This is a mechanical fuel pump. With this design, the fuel pump was driven mechanically off the engine.
Problems cropped up when the diaphragm tore and raw gasoline fed into the crankcase, diluting the oil and
causing lower end problems. The other problem with this design was the mechanical arm, which after long
mechanical service broke or bent, resulting in engine shutdown from loss of fuel.
TBI injection: When computers started coming on the scene in the early
1980s, carmakers decided to modify the fuel delivery systems, along with the
ignition systems. First, they tried electronic feedback carburetors, but they still
had to deal with the pitfalls of carburetors (despite the fact that they were
electronically controlled). In addition, they still had manifolds, which diminished
effective fuel delivery. These were the forerunners of a primitive fuel injection
system called TBI (throttle body injection). TBI took the place of a carburetor.
Still sitting atop a manifold (but now called a plenum), TBI consisted of a single
fuel injector that delivered fuel to the engine based on electronic commands
from the engine control module.
Multi-port fuel injection: As technology raced forward so did fuel systems,
with the emergence of multi-port fuel injection. Engineers decided to eliminate
the plenum and deliver the fuel directly into each cylinder via the cylinder head.