Dacall EVAP Leak Detection Pump 4861959AA Replacement Module — Direct-Fit, Diaphragm-Switch Leak Sensor

Dacall 4861959AA Evaporative Emissions System Leak Detection Pump is an OEM-quality EVAP integrity module that monitors pressure and vacuum changes to help detect small fuel vapor leaks and restore proper emissions control.

This replacement EVAP leak detection pump (also called an EVAP system integrity module) fits a broad range of FCA vehicles and is engineered to the specifications of the original part numbers it replaces. Built to withstand high under-hood temperatures and fuel exposures, the unit incorporates a diaphragm-switch sensing assembly and OE-style electrical connector so you get reliable diagnostics and stable performance without modifying factory wiring or mounting points.

How does this pump find EVAP leaks in my vehicle?

The module senses tiny shifts in manifold pressure and vacuum via a precision diaphragm and switch. When the system draws or holds pressure, the pump reports deviations that indicate leaks as small as 0.020 in (0.5 mm), supporting accurate onboard diagnostics and helping technicians pinpoint faults.

• Diaphragm-switch architecture for sensitive pressure change detection
• Detects leaks down to 0.020 in (0.5 mm)
• Calibrated response for consistent diagnostic readings

Will this unit fit my car and replace my OEM part?

Yes—this Dacall module is designed to be a direct-fit replacement for multiple OEM part numbers and a wide list of model years. It replaces common factory references such as 4861959AA/AB/AC and 52855827AA/AB and fits many Alfa Romeo, Chrysler, Fiat, Dodge, Jeep, and Ram vehicles listed by year and model.

• Replaces 4861959AA, 4861959AB, 4861959AC, 52855827AA/AB and others
• Fits models including Alfa Romeo 4C, Fiat 500/500L, Dodge Durango/Nitro, Jeep Grand Cherokee/Liberty, Ram 1500 and ProMaster variants
• Check vehicle-specific fit; excludes Durango and Grand Cherokee 2016–2017 models

How is the Dacall pump built to last in harsh engine compartments?

Materials and assembly mirror OE standards: the housing resists extreme temperatures, the sealing uses fuel-compatible O-rings, and the diaphragm is precision-calibrated for long-term stability. The unit’s OE-style connector ensures a secure electrical interface to minimize intermittent faults caused by poor connections.

• High-temp automotive-grade housing rated -40°F to 275°F
• Fuel-resistant O-ring for reliable sealing against vapors
• OE-style electrical connector for solid signal transmission

What diagnostic or maintenance benefits can I expect after installing it?

With accurate leak detection you’ll reduce false EVAP fault codes and support quicker troubleshooting during service. Replacing a failing module often restores normal EVAP pressure test behavior, helping the vehicle complete readiness checks and improving the accuracy of downstream repairs.

• Helps eliminate intermittent EVAP codes from faulty sensing
• Supports faster, more accurate technician diagnostics
• May help the vehicle complete emission-system readiness cycles

Who is this for: technicians, independent repair shops, and DIYers who need a dependable, direct-fit EVAP leak detection pump compatible with a broad range of FCA models. If you require an OEM-quality replacement that meets original fitment and sensing precision for Alfa Romeo, Chrysler, Fiat, Dodge, Jeep or Ram vehicles listed, this Dacall 4861959AA module is engineered to match those needs while resisting under-hood heat and fuel exposure.