YCT EVAP Leak Detector Pump for Chrysler Dodge Jeep Ram — 4B1591 Direct-Replacement, OE Fit

The YCT EVAP 310-215 is a direct-replacement evaporative emissions fuel vapor leak detector pump compatible with many Chrysler, Dodge, Jeep and Ram models using OE 4B1591 and related numbers.

This leak detector pump (also listed as part number 4B1591 and cross-referenced to ESM1001, LDP14/VDP14 and several OEM codes) restores proper EVAP system diagnostics by pressurizing and testing the vehicle’s fuel-vapor containment. It arrives as a complete replacement unit designed to match original mounting and electrical connector locations so installation is straightforward for technicians or experienced DIYers. Before ordering, confirm the vehicle year and exact OEM part number to ensure fitment and avoid returns.

How do I know this pump fits my vehicle?

Fitment is determined by matching the vehicle model year and the original equipment part number. Use your current pump’s part number or the vehicle’s VIN to cross-check compatibility with the list of supported models and OE references.

• Check your existing part number against: 4B1591, 4861962AA/AB/AC, 4891685AA/AB, 52129436AB.
• Compatible ranges include Chrysler 200/300/Pacifica/Town & Country and others listed in the product details.
• If unsure, compare connector shape and mounting points with photos before purchase.

What does this replacement pump do for my car?

The EVAP leak detector pump creates controlled pressure or vacuum in the fuel vapor system so the vehicle can detect leaks and meet emissions test requirements. Replacing a failed pump restores the EVAP system’s ability to run self-checks, clear related fault codes, and help maintain correct evaporative emissions control.

• Restores EVAP system diagnostic testing that a defective pump prevents.
• Helps clear diagnostic trouble codes tied to vapor leaks when the system is otherwise healthy.
• Matches original mounting and electrical connectors for a direct swap.

How difficult is installation and what should I prepare?

Installation is moderate difficulty — familiar to anyone comfortable with underbody or trunk-area vehicle work. Expect basic hand tools, a safe lift or jack stands, and about 30–90 minutes depending on access and experience. If you lack mechanical experience, have a technician perform the swap for correct sealing and electrical reconnection.

• Tools: ratchet set, screwdrivers, possible trim removal tools, jack stands or hoist.
• Steps: disconnect battery, locate pump, unplug electrical connector, remove fasteners, swap unit, reattach and test.
• Inspect hoses and seals and replace any brittle or cracked lines during installation.

Will this pump match OEM performance and reliability?

The YCT EVAP 310-215 is built to replace the original unit and is advertised to correctly replace the OEM part numbers listed. Proper fit and connector compatibility are emphasized; replacing a degraded pump typically returns EVAP testing and leak detection function to expected operation when installed correctly.

• Cross-referenced to multiple OEM part numbers for broad compatibility.
• Designed to match original mechanical and electrical interfaces for plug-and-play replacement.
• Verify part picture and OE code prior to purchase to reduce compatibility issues.

Who is this for: technicians, repair shops and DIY mechanics working on mid-2000s to late-2010s Chrysler, Dodge, Jeep and Ram vehicles that show EVAP leak codes, failed readiness tests, or otherwise need the leak detector pump replaced. If you need a direct replacement for OE 4B1591 or any of the referenced cross numbers and you can confirm fitment from your vehicle and part photos, this YCT pump offers a cost-effective solution to restore EVAP leak testing.