The electrical HARDI Fuel Pump is a diaphragm pump. Opposed to mechanical fuel pumps it has its own propulsion (an electric motor or a solenoid coil), which ensures a smooth functioning independent of the engine.

Solenoid Fuel Pumps have been used on a variety of vehicles since the early 1950’s.
To those of us who can remember the continuous rattle of the SU fuel pump signified impending doom as the engine on your mini van spluttered to a halt usually miles and miles from the nearest filling station.
Upon return to your stranded and depressed vehicle, the life giving fuel is administered and the continuous clicking returns to the immensely satisfying occasional click, click, as the pump brings the vehicle back to life and once more you are able to continue on your travels with a degree of elation hard to equal!!! The good old days are long gone but not so the solenoid fuel pump, it survives in excellent form and is manufactured by the German company “Hardi” complete with all the inherent reliability of German engineering.
The pump embodies a metal body making it compatible with the safety requirements of the Boat safety Scheme which calls for pumps of this type to be metal bodied.
The pump is designed to shut off when confronted with a suitable back pressure which is normally what most float chamber needle valves can generate and so the pump gently clicks away until the float chamber is full and then shuts down at the design back pressure.(See Techs below.)
Hardi 14412 pumps can reliably deliver up to 108 lts (24gallons) per hour and so are suitable for wide range of vehicles and differing applications.

Description
Used to supply fuel from a fuel tank to a carburetor or oil control valve on a Marine Bubble Oil Fired Stove.
Can deliver fuel within the range of Zero to 20 Gallons per hour.
For pumping unleaded petrol, diesel and fuels containing Methanol and Bio Ethanol.
Pump capacity automatically adjusts to consumption rate.
Easy to install (assembly instructions are enclosed)
Protected against corrosion, noise suppressed and maintenance-free.
Metal Bodied and complies with the current requirements of the UK Boat Safety Scheme.
Very reliable and long lived product.
Also suitable for vaporizing diesel stoves and boilers up to 20kW output.

Technical Information is supplied with each pump, here is a summary:-
Voltage (V):12VDC
Power: 1.5-1.9A
Connection (mm): 8 mm diameter via 8mm bore rubber tubing to ISO7840 A1 WP 10 BAR.
Capacity: 80-100l/h
Temperature range (°C): -40 +80
Pressure (bar):0.18-0.26
Pressure (psi): 2.6 – 3.77
Pumping height max. (m): 1.5
Manufacturer Part Number: 14412

All HARDI-Pumps have a special control system that enables the adaption of the pumping capacity to the consumption of the engine. This means, it will pump fast at high consumption, slow or not at all at low consumption and therefore a great deal of energy is saved (flexible stroke frequency).