Single and Dual Type Electric Fuel Pumps

Single and Dual Type Electric Fuel Pumps

L and HP Type Pumps

The type L and HP pumps are the predecessors of the other single pump designs. The type L is a suction pump intended to be mounted close to the engine, whereas the HP type is designed to be mounted near the fuel tank at the rear of the vehicle.

AUF 200/AZX 1200

The versatile AUF 200/AZX 1200 is the smaller of the current range of SU electric fuel pumps. A compact unit of high pressure design, it incorporates inlet and outlet connections adjustable through 210° to facilitate installation. A venting system allows the pump to be fully sealed.

Normally produced in 12-volt form, it is also available in 6-volt and 24-volt versions and a low pressure version is also produced.

The size and capacity of this pump makes it eminently suitable for use on vehicles in the low and middle power range.

Special features:

1) Freedom of installation:
Compact dimensions
Self-contained unit
Adjustable connections
2) Rapid priming of float-chamber
3) Excellent vapour handling capacity
4) Twin tungsten contact breaker points

AUF 300/AZX 1300

The AUF 300/AZX 1300 series pump is a high capacity adaptation of the AUF 200/1200, the pump body having been redesigned to incorporate a flow-smoothing unit and an air bottle.

The flow-smoothing unit consists of a diaphragm and housing situated above the delivery chamber and outlet passage. Fuel pressure pulsations are damped by the air contained in the housing, resulting in a reduction of flow pressure variations and an increase in output for a given rate of operation.

A large compartment formed in the inlet side of the pump acts as an air cushion and smoothes the pressure pulsations of the incoming fuel; it also prevents high negative pressure being created in the pump body.

Special features:

The features are similar to those of the AUF 200/AZX 1200 type, plus:

6) High output
7) Flow-smoothing on inlet and outlet

AUF 400/AZX 1400

The extra high capacity AUF 400/AZX 1400 is basically a dual version of the AUF 300/AZX 1300 pump and has a delivery capability of up to 136 litres per hour (30 gallons per hour).

The pump consists of two coil and diaphragm assemblies mounted opposite each other on a common body casting. Separate pumping chambers, with inlet and outlet valves in each, are fed from a common inlet port and fuel is discharged through a common outlet.

The flow-smoothing features of the type AUF 300/AZX 1300 are incorporated in this pump, which has been designed for high pressure applications where the majority of the work is required on the outlet side of the pump.

The standard unit is for use on 12-volt electrical systems but 24-volt versions are also available.

Special features:

1) Freedom of installation:
Compact dimensions
Self-contained unit
Venting system available
2) Extra high output
3) Rapid priming of float-chamber
4) Excellent vapour handling capacity
5) Twin tungsten contact breaker points with spark suppression

AUF 500/AZX 1500

The AUF 5001 AZX 1500 dual pump is similar in construction to the AUF 400/AZX 1400, but is designed to operate as two separate units for those systems having two fuel tanks, or a main and reserve supply. Two inlet ports on the pump body are for connection to the two fuel tanks. Both sides of the pump discharge into the single outlet provided.

Terminals are provided on each coil assembly for separate connection to the power supply through controls which would normally include a change-over switching arrangement.

Special features:

1) Freedom of installation:
Compact dimensions
Self-contained unit
Venting system available
2) Rapid priming of float-chamber
3) Excellent vapour handling capacity
4) Twin tungsten contact breaker points with spark suppression
5) Dual inlet connections
6) Common outlet connection