2016-22 Buick Envision & 2019-22 Cadillac XT4 AWD Fuel Pump: Crank-No-Start Issues and Replacement

Symptoms of a Failing Fuel Pump

A failing in-tank fuel pump in your Buick Envision or Cadillac XT4 will typically give you several warning signs. The most common issue is a 'crank, no start' condition, where the engine turns over but never fires up. You may also experience less severe symptoms leading up to a complete failure.

• Engine Cranks, But Won't Start: This is the most definitive sign. You'll hear the starter trying to turn the engine on, but it won't catch and run because it isn't receiving fuel. 🎬 See how to diagnose a car that cranks but won't start. This can be intermittent at first before becoming a permanent problem.
• Engine Stalling: The vehicle may start and run for a short time, then stall unexpectedly, especially under load or when the engine warms up. This happens when the pump overheats and temporarily stops working.
• Hesitation and Lack of Power: During acceleration, the vehicle may hesitate, sputter, or feel sluggish. This indicates the pump is struggling to supply enough fuel to meet the engine's demands.
• Whining Noise From Rear of Vehicle: A failing fuel pump motor often makes a loud, high-pitched whining or humming sound that is audible from the rear seat area, near the fuel tank. A healthy pump makes a quiet hum for a few seconds when you first turn the key.
• Check Engine Light: While many issues can trigger a Check Engine Light, a failing fuel pump can cause lean running conditions or low fuel pressure codes, such as P0087 (Fuel Rail/System Pressure - Too Low).

Vehicle-Specific Issues, Recalls, and Bulletins

While these vehicles share a platform, there are some distinct issues to be aware of for each model.

2016-2017 Buick Envision: High-Pressure Fuel Pump Recall

Owners of 2016-2017 Buick Envision vehicles should be aware of a safety recall concerning a different part of the fuel system. NHTSA Recall #18V358 (GM Recall #18188) was issued for the engine-mounted High-Pressure Fuel Pump (HPFP), not the in-tank pump this guide covers. The HPFP could detach from its mounting flange, potentially damaging the high-pressure fuel line. A damaged fuel line could cause a fuel leak, increasing the risk of a fire. Symptoms of this issue can be similar to a failing in-tank pump, so it's critical to have a professional diagnosis if you experience fuel-related problems in these model years.

2019-2022 Cadillac XT4: Reports of Premature Failure

There are anecdotal reports of premature failure of the fuel pump module in the Cadillac XT4, leading to the common 'crank, no start' symptom. Some owners have experienced repeated failures even after replacement. While no formal recall has been issued for this specific problem in the US market, it is a known issue in repair communities.

Additionally, a Special Coverage program (N202324990) was issued for the evaporative emissions purge pump on 2019-2020 XT4 models, which can also trigger a Check Engine Light but is unrelated to the main fuel delivery pump.

Buying a Used AWD Fuel Pump: What to Look For

A used OEM fuel pump can be a reliable and cost-effective alternative to an expensive new unit, especially when compared to lower-quality aftermarket options. Here’s what to inspect before you buy:

• Verify the Part Number: Match the part number from your old pump to the used one. Cross-reference compatible numbers like 13533761, 13512606, and 13507247 to ensure you're getting the right part.
• Confirm AWD Fitment: Double-check that the donor vehicle was an All-Wheel Drive model. FWD pumps will not work. Ask the seller to confirm the donor vehicle's drivetrain.
• Inspect the Electrical Connector: This is the most important check. Look closely at the plastic connector and the electrical pins on top of the pump assembly. Any signs of melting, browning, or charring indicate the pump was overheating and failing. Do not buy a pump with a damaged connector.
• Check the Plastic Housing: Inspect the entire plastic assembly for cracks, especially around the fuel line connections and the mounting flange. A cracked housing can cause dangerous fuel leaks.
• Consider Mileage: While fuel pumps don't have a set lifespan, one from a lower-mileage vehicle is always preferable. Aim for a pump from a vehicle with under 100,000 miles if possible.
• Ask About a Warranty: Reputable sellers of used parts will offer a warranty. This protects you in case the pump is dead on arrival or fails shortly after installation.

Replacement Overview and Difficulty

Replacing the in-tank fuel pump is an advanced DIY job that requires extreme caution due to the risk of fire.

• Difficulty Rating: 4 out of 5
• Estimated Time: 2-4 hours
• DIY Feasible: Yes, for experienced mechanics with proper safety precautions.

The general process involves disconnecting the battery, relieving fuel system pressure, and gaining access to the top of the fuel tank. For the Envision and XT4, access is typically through a panel under the rear seats. After removing the access cover, you must disconnect the fuel lines and electrical connector. A special lock ring tool is required to remove the ring that holds the pump module in the tank. The old pump is then lifted out, and the new one is installed with a new tank seal. 🎬 Watch this step-by-step walkthrough of a Buick fuel pump replacement. Working with gasoline and its vapors is extremely hazardous; always work in a well-ventilated area away from any ignition sources and have a Class B fire extinguisher nearby.

Cost Comparison: New vs. Used

The cost to replace the fuel pump can vary significantly based on the part source and labor rates.

Frequently Asked Questions (FAQ)

Compatible Part Numbers

The following OEM part numbers are associated with this AWD in-tank fuel pump module. Part numbers can supersede over time, so always confirm fitment with the seller.

• 13533761
• 13512606
• 13507247
• 13512603
• 84532384
• 84525447