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L5P Duramax Fuel Tank Pump Module Kit | GM 86534329
Replace a weak or failed L5P in-tank lift pump with the genuine GM module. GM 86534329 is the current OEM fuel tank / fuel pump module kit for 2020–2025 Silverado and Sierra HD trucks with the 6.6L Duramax. It sits in the tank, feeds the high-pressure pump, and includes the fuel-level sender. A failing module can cause hard start, no-start, low supply pressure, a noisy tank, or a fuel gauge that reads wrong. This kit supersedes 84777079, 85105758, and 85557026.
Key features
- Genuine GM / ACDelco OE fuel pump module
- Complete in-tank assembly with pump, sender, and strainer
- Restores factory diesel supply pressure to the high-pressure pump
- Fuel sending unit included for correct gauge operation
- Gasket / seal included
- Direct-fit replacement for the listed crew-cab short-box trucks
- Current GM supersession for earlier L5P module numbers
Fitment
- 2020–2025 Chevrolet Silverado 2500HD 6.6L Duramax L5P
- 2020–2025 Chevrolet Silverado 3500HD 6.6L Duramax L5P
- 2020–2025 GMC Sierra 2500HD 6.6L Duramax L5P
- 2020–2025 GMC Sierra 3500HD 6.6L Duramax L5P
- Crew cab, short box (6 ft 6 in / 6.9 ft bed)
- 3500HD single-tank applications
Does not fit 2017–2019 L5P trucks, gas engines, long-box models, dual-tank setups, or cab-and-chassis tanks. Confirm cab, bed length, and tank count before ordering.
What’s in the box
- GM fuel tank pump module assembly
- Fuel sending unit
- Strainer
- Tank gasket / seal
Lock ring, mounting hardware, and wiring harness are not included. The lock ring is reused only if it is in good condition; GM notes the related seal cannot be reused.
Notes & specs
- Brand/part number: GM 86534329
- Also listed as: ACDelco 86534329
- Type: in-tank electric fuel pump module
- Fuel: diesel
- Voltage: 12V
- Outlet: quick-connect, 0.37 in
- Sender range: 40 ohm full / 250 ohm empty
- Lock ring included: no
- Gasket included: yes
- Strainer included: yes
- Supersedes: 84777079, 85105758, 85557026
Relieve fuel-system pressure, support the tank, and replace the lock-ring seal during install. After start-up, check for leaks and confirm the gauge sweeps correctly. If a 2020–2025 L5P crew-cab short-box truck is starving the CP4 or reading fuel level wrong, GM 86534329 is the OEM in-tank pump module for that tank.
L5P Duramax Fuel Tank Pump Module Kit | GM 86534329
Replace a weak or failed L5P in-tank lift pump with the genuine GM module. GM 86534329 is the current OEM fuel tank / fuel pump module kit for 2020–2025 Silverado and Sierra HD trucks with the 6.6L Duramax. It sits in the tank, feeds the high-pressure pump, and includes the fuel-level sender. A failing module can cause hard start, no-start, low supply pressure, a noisy tank, or a fuel gauge that reads wrong. This kit supersedes 84777079, 85105758, and 85557026.
Key features
Genuine GM / ACDelco OE fuel pump module
Complete in-tank assembly with pump, sender, and strainer
Restores factory diesel supply pressure to the high-pressure pump
Fuel sending unit included for correct gauge operation
Gasket / seal included
Direct-fit replacement for the listed crew-cab short-box trucks
Current GM supersession for earlier L5P module numbers
Fitment
2020–2025 Chevrolet Silverado 2500HD 6.6L Duramax L5P
2020–2025 Chevrolet Silverado 3500HD 6.6L Duramax L5P
2020–2025 GMC Sierra 2500HD 6.6L Duramax L5P
2020–2025[...]
L5P Duramax Fuel Tank Pump Module Kit | GM 86534329
Replace a weak or failed L5P in-tank lift pump with the genuine GM module. GM 86534329 is the current OEM fuel tank / fuel pump module kit for 2020–2025 Silverado and Sierra HD trucks with the 6.6L Duramax. It sits in the tank, feeds the high-pressure pump, and includes the fuel-level sender. A failing module can cause hard start, no-start, low supply pressure, a noisy tank, or a fuel gauge that reads wrong. This kit supersedes 84777079, 85105758, and 85557026.
Key features
- Genuine GM / ACDelco OE fuel pump module
- Complete in-tank assembly with pump, sender, and strainer
- Restores factory diesel supply pressure to the high-pressure pump
- Fuel sending unit included for correct gauge operation
- Gasket / seal included
- Direct-fit replacement for the listed crew-cab short-box trucks
- Current GM supersession for earlier L5P module numbers
Fitment
- 2020–2025 Chevrolet Silverado 2500HD 6.6L Duramax L5P
- 2020–2025 Chevrolet Silverado 3500HD 6.6L Duramax L5P
- 2020–2025 GMC Sierra 2500HD 6.6L Duramax L5P
- 2020–2025 GMC Sierra 3500HD 6.6L Duramax L5P
- Crew cab, short box (6 ft 6 in / 6.9 ft bed)
- 3500HD single-tank applications
Does not fit 2017–2019 L5P trucks, gas engines, long-box models, dual-tank setups, or cab-and-chassis tanks. Confirm cab, bed length, and tank count before ordering.
What’s in the box
- GM fuel tank pump module assembly
- Fuel sending unit
- Strainer
- Tank gasket / seal
Lock ring, mounting hardware, and wiring harness are not included. The lock ring is reused only if it is in good condition; GM notes the related seal cannot be reused.
Notes & specs
- Brand/part number: GM 86534329
- Also listed as: ACDelco 86534329
- Type: in-tank electric fuel pump module
- Fuel: diesel
- Voltage: 12V
- Outlet: quick-connect, 0.37 in
- Sender range: 40 ohm full / 250 ohm empty
- Lock ring included: no
- Gasket included: yes
- Strainer included: yes
- Supersedes: 84777079, 85105758, 85557026
Relieve fuel-system pressure, support the tank, and replace the lock-ring seal during install. After start-up, check for leaks and confirm the gauge sweeps correctly. If a 2020–2025 L5P crew-cab short-box truck is starving the CP4 or reading fuel level wrong, GM 86534329 is the OEM in-tank pump module for that tank.