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L5P Duramax Fuel Tank Fuel Pump Module Kit | GM 86534333
Replace a weak 2020–2026 L5P in-tank lift pump with the genuine GM long-box module. GM 86534333 is the OEM fuel tank / fuel pump module kit for Silverado and Sierra HD trucks with the 6.6L Duramax and an 8 ft box. 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 number supersedes 84777083, 85105755, and 85557023.
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 listed 2020–2026 long-box L5P trucks
- Current GM supersession for earlier long-box module numbers
Fitment
- 2020–2026 Chevrolet Silverado 2500HD 6.6L Duramax L5P
- 2020–2026 Chevrolet Silverado 3500HD 6.6L Duramax L5P
- 2020–2026 GMC Sierra 2500HD 6.6L Duramax L5P
- 2020–2026 GMC Sierra 3500HD 6.6L Duramax L5P
- Crew cab and double cab
- Long box (8 ft bed)
- 3500HD single-tank applications
Does not fit 2017–2019 L5P trucks, short-box / 6.5 ft models, gas engines, dual-tank setups, or cab-and-chassis tanks. 2020–2026 short-box trucks use GM 86534329. 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. Reuse the lock ring only if it is in good condition.
Notes & specs
- Brand/part number: GM 86534333
- Also listed as: ACDelco 86534333, 85557023
- Type: in-tank electric fuel pump module
- Fuel: diesel
- Voltage: 12V
- Outlet: quick-connect
- Lock ring included: no
- Gasket included: yes
- Strainer included: yes
- Supersedes: 84777083, 85105755, 85557023
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 2020–2026 L5P long-box truck is starving the injection pump or reading fuel level wrong, GM 86534333 is the OEM in-tank pump module for that tank.
L5P Duramax Fuel Tank Fuel Pump Module Kit | GM 86534333
Replace a weak 2020–2026 L5P in-tank lift pump with the genuine GM long-box module. GM 86534333 is the OEM fuel tank / fuel pump module kit for Silverado and Sierra HD trucks with the 6.6L Duramax and an 8 ft box. 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 number supersedes 84777083, 85105755, and 85557023.
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 listed 2020–2026 long-box L5P trucks
Current GM supersession for earlier long-box module numbers
Fitment
2020–2026 Chevrolet Silverado 2500HD 6.6L Duramax L5P
2020–2026 Chevrolet Silverado 3500HD 6.6L Duramax L5P
2020–2026 GMC Sierra 2500HD 6.6L Duramax L[...]
L5P Duramax Fuel Tank Fuel Pump Module Kit | GM 86534333
Replace a weak 2020–2026 L5P in-tank lift pump with the genuine GM long-box module. GM 86534333 is the OEM fuel tank / fuel pump module kit for Silverado and Sierra HD trucks with the 6.6L Duramax and an 8 ft box. 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 number supersedes 84777083, 85105755, and 85557023.
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 listed 2020–2026 long-box L5P trucks
- Current GM supersession for earlier long-box module numbers
Fitment
- 2020–2026 Chevrolet Silverado 2500HD 6.6L Duramax L5P
- 2020–2026 Chevrolet Silverado 3500HD 6.6L Duramax L5P
- 2020–2026 GMC Sierra 2500HD 6.6L Duramax L5P
- 2020–2026 GMC Sierra 3500HD 6.6L Duramax L5P
- Crew cab and double cab
- Long box (8 ft bed)
- 3500HD single-tank applications
Does not fit 2017–2019 L5P trucks, short-box / 6.5 ft models, gas engines, dual-tank setups, or cab-and-chassis tanks. 2020–2026 short-box trucks use GM 86534329. 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. Reuse the lock ring only if it is in good condition.
Notes & specs
- Brand/part number: GM 86534333
- Also listed as: ACDelco 86534333, 85557023
- Type: in-tank electric fuel pump module
- Fuel: diesel
- Voltage: 12V
- Outlet: quick-connect
- Lock ring included: no
- Gasket included: yes
- Strainer included: yes
- Supersedes: 84777083, 85105755, 85557023
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 2020–2026 L5P long-box truck is starving the injection pump or reading fuel level wrong, GM 86534333 is the OEM in-tank pump module for that tank.