Ford Escort Manual

General information and precautions
Carburettor fuel system / General information and precautions


The fuel system on all models with carburettor induction is composed of a centrally mounted fuel tank, a fuel pump, a carburettor and an air cleaner.

The fuel tank is mounted under the floor pan beneath the rear seats. The tank is ventilated, has a simple filler pipe and a fuel gauge sender unit.

The fuel pump is a mechanical diaphragm type actuated by means of a pushrod bearing on an eccentric cam on the camshaft. The pump is a sealed unit and cannot be dismantled.

The carburettor may be either a Ford variable venturi (VV) type or one of four versions of the Weber 2V type, depending on model.

The air cleaner has a thermostatically or waxstat-controlled air inlet, supplying either hot air from the exhaust manifold heat box or cold air from the front of the engine compartment. On the thermostaticallycontrolled type, a flap valve within the air cleaner unit regulates the air inlet temperature according to operating conditions in conjunction with a vacuum diaphragm unit and a heat sensor unit. On the waxstat air cleaner, being progressively introduced from 1986 onwards the air cleaner operates in the same way as the thermostatically-controlled type, but the flap valve is controlled by a wax capsule. The capsule is mounted in the inlet spout and operates the flap valve by expansion and contraction of the wax which varies according to temperature.

Warning: Many of the procedures in this Chapter entail the removal of fuel pipes and connections which may result in some fuel spillage. Before carrying out any operation on the fuel system refer to the precautions given in Safety First! at the beginning of this manual and follow them implicitly.

Petrol is a highly dangerous and volatile liquid and the precautions necessary when handling it cannot be overstressed


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