Standard Ignition LDP31 Evaporative Emissions System Leak Detection Pump

OE Leak Detection Pump for EVAP Systems

Standard Ignition LDP31 is a direct-fit evaporative emissions system leak detection pump for select Dodge Ram and Jeep Grand Cherokee applications. It uses engine vacuum to help identify EVAP leaks and supports accurate system monitoring with OE-style electrical and housing design.

Key Features

• Direct-fit OE replacement for the evaporative emissions leak detection pump
• Uses engine vacuum to detect proper EVAP leak conditions
• Precision-calibrated diaphragm and spring help control switch voltage readings
• High-temperature OE-style plastic housing supports fit and durability in demanding underhood conditions
• OE-quality connector and terminals help maintain solid conductivity to the engine wiring harness
• Female connector with 1 connector, 2 hose connectors, and 3 male blade terminals

Detailed Description

Standard Ignition LDP31 is built for EVAP system service on 1998-2002 Dodge Ram 2500, 1998-2002 Dodge Ram 3500, 1998-2001 Dodge Ram 1500, and 1998 Jeep Grand Cherokee. The pump’s diaphragm and spring are calibrated to open and close with the correct response, helping the switch deliver accurate voltage feedback during leak detection. Its OE-style housing and connector layout are designed to match the original part form and electrical interface for a clean replacement on Dodge Ram and Jeep Grand Cherokee applications. This part cross-references Dorman OE Solutions 310-205 for the same application.

What It Helps Fix

• EVAP leak detection faults
• Check engine lights related to evaporative emissions monitoring
• Incorrect switch voltage readings from a worn pump assembly
• Vacuum-related EVAP test failures
• Connector or terminal fit issues at the original pump location

Installation Notes and Tips

Verify the vehicle’s EVAP system diagnosis before replacement and compare the connector, hose routing, and terminal style to the original unit. Fits 1998-2002 Dodge Ram 2500, N/A. Fits 1998-2002 Dodge Ram 3500, N/A. Fits 1998-2001 Dodge Ram 1500, N/A. Fits 1998 Jeep Grand Cherokee, N/A.

Quality Assurance

Standard Ignition manufactures this replacement pump with OE-style materials, connector terminals, and fitment details to support consistent electrical contact and proper installation on the listed vehicles.