Ensure reliable fuel delivery, prevent engine stalling, and restore factory performance by replacing worn-out fuel pumps with the ‌GM Genuine 2204945 assembly‌, designed as a direct upgrade for ‌2204852‌. This guide covers compatibility, failure symptoms, installation steps, and why OEM pumps outperform aftermarket alternatives in durability, pressure accuracy, and system integration for ‌GM Silverado, Sierra, and Tahoe/Suburban models‌.

Product Overview & Key Features‌
Part Numbers & Applications‌
2204945‌:
Replaces‌: 2204852 (discontinued after 2021), 13442238.
Compatibility‌:
GM Silverado/Sierra 1500 (2019–2024)‌ with 5.3L/6.2L V8.
Chevrolet Tahoe/Suburban (2021–2024)‌ with 3.0L Duramax diesel.
Features‌:
Brushless motor (200+ psi), PTFE-lined hoses (ethanol-resistant).
Integrated fuel filter (10µm mesh), anti-vapor lock design.
Technical Specifications‌
Flow Rate‌: 800 LPH (supports 700+ HP applications).
Voltage‌: 12V/90A, PWM-controlled for adaptive fuel demand.
Material‌: Stainless steel housing, nitrile seals (E85 compatible).
Wiring‌: 4-pin connector with shielded harness (reduces EMI interference).
Warranty‌:
3 years/75k miles‌ – Covers motor failure, leaks, and sensor defects.
Symptoms of a Failing 2204852/2204945 Pump‌
Hard Starts‌: Cranks but no ignition (codes ‌P0087‌, ‌P0231‌).
Engine Stalling‌: Sudden power loss at idle or under load.
Whining Noise‌: Loud buzzing from the fuel tank.
Poor MPG‌: Fuel trims exceeding ±15% (code ‌P0171/P0174‌).
Contamination Damage‌: Clogged filter sock (metal debris in tank).
OEM vs. Aftermarket Comparison‌
Feature‌ ‌2204945 (OEM)‌ ‌Aftermarket Pumps‌
Motor Type‌ Brushless (no carbon wear) Brushed (prone to commutator failure)
Pressure Control‌ PWM-synced with ECM for precise flow Fixed-speed (overworks ECU)
Seal Material‌ E85-resistant nitrile Buna-N (swells with ethanol)
Filter Sock‌ 10µm stainless steel mesh 30µm nylon (clogs faster)
Warranty‌ Covers labor if dealer-installed 1-year limited (no labor coverage)
Installation Guide‌
Tools Required‌:
Fuel line disconnect tool, torque wrench (5–30 Nm), jack stands, safety gloves.
Steps‌:
Depressurize System‌:
Remove fuel cap, disconnect fuel pump relay, start engine until it stalls.
Drop Fuel Tank‌:
Support tank with a transmission jack, disconnect lines/straps.
Replace Assembly‌:
Remove lock ring (counterclockwise), swap old pump with 2204945.
Align arrow on filter sock toward the front of the tank.
Reassemble & Test‌:
Torque lock ring to ‌45 Nm (33 ft-lbs)‌, reconnect electrical/vent lines.
Prime system by cycling ignition 3x before starting.
Where to Buy & Red Flags‌
Trusted Suppliers‌:
GM dealerships, GMpartsDirect, GMPartsGiant.
Avoid‌:
Pumps sold without Genuine GM hologram stickers.
“Universal” pumps claiming compatibility with 2204852.
Maintenance Tips‌
Replace fuel filter sock every ‌50k miles‌ (GM part# 13590529).
Use TOP TIER detergent gasoline to prevent injector clogs.
Inspect pump wiring for chafing during tire rotations.
FAQ‌

Q: Does 2204945 fit a 2020 Silverado 2500HD?‌
A: No – Use HD-specific pump 84093645 for 6.6L gas engines.

Q: Can I reuse my old fuel level sender with 2204945?‌
A: Yes – The assembly retains the same sender design as 2204852.

Q: Why does my pump whine after replacement?‌
A: Air in the system – Prime it again or check for cracked hoses.

Q: Will aftermarket pumps void my powertrain warranty?‌
A: Yes – Non-OEM parts risk denial of coverage for fuel-related failures.

Q: Is 2204945 compatible with diesel?‌
A: Yes – Works with 3.0L Duramax (use GM-approved diesel additives).

Conclusion‌

The ‌GM 2204945 fuel pump assembly‌ provides a direct, high-performance replacement for the discontinued 2204852, ensuring precise fuel delivery, E85 compatibility, and extended service life for GM trucks and SUVs. OEM engineering eliminates the risks of aftermarket failures—like brushed motor wear and poor ethanol resistance—while maintaining seamless integration with factory ECUs. Protect your engine and warranty by choosing Genuine GM components.

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