TOYOTA 22602-5B320 Fuel Injection Pump Filter Sub-Assembly

The genuine Toyota 22602-5B320 fuel injection pump filter sub-assembly (FILTER SUB-ASSY, FUEL INJECTION PUMP, NO.2) is a premium-quality original OEM component responsible for protecting the fuel delivery system. This microfilter is positioned directly on the inlet side or within the internal circuit of the fuel injection pump, ensuring that only completely clean, contaminant-free fuel enters the high-pressure system.

Technical Features and Operating Principle

The injection pump filter sub-assembly plays a vital role in extending the service life of injection systems. Modern injection pumps operate with extremely fine tolerances and micron-level clearances; therefore, even the smallest dust particles or metal shavings can cause severe mechanical damage, wear, or seizure of internal pump components.

• Effective Filtration: Its specialized filter medium captures microscopic suspended contaminants and fine sediment.
• OEM Quality: Dimensional accuracy adhering strictly to factory Toyota specifications guarantees a precise fit and leak-free sealing, preventing air ingress into the fuel system.
• Durability: Highly resistant to chemical fuel compositions, additives, as well as thermal and pressure fluctuations within the engine bay.

Symptoms of Wear and Clogging

Because the filter continuously collects contaminants, it can become clogged over time, restricting free fuel flow. Common signs of clogging or malfunction include:

• Power Loss: The engine does not receive sufficient fuel under load, resulting in hesitation, jerking, or sluggish acceleration.
• Hard Starting: Especially during cold starts, the system struggles to build up the necessary starting pressure.
• Rough Idle: Fluctuating fuel supply can cause unstable or erratic engine idling.
• Fault Codes: A drop in fuel delivery pressure may trigger diagnostic trouble codes in the engine control unit (ECU) and illuminate the "Check Engine" warning light.

Regular maintenance and timely replacement of this filter are essential to prevent costly repairs to the injection pump and fuel injectors.