Standard Motor Products LDP05 EVAP Leak Detection Pump

The Standard Motor Products LDP05 is an evaporative emissions system (EVAP) leak detection pump designed to detect fuel vapor leaks in your vehicle's emissions control system. This critical emissions component helps prevent harmful fuel vapors from escaping into the atmosphere while ensuring compliance with federal emissions standards.

How It Works:

The LDP05 uses engine vacuum to pressurize the EVAP system to approximately 7.5 inches of water (0.25 psi) during diagnostic testing. A spring-loaded diaphragm, controlled by a 3-port solenoid, pumps clean air into the sealed EVAP system through check valves. The integrated reed switch monitors diaphragm position, allowing the powertrain control module (PCM) to detect pressure drops that indicate leaks. If a leak is detected, the system triggers a diagnostic trouble code and illuminates the check engine light.

Key Features:

• Direct-fit replacement for OEM leak detection pump
• Integrated 3-port vacuum solenoid for precise pressure control
• Spring-loaded diaphragm pump mechanism
• Built-in reed switch for position monitoring
• Includes canister vent valve seal
• Inlet and outlet check valves for one-way airflow
• Remote air filter connection prevents contamination

Common Applications:

This leak detection pump is used in various vehicles equipped with EVAP emissions systems. When the LDP fails, common symptoms include persistent check engine lights, EVAP-related diagnostic codes (P0440, P0442, P0455, P0456, P1494), increased fuel consumption, and gasoline odors near the fuel tank area.

Standard Motor Products has been manufacturing quality replacement parts since 1919 and is traded on the NYSE, providing reliable aftermarket solutions backed by manufacturer warranty coverage.