Retrofitting an electric fuel pump
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Information on diagnostics
A few points must be taken into account when converting or retrofitting electrical diesel or petrol pumps to combustion engines. Excessive propagation of the heat in the vehicle's engine compartment should be avoided. The pump capacity plays an important role for the cooling circuit and therefore for the temperature of the pump – but what happens if the pump capacity is interrupted but the power supply is not? What should be taken into account for certain material combinations to avoid corrosion? You can find information on this and which settings on the pump can lead to higher noise levels in this article.
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 60-100 μm (microns). Paper filters are unsuitable, because the mesh size is too small.
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Attention: The sieve filter in the intakemanifold 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 (see Fig. 67). 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).
1 Fuel delivery
2 Electrical connection
3 Fuel return
4 Telescopic tube
5 Suspension element
6 Fuel pump
7 Suction jet pump
8 Intake strainer
9 Float for fuel level indicator
10 Sender unit for fuel level indicator
11 Reservoir (“swirl pot”)
2 Electrical connection
3 Fuel return
4 Telescopic tube
5 Suspension element
6 Fuel pump
7 Suction jet pump
8 Intake strainer
9 Float for fuel level indicator
10 Sender unit for fuel level indicator
11 Reservoir (“swirl pot”)
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