FIAT 124 Spider
Engine Maintenance + Modification
46
Component Description
Auxiliary Air Regulator
P/N 0 280 140 120 or 0 280 141 013 (Spider with A/C)
This device allows air to be drawn directly into the plenum, bypassing the
throttle plate. The effect is an increase in idle speed – the computer will give
the engine more fuel to create an appropriate ratio to the inbound air. Once
engine temperatures reach the normal operating range the auxiliary air valve
closes.
Fuel Pressure Regulator
P/N 0 280 160 214
The fuel pressure regulator receives fuel from the fuel pump and keeps the fuel
pressure into the injectors constant. It is located on the fuel rail and connects
(via the rail) to the injectors and fuel pump. A smaller vacuum hose connects
this regulator to the intake manifold. It maintains a constant flow rate at the
injector tip as manifold pressure varies; increasing fuel pressure when manifold
is near ambient and dropping it as the manifold vacuum increases.
Failure of this device can cause fuel starvation or too much fuel in the system,
affecting performance.
Fuel Pump
P/N 0 580 464 019
Located under the car and near the fuel tank, the fuel pump delivers fuel through
the fuel filter and the fuel rail and into the injectors.
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