2022-2025 Acura MDX 3.5L Fuel Pump: Recalls, Symptoms, and Replacement Costs

Vehicle Fitment and Part Numbers

This article specifically covers the in-tank fuel pump assembly for the 2022, 2023, 2024, and 2025 Acura MDX models equipped with the 3.5L V6 gasoline engine.

• OEM Part Number: 17045-TYA-A02

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no recalls specifically for the fuel pump (part number 17045-TYA-A02) on the 3.5L MDX, there are important fuel and engine-related recalls for this generation that owners should be aware of, as the symptoms can sometimes overlap with a failing fuel pump.

NHTSA Campaign Number 25V-031: FI-ECU Software Error

This recall affects 2022-2025 Acura MDX Type-S models (with the 3.0L engine), but it's a critical issue to be aware of in the MDX family. A software error in the Fuel Injection Electronic Control Unit (FI-ECU) can cause the engine to stall or lose power, particularly after a sudden throttle change. The remedy is a software update performed by an Acura dealer, free of charge. While this doesn't directly involve the 3.5L model's fuel pump, the symptom of engine stalling is a key indicator of fuel delivery problems.

NHTSA Campaign Number 23V-751: Engine Connecting Rod Bearing Failure

This significant recall affects a wide range of Honda and Acura vehicles, but the specified MDX models are from the 2016-2020 generation, not the 2022-2025 models this guide focuses on. However, it's a major issue in the brand's recent history involving engine stalling and failure due to a manufacturing defect in the crankshaft. The primary symptoms are abnormal engine noise, stalling, or decreased engine output.

Symptoms of a Failing Fuel Pump

A failing fuel pump rarely dies without warning. It usually provides several clues that it's getting weak. Ignoring these can 🎬 Watch: A visual guide to common failing fuel pump symptoms leave you stranded.

1. Engine Hesitation or Stumbling

The most common symptom is a hesitation or stumble during acceleration. When you press the gas pedal, the engine needs more fuel. A weak pump can't increase the pressure fast enough, causing the engine to feel like it's briefly cutting out or losing power before catching up.

2. Difficulty Starting the Engine

A weak fuel pump may struggle to build enough initial pressure to start the engine. You might find yourself cranking the engine for longer than usual before it finally starts. This happens because the fuel rail isn't being properly primed with fuel.

3. Whining Noise from the Fuel Tank Area

A loud whining or humming sound coming from the rear of the vehicle, near the fuel tank, is a classic sign of a struggling fuel pump motor. The sound may be more noticeable when the vehicle is first turned on. The pump is working harder than it should to move fuel, causing the noise.

4. Engine Stalling, Especially Under Load

If the fuel pump is overheating or failing, it can cause the engine to stall unexpectedly. This often happens when the engine is warm or under heavy load, like climbing a hill or accelerating hard, because the demand for fuel exceeds what the failing pump can supply.

5. Reduced Power and Fuel Economy

A gradual loss of power and a noticeable decrease in fuel efficiency can also indicate a failing fuel pump. The engine isn't receiving the consistent fuel pressure it needs to operate efficiently, forcing it to work harder and burn more gas for the same performance.

Buying a Used Fuel Pump: What to Check

Purchasing a used OEM fuel pump can be a cost-effective alternative to an expensive new unit, but careful inspection is key. A recycled OEM part is often a better choice than a cheap new aftermarket pump due to superior materials, fitment, and longevity.

Physical Inspection Checklist:

• Check the Electrical Connector: The plastic connector and pins should be clean, with no signs of melting, corrosion, or burning. A damaged connector indicates an electrical problem that may have stressed the pump motor.
• Inspect the Housing: Look for any cracks, deep scratches, or signs of warping on the plastic housing. The unit must be perfectly sealed to function correctly in the fuel tank.
• Examine the Fuel Strainer: The strainer (a small mesh filter at the bottom) should be intact. While it will likely be discolored from gas, it shouldn't be clogged with heavy debris or rust particles. Excessive debris could suggest the donor vehicle had a contaminated fuel tank.
• Verify the Part Number: Ensure the part number stamped on the unit is 17045-TYA-A02. This confirms you have the correct part for the 3.5L engine.
• Ask About the Donor Vehicle: If possible, get the mileage from the vehicle the part was removed from. A pump from a lower-mileage vehicle is always preferable. Avoid pumps from vehicles that had collision damage near the fuel tank.

Cost Comparison

The cost of replacing the fuel pump can vary significantly based on the part source and labor rates. Here is a typical breakdown of expected costs:

Replacement Information

Replacing the in-tank fuel pump is a moderately difficult job that involves working with the fuel system. Safety is paramount.

• Difficulty Rating: 3 out of 5
• Estimated Time: 2.0 - 3.0 hours
• DIY Feasible: Yes, for experienced mechanics.

The fuel pump is typically accessed through a panel under the rear seats, which avoids the need to drop the entire fuel tank. The process involves disconnecting the battery, removing the rear seat cushion, 🎬 See how to remove the middle seat for easier access opening the access panel, disconnecting fuel lines and electrical connectors, and removing the locking ring that holds the pump assembly in place.

Frequently Asked Questions (FAQ)