Electric Fuel Pumps for universal applications

These pumps are a tried and tested solution for many applications:

• as a replacement for mechanical fuel pumps where the original pump is no longer available (old/young-timers)
• as a fuel pre-pump for diesel engines or petrol engines
• as a temporary solution for repairs where a special replacement is not available
• as an additional pump which is additionally switched on depending on demand (failure of the main fuelpump)
• as a refilling or supply pump in refilling systems, additional tanks or heating systems
• as an additional pump for tuning and racing applications

In the case of today’s modern designs of electric fuel pumps, the pumping stage is seated directly on the shaft of the electric motor. The fuel passes through the fuel pump thereby simultaneously cooling and “lubricating” it.

Advantages:

• Fewer moving parts
• Compact design
• Small outside dimensions

Depending on the way in which the fuel pump is accommodated in the vehicle, a difference is made between in-tank and in-line pumps. For the pumping stage there exist different designs. A rough differentiation is made between flow pumps and positive displacement pumps.

In positive displacement pumps, the fuel is pumped through sealed-off volumes. Such pumps are used in the case of higher system pressures (up to approximately 6.5 bar) that are found in conventional injection systems, for example. Except for design related leaks, the fuel cannot flow through the positive displacement pump in the reverse direction even when the pump is at standstill. Toothed ring pumps, sliding vane pumps, roller vane pumps and screw pumps belong to the category of positive displacement pumps. Positive displacement pumps are self-priming to a very limited extent, i.e. they should be mounted below the liquid level of the fuel tank (maximum suction height 500 mm).