Common issues & diagnosis
Low pressure fuel pump: The LPFP can fail due to wear, electrical issues or fuel contamination. Symptoms of failure include difficulty starting, engine sputtering, or a loss of power.
High pressure fuel pump: HPFP failures are known issues in certain BMW models. Symptoms include reduced engine power, rough idling and difficulty starting. Failures can be due to mechanical wear, manufacturing defects or contamination.
What is the part's function?
Low pressure fuel pump: The in-tank fuel pump, or low-pressure fuel pump (LPFP), is responsible for delivering fuel from the fuel tank to the engine’s fuel injection system. In port systems the LPFP will send fuel directly to the fuel rail, but in direct injection systems it will send it via the high-pressure fuel pump (HPFP.)
High pressure fuel pump: The HPFP, used in direct injection systems, takes fuel from the LPFP and pressurises it to very high levels (often thousands of PSI), and then sends it the fuel rail, from where it is distributed to the fuel injectors.
How to determine fitment compatibility
Low pressure fuel pump: Each model will have at least two types of low-pressure fuel pump, for petrol and diesel. But they will typically also have additional types for different engines.
We will be able to find a compatible match by decoding your vehicle’s VIN number.
High pressure fuel pump: High-pressure fuel pumps belong to engine type, rather than the model, so there will always be a few different types within each model.
We will be able to find a compatible match by decoding your vehicle’s VIN number.
Interchangeability between models
Low pressure fuel pump: Within the sedan/coupe/wagon models there is some interchangeability between models, but there is less once you get into the SAV/SACs.
High pressure fuel pump: There is a lot of interchangeability between models within the same generation, especially with alike/similar engines.
