Mechanical Fuel Pump M4566 for Pontiac GTO Tempest Chieftain Bonneville Catalina Grand Prix LeMans Ventura 1958-1965
This fuel pump is engineered as a direct replacement for the Pontiac GTO Tempest Chieftain Bonneville Catalina Grand Prix LeMans Ventura 1958-1965. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.
Vehicle Compatibility
| Application | Details |
|---|---|
| Mechanical Fuel Pump M4566 for Pontiac GTO Tempest Chieftain Bonneville Catalina Grand Prix LeMans Ventura 1958 | 1965 Replacement Part Number: M4566, MF0143, SP1152MP Applications: Fit for Pontiac Vehicle: 1964-1965 GTO (Liter: 6.4 & Engine(ci): 389 & Cylinder: 8 & Block: V)1963-1965 Tempest (Liter: 5.3 & Engine(ci): 326 & Cylinder: 8 & Block: V , Qualifier: Except High Lift Camshaft)1958 Chieftain (Liter: 6.1 & Engine(ci): 370 & Cylinder: 8 & Block: V)1958-1964 Star Chief (Liter: 6.1, 6.4, 6.9 & Engine(ci): 370, 389, 421 & Cylinder: 8 & Block: V , Qualifier: Except High Lift Camshaft)1958 Super Chief (Liter: 6.1 & Engine(ci): 370 & Cylinder: 8 & Block: V)1958-1964 Bonneville (Liter: 6.1, 6.4, 6.9 & Engine(ci): 370, 389, 421 & Cylinder: 8 & Block: V , Qualifier: Except High Lift Camshaft)1958-1965 Catalina (Liter: 6.1, 6.4, 6.9 & Engine(ci): 370, 389, 421 & Cylinder: 8 & Block: V , Qualifier: Except High Lift Camshaft)1962-1965 Grand Prix (Liter: 6.4, 6.9 & Engine(ci): 389, 421 & Cylinder: 8 & Block: V , Qualifier: Except High Lift Camshaft, Except Super Duty)1963-1965 LeMans (Liter: 5.3 & Engine(ci): 326 & Cylinder: 8 & Block: V , Qualifier: Except High Lift Camshaft)1960-1961 Ventura (Liter: 6.4 & Engine(ci): 389 & Cylinder: 8 & Block: V) |
Replaces OEM Part Numbers
M4566 • MF0143 • SP1152MP • 1958-1965 • 1964-1965 • 1963-1965 • 1958-1964
Signs You Need a Replacement
If your equipment is showing any of these symptoms, the fuel pump may be the cause:
- Engine cranks but won’t start — The pump may have lost prime or stopped delivering fuel. Check for fuel at the filter outlet before replacing the pump.
- Stalling under load — A weak pump can’t maintain pressure at high demand. The engine runs fine at idle but dies when you put it to work.
- Fuel pressure warning (if equipped) — Modern equipment monitors fuel rail pressure. A low-pressure warning often means the pump is failing.
- Loud whining from fuel system — A failing pump makes a high-pitched whine that gets louder as it warms up. Normal pump noise is a low hum.
- Air in fuel lines — If you see bubbles in the transparent fuel line or the primer bulb won’t stay firm, the pump may be drawing air through a worn seal.
- Excessive return flow — Too much fuel returning to the tank instead of reaching the injectors indicates internal pump wear.
Before You Replace the Pump
Before replacing the pump, check the fuel filter and fuel lines for restrictions. A blocked filter causes the same symptoms as a failing pump on equipment. When installing the new pump, fill it with clean fuel before connecting the lines — this reduces priming time and prevents dry-run damage. After installation, bleed the system fully and check for leaks at all connection points. Replace the fuel filter at the same time as the pump to protect the new unit from debris.
Frequently Asked Questions
Can I cross-reference M4566 with MF0143?
Yes. Both M4566 and MF0143 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.
My vehicle is a 1958 model – is it covered?
The compatibility range for this part includes 1958-1965. The 1958 model year falls within this range, but verify the engine code and body type match. Mid-year production changes sometimes mean two vehicles from the same model year use different parts.
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