Fuel Pump, 1979-81 Buick 4.3L/4.9L, Pontiac 5.7L, 2-Line Pump

1979–81 Buick 4.3L/4.9L & Pontiac 5.7L Mechanical Fuel Pump (Two-Line)

Original-style diaphragm fuel pump with model-specific inlet and outlet connection arrangement.

This mechanical fuel pump serves the original carbureted fuel system on 1979–81 Buick 4.3L/4.9L & Pontiac 5.7L. The pump mounts at the engine’s mechanical fuel-pump location and uses a diaphragm actuated by the engine to draw fuel from the tank and deliver it toward the carburetor. Its two-line fuel-line arrangement and port orientation must match the existing engine plumbing; two-line and three-line pumps are not interchangeable solely by engine displacement. The original-style mounting flange is intended for the specified block and fuel-pump drive. Compare the original pump connections, A/C configuration where applicable, and engine year before installation.

• 1979–81 Buick 4.3L/4.9L & Pontiac 5.7L • Engine-operated diaphragm fuel pump • Two-Line fuel connection layout • Original-style pump flange location • Check fuel-line direction and fittings • For carbureted fuel-delivery systems