21638691 Fuel Regulator | Genuine Volvo Penta Part

🔧 Product Description

A genuine fuel regulator used in the low-pressure fuel system on Volvo Penta TAD550GE generator engines. It maintains the specified fuel pressure and return flow so the injection system receives a stable supply under changing load.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD560VE
• Volvo Penta TAD561VE
• Volvo Penta TAD650VE
• Volvo Penta TAD660VE
• Volvo Penta TAD734GE
• Volvo Penta TAD750GE
• Volvo Penta TAD751GE
• Volvo Penta TAD750VE
• Volvo Penta TAD752GE
• Volvo Penta TAD753GE
• Volvo Penta TAD754GE
• Volvo Penta TAD760VE
• Volvo Penta TAD765VE
• Volvo Penta TAD764VE
• Volvo Penta TAD763VE
• Volvo Penta TAD762VE
• Volvo Penta TAD761VE

• Engine Family: TAD
• Year Range: Approximately 2010 - 2020
• Serial Range: SN5311038330-

⚙️ Key Features

• Genuine Volvo Penta fuel-pressure regulator
• Specified for TAD550GE fuel systems
• Calibrated pressure and return-flow control
• Used with the associated overflow and solenoid valves
• Direct replacement for a sticking or leaking original regulator
• Engine type: 5.1L inline four-cylinder turbocharged generator diesel
• Quantity varies by assembly, most commonly one
• Also supersedes Volvo part numbers 20794130, 20993071 and 21060258

🔌 Function

Controls low-pressure fuel-system pressure and return flow so the injection equipment receives a consistent fuel supply.

⚠️ Common Signs of Failure

• Low fuel pressure and reduced power
• Unstable idle or load response
• Excess return flow or fuel leakage
• Fuel-pressure diagnostic faults

🛠️ Service Notes

• The regulator is a built-up assembly — overflow valve, O-rings, gasket and a six-point socket screw — so renew these seals as a set rather than reusing them if the housing is ever opened
• The same base regulator (VOE21103266 lineage) also turns up on Volvo industrial diesels outside the marine generator range, so check the number stamped on the part against your TAD550GE's own parts list rather than assuming by application alone

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21638691 → Supersedes 21103266

OEM / Related Numbers

• 21670181 - overflow valve
• 21856211 - O-rings
• 21670186 - O-rings
• 21670190 - O-rings
• 969011 - gasket
• 21738265 - mounting screw
• 21738263 - solenoid valve

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging