Carter M4685 Mechanical Fuel Pump
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Carter

Carter M4685 Mechanical Fuel Pump

Brand Carter M4685
Gasket Or Seal Included Yes
Inlet Outside Diameter 9.5
Inlet Quantity 1
Inlet Type Threaded
Maximum Pressure 7
Minimum Flow Rating 40
Minimum Pressure 5.5
Mounting Hardware Included No
Mounting Hole Quantity 2
Outlet Fitting Thread Size 5/8-18 UNF-2B
Outlet Quantity 1
Outlet Type Threaded
Pump Type Mechanical
Fits Buick, Chevrolet, Pontiac, GMC, Oldsmobile, and Checker · 114 vehicles

OE fit, form, and function. Premium replacement engineered for dependable fuel delivery.

Threaded inlet and outlet. Simplifies connection for a secure, leak-resistant install.

Gasket or seal included. Helps support a cleaner, more complete installation.

Cross-references Airtex Fuel Pumps 40725, Delphi MF0049 and GMB 530-8040 for the same application. See all 16.

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Carter M4685 Mechanical Fuel Pump

The Carter M4685 is a mechanical fuel pump built for OE-style fit, form, and function in a wide range of classic GM applications. It uses threaded inlet and outlet connections, a 2-hole mounting pattern, and a gasket or seal is included for service replacement work.

With a minimum flow rating of 40 and operating pressure range of 5.5 to 7, this Carter fuel pump supports proper fuel delivery for carbureted systems that rely on a mechanical pump. It is a direct-fit option for many Chevrolet, Buick, Oldsmobile, and Pontiac vehicles, including applications such as the Chevrolet Impala, Camaro, El Camino, and Pontiac Grand Prix.

Key Features

  • Mechanical fuel pump for air and fuel delivery service
  • Threaded inlet and threaded outlet for secure line connection
  • 1 inlet and 1 outlet configuration
  • Outlet fitting thread size: 5/8-18 UNF-2B
  • Inlet outside diameter: 9.5
  • Minimum flow rating: 40
  • Operating pressure range: 5.5 to 7
  • Gasket or seal included
  • 2 mounting holes for installation alignment
  • Mounting hardware not included

Detailed Description

Carter M4685 is a mechanical fuel pump for classic GM vehicles that use a 2 line pump setup. It is listed for a broad range of fitments across Buick Regal, Chevrolet Caprice, Chevrolet Impala, Chevrolet Monte Carlo, Chevrolet El Camino, Chevrolet Camaro, Pontiac Bonneville, Pontiac Grand Prix, Pontiac Parisienne, Oldsmobile Cutlass Supreme, and related models. This part cross-references Airtex Fuel Pumps 40725 for the same application.

As a threaded mechanical pump, the M4685 is suited to carbureted fuel systems where consistent fuel pressure and flow are required. The Carter fuel systems program emphasizes OE fit, form, and function along with broad vehicle coverage and problem-solving design details, making this part a practical replacement choice for service on older GM platforms.

What It Helps Solve

  • Hard starting caused by weak fuel delivery
  • Fuel starvation under normal driving conditions
  • Low fuel pressure in carbureted systems
  • Intermittent stalling related to pump wear
  • Replacement needs for leaking or failing mechanical pumps

Installation Notes and Tips

Verify that the vehicle uses a 2 line pump configuration before ordering. Some listed applications have notes for late production, external pump, or package-specific exclusions such as taxi or police packages. Confirm threaded line size, inlet orientation, and mounting-hole alignment before installation. Use the included gasket or seal and follow the vehicle service procedure for fuel line and mounting surface preparation.

Quality Assurance

Carter builds the M4685 with OE-style fit, form, and function for service replacement use. The part is engineered for the specified pressure and flow range and is backed by Carter’s fuel system product standards.

Related reading

This part fits 114 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
1987BuickRegal5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1987ChevroletCaprice5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1987ChevroletEl Camino5.0LV8—N/AExternal Pump
1987ChevroletMonte Carlo5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1987PontiacGrand Prix5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1986BuickRegal5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1986ChevroletCaprice5.0LV8—N/AExcept Taxi Package; with 2 Line Pump
1986ChevroletEl Camino5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1986ChevroletMonte Carlo5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1986OldsmobileCutlass Supreme5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1986PontiacBonneville5.0LV8—N/A1st Design, suitable for use with 2 Line Pump.
1986PontiacGrand Prix5.0LV8—N/A1st Design, suitable for use with 2 Line Pump.
1986PontiacGrand Prix5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1986PontiacParisienne5.0LV8—N/A1st Design, suitable for use with 2 Line Pump.
1986PontiacParisienne5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1985BuickRegal5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1985ChevroletCaprice5.0LV8—N/AExcept Taxi Package; with 2 Line Pump
1985ChevroletEl Camino5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1985ChevroletImpala5.0LV8—N/AExcept Taxi Package; with 2 Line Pump
1985ChevroletMonte Carlo5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1985OldsmobileCutlass Supreme5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1985PontiacBonneville5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1985PontiacGrand Prix5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1985PontiacParisienne5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1984BuickRegal5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1984ChevroletCaprice5.0LV8—N/AExcept Taxi Package; with 2 Line Pump
1984ChevroletEl Camino5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1984ChevroletImpala5.0LV8—N/AExcept Taxi Package; with 2 Line Pump
1984ChevroletMonte Carlo5.0LV8—N/Awith 2 Line Pump; Except Police/Taxi Packages
1984PontiacBonneville5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1984PontiacGrand Prix5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1984PontiacParisienne5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983ChevroletCaprice5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983ChevroletEl Camino5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983ChevroletImpala5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983ChevroletMalibu5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983ChevroletMonte Carlo5.0LV8—N/Awith 2 Line Pump; Except Police/Taxi Packages
1983OldsmobileCutlass Cruiser5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983PontiacBonneville5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983PontiacGrand Prix5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1983PontiacParisienne5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982BuickLeSabre4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982BuickRegal4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletCaprice4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletCaprice5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletEl Camino4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletEl Camino5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletImpala4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletImpala5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletMalibu4.4LV8—N/Awith 2 Line Pump; Except Police/Taxi Packages
1982ChevroletMalibu5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletMonte Carlo4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982ChevroletMonte Carlo5.0LV8—N/Awith 2 Line Pump; Except Police/Taxi Packages
1982OldsmobileCutlass Cruiser4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982OldsmobileCutlass Cruiser5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982OldsmobileCutlass Supreme4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982OldsmobileDelta 884.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982PontiacGrand LeMans4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1982PontiacGrand Prix4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981BuickCentury4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981BuickCentury5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981BuickRegal4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletBel Air4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletCamaro4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletCamaro5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletCamaro5.7LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletCaprice4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletCaprice5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletEl Camino4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletEl Camino5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletImpala4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletImpala5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletImpala5.7LV8GASN/AExcept Taxi Package; with 2 Line Pump
1981ChevroletMalibu4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletMalibu5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletMalibu5.7LV8—N/Awith 2 Line Pump; Except Police/Taxi Packages
1981ChevroletMonte Carlo4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981ChevroletMonte Carlo5.0LV8—N/Awith 2 Line Pump; Except Police/Taxi Packages
1981OldsmobileCutlass4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981OldsmobileDelta 884.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981PontiacFirebird4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981PontiacFirebird5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981PontiacGrand LeMans4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981PontiacGrand Prix4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1981PontiacLeMans4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1980PontiacGrand LeMans4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1979PontiacGrand LeMans4.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1973ChevroletImpala5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1972ChevroletCamaro5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1972ChevroletImpala5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1971ChevroletCamaro5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1971ChevroletImpala5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1969ChevroletC10 Suburban5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1969ChevroletCamaro5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1969ChevroletCamaro5.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1969ChevroletCamaro5.0LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletBel Air5.3LV8—N/ALate production vehicles with a 2 line pump.
1968ChevroletBel Air5.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletC10 Suburban5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletC10 Suburban5.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletCamaro5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletCamaro5.7LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletCamaro5.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletEl Camino5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletImpala5.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletImpala5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletK10 Suburban5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletK10 Suburban5.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletK20 Suburban5.4LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1968ChevroletK20 Suburban5.3LV8—N/ACompatible with vehicles equipped with a 2 Line Pump.
1967ChevroletBel Air5.3LV8—N/ALate production vehicles with a 2 line pump.
1967ChevroletCamaro5.3LV8—N/ALate production vehicles with a 2 line pump.
1967ChevroletCamaro5.7LV8—N/ALate production vehicles with a 2 line pump.
1967ChevroletImpala5.3LV8—N/ALate production vehicles with a 2 line pump.
Directly replaces or cross-references 16 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Airtex Fuel Pumps — 40725Delphi — MF0049GMB — 530-8040Spectra Premium — SP1009MP602-11146856116057223617429600292960227644103764420816470422A11132122TGB0173PM16050