3858966 Volvo Fuel Pipe | Genuine Used Part

🔧 Product Description

Genuine Volvo Penta 5.0L / 5.7L MPI Fuel Rail - Part Number: 3858966

A genuine used Volvo Penta fuel pipe or injector rail for selected GM-based 5.0L and 5.7L multipoint-injected petrol marine engines.

The rail supplies regulated fuel pressure to the engine's eight injectors and incorporates mounting positions for the fuel-pressure regulator, valve, cap and related hose connection.

⚙️ Key Features

• Genuine Volvo Penta V8 fuel rail
• Correct Volvo reference 3858966
• Supports eight fuel injectors
• Used with regulator 3858967 and clip 3858968
• Suits selected 5.0L and 5.7L EFI, Gi, GXi and OSi engines

🚤 Compatibility

Commonly used on

• Volvo Penta GM V8 multipoint fuel-injection systems
• Eight-injector 5.0L and 5.7L petrol engines
• Gi, GXi, OSi and EFI engine families

Typically suits

• Engine models:
• Volvo Penta 5.0GiC-225-S
• Volvo Penta 5.0GiC-J
• Volvo Penta 5.0GiCE-225-S
• Volvo Penta 5.0GXi-B
• Volvo Penta 5.0GXi-BF
• Volvo Penta 5.0GXi-C
• Volvo Penta 5.0GXi-CF
• Volvo Penta 5.0GXi-D
• Volvo Penta 5.0GXi-E and EF
• Volvo Penta 5.0OSi-E and EF
• Volvo Penta 5.7Gi and GXi applications using rail 3858966
• Volvo Penta 5.7OSi-GF
• Volvo Penta V8-270-CE-A
• HP Range: Approximately 225HP - 320HP
• Engine Type: GM 5.0L and 5.7L V8 multipoint-injected petrol marine engine
• Year Range: Primarily late-1990s through mid-2000s

🔌 Function

The fuel rail stores and distributes regulated pressurised petrol equally to all eight injectors.

⚠️ Common Signs of Failure

• Petrol leaks around an injector seat
• Fuel-pressure regulator will not seal
• Rail is internally corroded or contaminated
• Engine runs lean under load
• Fuel pressure falls during acceleration
• Strong petrol smell in the engine compartment
• Injector retainers no longer fit securely
• Rail mounting tabs are cracked

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3858966 Volvo Penta V8 fuel-pipe reference

OEM / Related Numbers

• 3858966
• MerCruiser related fuel rail: 8M0070997
• Fuel-pressure regulator: 3858967
• Pressure-regulator clip: 3858968
• Fuel valve: 3858971
• Cap: 3858972
• Regulator hose: 3858974
• Injector: 3858969
• Later injector: 21141691
• Injector O-ring kit: 3858981
• Injector retainer: 3858970
• Fuel-rail bolt: 3858973

Aftermarket / Verified Equivalents

• MerCruiser / GM MPI fuel rail reference 8M0070997 where the complete intake specification matches
• Complete aftermarket 5.0L / 5.7L MPI intake assemblies incorporating replacement rail 3858966 / 8M0070997
• No verified standalone aftermarket rail with a separate manufacturer number

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated