Maintain steady fuel pressure at the injectors with the Standard Ignition Fuel Injection Pressure Regulator PR78. It installs as a direct-fit replacement for the 1990-1994 Mazda 323 (L4-1.6L and L4-1.8L), 1992-1993 Mazda MX-3 (L4-1.6L), and 1990-1994 Mazda Protege (L4-1.8L), and is tuned to match these Mazda engines' fuel requirements. This gas-system regulator controls fuel pressure by managing return flow, helping keep fuel delivery to the injectors consistent across driving conditions. It operates at 42 PSI and uses an angled nipple orientation.
- Consistent fuel delivery: designed to hold steady pressure for normal fuel metering at the injectors.
- Sealed and heat-tolerant: leak-resistant seals and thermal resistance intended for reliable operation in varied conditions.
- Validated build: engineering validation includes 200+ hours of vibration testing plus 1000+ hours of extreme heat and cold operational and on-vehicle testing.
- Ready to install: includes an O-ring and a caution sheet.
Constructed from corrosion-resistant, high-durability materials. Country of origin: Mexico.
Interchange: 21890 · PRDL190 · 2-19525 · 219525 · BP0113280 · 800-190 · 800190 · Manufacturer part number PR78
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the PR78 fuel pressure regulator do?
It regulates fuel pressure by managing return flow, helping keep fuel delivery to the injectors consistent. This PR78 unit operates at 42 PSI.
Which vehicles does the PR78 fit?
It's a direct-fit replacement for the 1990-1994 Mazda 323 (L4-1.6L, L4-1.8L), 1992-1993 Mazda MX-3 (L4-1.6L), and 1990-1994 Mazda Protege (L4-1.8L). Check the Buyer's Guide tab to confirm your vehicle.
Does the PR78 include an O-ring?
Yes. It includes an O-ring and a caution sheet.
What is the operating pressure of this regulator?
This regulator operates at 42 PSI.
What signs suggest the fuel pressure regulator may need replacing?
Signs may include rough idle, hard starting, poor fuel economy, or a fuel odor. Diagnose the cause first, since these symptoms can have other sources.
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