Skip to product information


SKU: 1913-BLK

Fittings sold separately.

Purchase fittings HERE

Whether upgrading for additional fuel delivery needs, to run upgraded fuel lines, or to simply clean up your engine bay, ACUiTY's K-Series High-Flow Fuel Rail is the most versatile and refined solution available. With it's 1/8 NPT port on top, -8 o-ring boss (ORB) ports on both ends and another -8 ORB port located at the middle of the rail, there are a variety of ways you can set the rail up for your car (see "Fitment Info" for application-specific fitting requirements). Each rail is constructed from 6061-T6 aluminum and has a satin-texture, anodized finish with laser-etched technical info and logos. 

Among the rails' other features are countersunk mounting screw holes and supplied class 10.9+ hardware to replace the OEM studs. Each rail is also supplied with a stainless steel 1/8 NPT plug in case a top-mounted fuel pressure gauge is used. The end locations for the -8 ORB ports have been specifically machined to help reduce the likelihood of wrench damage to the rail's cosmetic finish during installation. As an added bonus rarely found on aftermarket rails, the rail allows the end-user to retain the OEM injector clips if you wish, just for some added peace of mind.

Tons of possible configurations (using optional fittings, sold separately). See the "Fitment Info" tab for a list of fittings by vehicle and configuration.

Side-feed for OEM fuel lines on many vehicles:

Center-feed using a -6AN line:

Return setup with -6AN line for k-swaps and high horsepower applications: 

Return setup with -8AN line for k-swaps and very high horsepower applications:

Multiple fuel pressure gauge mounting options:

Mount a gauge on top using the 1/8 NPT Port, or plug the port if you prefer:


Or mount a gauge on the side of the rail using the 1913-F05 adapter fitting (sold separately):

Design retains OEM injector mounting clips for extra peace of mind:


ACUiTY has made 6 unique fittings (sold separately) available for the rail to help you customize it exactly to your needs. The fittings are as follows:

  • 1913-F02: -8 ORB Plug
  • 1913-F03: -6AN adapter
  • 1913-F04: -8AN adapter
  • 1913-F05: 1/8 NPT adapter
  • 1913-F06: 5/16" Quick-Disconnect adapter, short
  • 1913-F07: 5/16" Quick-Disconnect adapter, long


Each kit includes:

  • 1x fuel rail
  • 2x class 10.9 mounting screws
  • 1x stainless steel 1/8 NPT plug.
You will need PTFE thread sealant (do not use teflon tape on fuel systems as it can foul injectors), and the appropriate fittings for your application. For a complete solution, see our application-specific fuel line kits.