Dacall EVAP Leak Detection Pump 4861959AA — Replacement EVAP Integrity Module, OE-Style Connector, Diaphragm-Switch

The Dacall 4861959AA Evaporative Emissions System Leak Detection Pump is an OEM-quality EVAP integrity module that detects tiny leaks and restores proper evaporative emissions monitoring for compatible Chrysler, Dodge, Jeep, Ram, Fiat, and Alfa Romeo models.

This EVAP Leak Detection Pump (also sold under reference numbers 4861959AB, 4861959AC, 52855827AA, and similar OEM codes) replaces the factory evaporative system integrity module and is engineered to measure pressure and vacuum changes with a diaphragm-switch sensing system. It’s built to withstand automotive under-hood temperatures and resist fuel exposure while providing the electrical and mechanical fit needed for reliable diagnostics and system operation.

How does this pump detect EVAP leaks?

The module uses a calibrated diaphragm and switch that responds to small pressure and vacuum changes inside the EVAP canister and plumbing. When the module senses variations beyond expected tolerances, it signals the vehicle’s control system to flag an evaporative leak condition, enabling accurate diagnostics.

• Diaphragm-switch sensing detects leaks down to 0.020 in (0.5 mm).
• Precision calibration ensures repeatable response to pressure changes.
• Direct electrical interface via OE-style connector for stable signaling.

Which vehicles will this Dacall EVAP module fit?

This unit is compatible with a range of Fiat-Chrysler Automobiles platforms; verify fitment by part number and vehicle year before purchase. It fits many Ram, Jeep, Dodge, Chrysler, Fiat, and Alfa Romeo models — including recent Ram 1500 and ProMaster vans, mid‑generation Grand Cherokee and Durango lines (excluding specific 2016–2017 Durango/Grand Cherokee models), and small Fiat and Alfa Romeo cars.

• Alfa Romeo 4C (2015–2020).
• Chrysler Aspen (2007–2009); Dodge Durango, Nitro, and Ram listings.
• Fiat 500 (2012–2019) 1.4L and 500L (2014–2016).
• Ram 1500 (2009–2010; 2011–2024), ProMaster 1500/2500/3500, ProMaster City, Jeep Grand Cherokee and Liberty where specified.

What build features affect durability and reliability?

The Dacall module is manufactured with automotive-grade materials and designed for the temperature and chemical stresses typical of EVAP systems. Those construction choices reduce premature failure and help maintain a consistent seal and electrical connection throughout service life.

• High-temperature housing rated from -40°F to 275°F.
• Fuel-resistant O-ring for dependable sealing at pipe and canister interfaces.
• OE-style connector and mounting form factor for secure installation and signal stability.

Will this replace my original part number and support diagnostics?

Yes—this Dacall module is intended as an OEM-quality replacement for multiple factory part numbers, enabling proper EVAP diagnostics and helping the vehicle’s onboard systems reestablish correct leak-detection function. Always confirm your vehicle’s required part code and harness compatibility prior to installation.

• Replaces part numbers such as 4861959AA, 4861959AB, 52855827AA, 4B1593, and others.
• Calibrated diaphragm supports accurate on‑board leak tests and error reporting.
• Designed to match factory electrical and mounting interfaces for straightforward swap-in service.

Who is this for: This Dacall EVAP Leak Detection Pump is for owners, technicians, and independent repair shops replacing a failed or suspect EVAP integrity module on compatible Chrysler, Dodge, Jeep, Ram, Fiat, and Alfa Romeo vehicles. Choose this unit when you need an affordable, OE-form replacement that restores accurate evaporative leak detection and integrates cleanly with factory diagnostic systems. Confirm vehicle fitment against the listed model years and excluded years (for certain Durango and Grand Cherokee models) before ordering to ensure compatibility.