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Standard Ignition PR21 Fuel Injection Pressure Regulator
| Brand | Standard Ignition PR21 |
|---|---|
| Adjustable | No |
| Automotive Performance Item | No |
| Contents | Includes Instruction Sheet & Caution Sheet |
| Fuel Type | Gas |
| Functions | Regulator |
| Material | Cast Iron |
| New or Reman | New |
| Nipple Orientation | Straight |
| Number of outlets | 1 |
| Operating Pressure - PSI | 41 psi |
| Regulator Finish | Yellow Dichromium |
| Regulator Material | Steel |
| Type | Return |
| Fits | Jeep · 12 vehicles |
Leak-resistant design. Robust engineering helps reduce leakage in fuel delivery.
Application-specific fit. Built for proper fit and form with precise fuel regulation.
Steel construction. Made with cast iron and a yellow dichromium finish.
Cross-references Gates 21067, Gates 22801 and SKP SKPR21 for the same application. See all 14.
Fuel Pressure Control for Jeep Applications
The Standard Ignition PR21 fuel injection pressure regulator is a new, application-specific replacement for select Jeep fuel systems. It is built with a cast iron body, steel regulator construction, and a yellow dichromium finish to support consistent fuel delivery and reliable engine operation.
Compatible with 1987-1990 Jeep Cherokee, 1987-1990 Jeep Comanche, and 1987-1990 Jeep Wagoneer, this PR21 regulator is engineered for the correct fit and form in return-style fuel injection systems.
Key Features
- Fuel injection pressure regulator for gas applications
- Return-style design with 41 psi operating pressure
- Application-specific fit for Jeep Cherokee, Comanche, and Wagoneer
- Cast iron body with steel regulator construction
- Straight nipple orientation with 2 inlets and 1 outlet
- New replacement part with instruction sheet and caution sheet included
Detailed Description
Standard Ignition PR21 is a precision-engineered fuel injection pressure regulator designed to maintain proper fuel pressure for consistent injector performance. Its robust construction helps resist leakage, while the application-specific design supports proper fitment on select Jeep Cherokee, Jeep Comanche, and Jeep Wagoneer models from 1987 through 1990. This part cross-references Gates 21067 and 22801 for the same application.
Common Issues It Can Help Address
- Fuel pressure that is too high or too low for stable engine operation
- Hard starting caused by inconsistent fuel delivery
- Rough idle related to unstable injector pressure
- Fuel leakage at a worn or damaged regulator
- Poor drivability from an aging return-style regulator
Installation Notes and Tips
Verify the vehicle uses a return-style fuel injection system and confirm the operating pressure requirement before installation. Match the inlet and outlet layout, straight nipple orientation, and mounting location to the original part. Clean the surrounding fuel system connections before removal, and follow the included instruction sheet and caution sheet during service.
Quality Assurance
Standard Ignition manufactures this PR21 regulator with control over the production process from components through finished product, supporting consistent build quality and fit. The design focuses on proper fuel delivery and resistance to leakage for dependable service in the specified Jeep applications.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1990 | Jeep | Cherokee | 4.0L | L6 | N/A | — |
| 1990 | Jeep | Comanche | 4.0L | L6 | N/A | — |
| 1990 | Jeep | Wagoneer | 4.0L | L6 | N/A | — |
| 1989 | Jeep | Cherokee | 4.0L | L6 | N/A | — |
| 1989 | Jeep | Comanche | 4.0L | L6 | N/A | — |
| 1989 | Jeep | Wagoneer | 4.0L | L6 | N/A | — |
| 1988 | Jeep | Cherokee | 4.0L | L6 | N/A | — |
| 1988 | Jeep | Comanche | 4.0L | L6 | N/A | — |
| 1988 | Jeep | Wagoneer | 4.0L | L6 | N/A | — |
| 1987 | Jeep | Cherokee | 4.0L | L6 | N/A | — |
| 1987 | Jeep | Comanche | 4.0L | L6 | N/A | — |
| 1987 | Jeep | Wagoneer | 4.0L | L6 | N/A | — |
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