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Fuelling and Emissions

A quick reference guide to each component in the Lucas Fuelling and Emissions range and what operation they perform.

Lucas Engine Management
Occupation Road
Hucknall
Nottingham
NG15 6DZ
England

Tel: + 44 (0) 1623 886400
Email: sales@smpeurope.com

In-tank Fuel Pump Assembly

The in-tank pump assembly is, as the name suggests, fitted inside the fuel tank. This part consists of a pump, swirl pot, fuel level sender and a mounting bracket. Caution is advised when changing or doing any repairs to this part as the injection pump works at approx 4bar to 6bar pressure on Mpi systems and approx 1bar on Spi systems. This unit is usually fitted in from the top of the tank; access to the pump assembly may be gained from a removable panel in the floor of the vehicle. Alternatively on some makes the tank may have to be removed to gain access.

The main reason for failure of this unit is debris getting into the pump when fuel runs low, or, repetitively trying to start the vehicle, when the vehicle has run out of fuel.

In-tank Fuel Pump

The in-tank fuel pump may be part of the complete assembly or could be a unit on its own, refer to in-tank pump assembly for further information.

In-tank Fuel Pump Pre-supply

This unit is located in the fuel tank; in the same way as the fuel pump assembly. Its function is to deliver a high volume of fuel at a low pressure, approx 0.5bar, to a high–pressure injection pump or carburettor. The location of the injection pump can either be in the same tank or an external in-line high-pressure injection pump mounted near the main fuel tank.

Reasons for failure of this unit are debris getting in to the pump when fuel level runs low, or, repetitively trying to start the vehicle, when the vehicle has run out of fuel.

External Fuel Pump

This unit is located outside the fuel tank near its base and is generally gravity fed with fuel from an outlet in the base of the fuel tank.

Two of the main reasons for failure of this unit are debris from the bottom of the tank getting in to the pump when fuel level runs low, or, repetitively trying to start the vehicle when the vehicle has run out of fuel. Symptoms of these types of failure are lack of fuel pressure or noisy pump motors.

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