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Dorman 904-8040 Fuel Injector O-Ring Kit
Fuel Injector Seal Replacement
Dorman 904-8040 is a fuel injector O-ring kit for engine fuel system service where injector seals need to be renewed during maintenance or repair. It includes fluoroelastomer seals in black, blue, and purple, built to handle exposure to fuel, oil, and high engine temperatures.
For technicians servicing fuel injector O-ring replacement on Honda Civic or Toyota Corolla applications, this kit provides the sealing components needed for a full injector reseal on the specified engine. The Dorman 904-8040 part number is also referenced as 21261987 for cross-checking.
Key Features
- Fuel injector O-ring kit for engine service work
- Fluoroelastomer construction for resistance to heat, fuel, and oil exposure
- Round-profile seals with multiple inside diameter and thickness specifications
- Includes injector replacement seals and injector washers for injector reseal service
- Dorman 904-8040 for parts lookup and catalog matching
Detailed Description
This Dorman fuel injector O-ring kit is built for replacing worn injector sealing components on the specified engine. The seal material is selected for durability in demanding underhood conditions, helping maintain a proper seal at the injector body where fuel pressure, temperature cycling, and oil exposure can affect performance. When servicing Honda Civic or Toyota Corolla fuel injector seals, using the correct O-ring dimensions is important for restoring injector sealing integrity. Dorman 904-8040 is intended for applications that require a complete injector seal refresh with the listed seal and washer components.
What It Helps Fix
- Fuel seepage around injector seals
- Hard starting caused by injector seal leakage
- Fuel odor from deteriorated injector O-rings
- Rough idle related to vacuum or fuel sealing issues at the injector
- Injector service problems after intake or fuel rail removal
Installation Notes
Confirm injector seal dimensions and engine application before installation. Clean the injector and rail sealing surfaces thoroughly, and replace seals only on a cool engine. Lightly lubricate new O-rings with clean engine oil or approved fuel-system lubricant during assembly to reduce pinching and tearing. Verify proper injector seating and inspect for leaks after startup.
Quality Assurance
Dorman manufactures replacement service parts for automotive repair, and this kit uses fluoroelastomer materials selected for exposure to fuel, oil, and elevated temperatures. Part number 904-8040 can be matched against cross-reference 21261987 during catalog verification.
| Brand | Dorman |
|---|---|
| Part Number | 904-8040 |
| Material | Fluoroelastomer |
| Color | Black |
| Color | Blue |
| Color | Purple |
| Inside Diameter | 31 |
| Inside Diameter | 34 |
| Inside Diameter | 35 |
| Thickness | 1.65 |
| Thickness | 2.5 |
| Thickness | 3 |
| Outside Diameter | 36 |
| Outside Diameter | 38.3 |
| Outside Diameter | 40 |
| Rim Shape | Round |
| O-Ring Quantity | 6 |
| Package Contents | 6 injector o-ring replacement seals; 6 injector washers |
This part fits 0 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.