Katerina Swanson
Replacing the fuel rail on an Evo 9 is a straightforward process. There are a number of kits available on the market that include everything you need to replace the OEM fuel rail. Some kits include a billet adapter fitting to replace the plug in the top port, while others include a pre-fabricated -6AN PTFE hose to replace the OEM rubber hose. It is also possible to replace the factory bolts that secure the fuel rail to the intake manifold with titanium bolts.
| Characteristics | Values |
|---|---|
| What is being replaced? | Factory bolts that secure the fuel rail to the intake manifold |
| What is it being replaced with? | Titanium bolts |
| What should you be careful of? | Losing pressure, fuel leaks, and the spacer falling out when removing bolts |
| What is included in the Radium Engineering 20-0119 Fuel Rail Kit? | Billet adapter fitting, a pre-fabricated -6AN PTFE hose (16.0-ST-ST) hose, a -6AN adapter |
| What does the kit replace? | The OEM rubber hose and restrictive 2 bolt flange |
| What is the benefit of the Radium fuel rail? | It eliminates the OEM 2 bolt inlet flange which uses a restrictive 0.22" (5.7mm) orifice |
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$40.99
What You'll Learn
Removing the fuel rail from the car
Next, disconnect the spark plug wire retaining clips from the fuel rail. Depending on the routing of the spark plug wires, you may need to disconnect and remove them for the removal of the fuel rail. Grasp the fuel rail and pull it firmly upward away from the intake manifold. The fuel injectors will come out with the fuel rail.
If you don't already have your fuel rail completely off the car, it is recommended that you remove one bolt at a time and replace it with a new bolt to make sure no pressure is lost and no fuel leaks. Be careful not to let the spacer fall out once you remove the bolt.
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Replacing bolts with titanium bolts
When replacing a fuel rail on an Evo 9, it is important to note that the OEM fuel rail has plenty of flow, and the Evo 8-9 rail is identical except for an additional opening at the end for the FPR.
If you are looking to replace the bolts that secure the fuel rail to the intake manifold with titanium bolts, it is recommended to remove one bolt at a time and replace it with a titanium bolt to ensure no pressure is lost and no fuel leaks. Be careful not to let the spacer fall out once you remove the bolt.
There are fuel rail kits available that include everything required to simply unbolt and replace the OEM fuel rail. These kits may also include a billet adapter fitting to replace the plug in the top port, allowing for a pressure gauge/adapter to be installed.
Some aftermarket fuel rails, such as the Radium Engineering 20-0119 Fuel Rail Kit, eliminate the OEM 2 bolt inlet flange and include a pre-fabricated -6AN PTFE hose to replace the OEM rubber hose.
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Replacing the OEM rubber hose
To replace the OEM rubber hose on an Evo 9 fuel rail, you can use a Radium Engineering 20-0119 Fuel Rail Kit (Evo 4-9). This kit includes a pre-fabricated -6AN PTFE hose (16.0-ST-ST) to replace the OEM rubber hose and a restrictive 2-bolt flange. The kit also comes with a -6AN adapter for connecting the PTFE hose to the fuel rail inlet port.
When replacing the fuel rail, it is recommended to remove one bolt at a time and replace it with a new one to ensure no pressure is lost and no fuel leaks. Be careful not to let the spacer fall out once the bolt is removed.
The Radium fuel rail eliminates the OEM 2-bolt inlet flange, which uses a restrictive 0.22" (5.7mm) orifice. It also makes it easy to adapt to common -AN fuel hoses on both ends of the fuel rail.
Note that the basic fuel rail option does not include fittings, which must be purchased separately.
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Replacing the OEM fuel rail
If you're looking for a more aesthetic upgrade, JDC offers a titanium fuel rail hardware kit that replaces the factory bolts securing the fuel rail to the intake manifold. This kit is designed for the Evo 8/9/X and may fit other models, but it's important to check the correct size before ordering. When replacing the bolts, it's recommended to remove one bolt at a time and replace it with the titanium bolt to avoid losing pressure or causing fuel leaks. Be careful not to let the spacer fall out once the bolt is removed!
Another option for replacing the OEM fuel rail is to use an aftermarket EVO VIII/IX fuel rail. However, keep in mind that some users have reported that upgrading the fuel rail on an Evo 9 provides no noticeable gains in performance. The OEM fuel rail has plenty of flow, and the only difference with the Evo 8-9 rail is an additional opening at the end for the FPR.
Regardless of the kit or method chosen, it's important to follow the manufacturer's instructions and take the necessary precautions when working with fuel systems to ensure a safe and successful replacement.
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Upgrading the fuel rail
The Radium kit eliminates the OEM 2 bolt inlet flange, which uses a restrictive 0.22" (5.7mm) orifice. It also includes a pre-fabricated -6AN PTFE hose to replace the OEM rubber hose. This hose is designed to be easily adapted to common -AN fuel hoses on both ends of the fuel rail.
The JDC kit is designed to replace the factory bolts that secure the fuel rail to the intake manifold with titanium bolts. It is important to remove one bolt at a time and replace it with the titanium bolt to ensure no pressure is lost and no fuel leaks.
It is worth noting that some sources suggest that upgrading the fuel rail on an Evo 9 may not provide any significant gains in performance, as the OEM fuel rail has plenty of flow. However, others have used the Evo 9 fuel rail for the fuel side of a wet kit without issue. Ultimately, the decision to upgrade depends on the specific needs and goals of the vehicle owner.
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Frequently asked questions
You can purchase a fuel rail kit that includes everything required to unbolt and replace the OEM fuel rail.
It is recommended that you remove one bolt at a time and replace it with a new one to ensure no pressure is lost and no fuel leaks.
The Evo 9 fuel rail has an additional opening at the end for the FPR, but the OEM fuel rail has plenty of flow and there are no gains to be had from upgrading.
