lines with this OE supplier replacement from DHD.

Our industry resources provide us excellent opportunities to bring you high quality products at industry leading pricing. These lines will fit like OE, seal like OE and last like OE without the OE price tag.

Unlike the competition, our lines are tested to meet J1958 SAE standards. They must endure 30,000psi without breakage or leakage. The best part is we use the parts we sell! These lines are currently on multiple 1000HP trucks with rail pressures reaching near 30,000psi.


(2) 700-97188720 

(2) 700-97188723 

(2) 700-97188722 

(2) 700-97188721 


2001-2004 Duramax 6.6L LB7

DHD always recommends replacing rusty, missing or damaged fuel system hardware during service. Our 304SS LB7 Line Retainer Kit is an excellent addition to our high pressure fuel line set.


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Injector lb7 lines fuel

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LB7 Injector Replacement for 2001-04 Duramax

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