L5P High Pressure Injector Line Kit, 8 Lines | 2017-2026

The Merchant Automotive High Pressure Fuel Injector Line Kit is a complete set of 8 rail to injector lines for 2017-2026 Chevy Silverado and GMC Sierra 2500HD and 3500HD trucks with the L5P 6.6L Duramax diesel. These lines carry high pressure fuel from the fuel rails to each injector. On the L5P, the high pressure injector lines are one time use and must be replaced any time they are removed, so this kit gives you a full new set for injector service or any job that requires pulling the lines.

Note: L5P high pressure injector lines are one time use. Replace every line that is removed.

Features

• Complete set of 8 high pressure injector lines
• Replaces GM 12685924 (cylinders 1-3-6-8) and 12685923 (cylinders 2-4-5-7)
• Connects the fuel rails to the injectors
• One new line for every injector, as required after removal
• Fits 2017-2026 L5P 6.6L Duramax

What's Included

• (8) High pressure fuel injector lines, 2017-2026 L5P

Why Replace Them

• L5P injector lines are one time use and must be replaced after removal
• Stops high pressure fuel leaks at worn or damaged line ends
• One kit replaces every injector line, so there's no need to order cylinder by cylinder

Installation Tips

• Install new lines any time the old lines are removed. Do not reuse them.
• Keep the line ends clean and capped until installation so no debris enters the injectors.
• Prime the fuel system and check every line end for leaks before driving.

Related Parts

• L5P Fuel Injector O-Ring Set
• Fuel Injector Copper Seal, 8 Pack
• Fuel Injector Bracket Bolts, 8 Pack
• Fuel Injector, L5P Duramax
• S&S Diesel Motorsports Fuel Injector, L5P
• Exergy Stock Replacement Fuel Injectors, Set of 8, L5P

Frequently Asked Questions

Can I reuse my old injector lines?
No. L5P high pressure injector lines are one time use and must be replaced any time they are removed.

Can I buy just one line?
Yes. See the Cylinders 1-3-6-8 and Cylinders 2-4-5-7 injector lines.

What else should I replace when doing injectors?
Add the L5P Fuel Injector O-Ring Set, Fuel Injector Copper Seal 8 Pack and Fuel Injector Bracket Bolts 8 Pack.

Will this kit fit older Duramax trucks?
No. It fits the 2017-2026 L5P only. For 2011-2016 LML trucks, see the LML Fuel Injector Line Kit.

For warranty information or to submit a claim, see our Warranty Form.