Incorrect installation

When retrofitting an electric fuel pump, in particular, certain points must be noted, as otherwise problems may occur in the fuel system or the fuel pump may suffer damages.

• Type E1F and E3L pumps are in-line pumps. They may only be inserted in the fuel line. Maximum suction lift: 500 mm
• The E1S is an in-tank pump which may only be installed in the tank. Maximum suction lift: 0 mm
• All modern pumps are driven by electric motor. The fuel flows through the drive, so that it simultaneously acts as a coolant. A flow must be constantly available to ensure perfect function and cooling.
• The pumps are wired in such a way that they pump continually while receiving current. When there is little or no fuel delivery current consumption rises, but virtually no cooling takes place. The result is a build-up of gas in the pump, problems in the supply of fuel to the engine and, later on, wear of the pump. This can be avoided by using a fuel return, for example.
• Install fuel pumps in a location where they are protected from dirt and splash water.
• In the case of type E1F electric fuel pumps, a sieve filter must be inserted in the fuel line before the pump on the intake side, to prevent damage through contamination. This filter must have a sufficiently large filter surface (depending on the application), and a mesh size of 60-100µm (microns). Paper filters are unsuitable, because the mesh size is too small.

Attention:
The sieve filter in the intake manifold connection must be removed for use in diesel engines.
 

• For type E1F fuel pumps, PIERBURG offers the 4.00030.80.0 fuel sieve filter – a filter that reliably protects the fuel pump from dirt and other foreign particles, preventing premature failure. The sieve filter should be replaced at the same maintenance intervals as the fuel filter.
• Choose the installation location in such a way as to ensure that the fuel pump is not subjected to excessive load due to heat (near the engine or exhaust) and vibration (rigid lines, installation under tension).

• When retrofitting an electric fuel pump, §46 of the StVZO (German Road Traffic Licensing Regulations) requires the installation of a safety shut-off.
• Dry running very quickly leads to damages in the pump system. To prevent this, the pump must be installed low (“wet”, below the fluid level) in the vicinity of the tank. At the same time, constrictions (“bottlenecks”) on the intake side must be avoided. If this is not possible, an E1S side-channel pump should be inserted in the tank as a pre-feeder pump.
• Only use fuel-resistant materials for components that are exposed to fuel (e.g. rubber seals).
• During assembly, take care to avoid material combinations that would provoke contact corrosion. The pump housing (aluminium) should not come into contact with galvanised surfaces, for example.
• Noise can occur due to resonance, depending on where a retrofitted fuel pump is installed. This can make it sound as though the fuel pump is faulty.
• Fuel lines that are routed under tension can also be the reason for excessive noise.

Note: As long as the ignition is on, the pump delivers fuel. In order to prevent the carburettor from overflowing or fuel escaping from torn off lines when the engine comes to a stop with the ignition on (stalled engine, accident), the installation of a safety shut-off 4.05288.50.0 (see Service Information SI 0016/A) is absolutely essential. The safety shut-off stops the fuel pump “on engine OFF”.