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Fuel supply system car spares

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Fuel injection: all the information you need about part operation, installation, diagnostics, and longevity

A vehicle’s fuel system is designed to store and filter fuel, as well as supply it to the engine cylinders. Engine stability and performance depend on it.

Design of the fuel system

The fuel systems of various vehicles may differ. The main differences lie in the way the fuel is injected. Nevertheless, every vehicle has a tank to store fuel, a filter to purify it, a pump to supply it to the engine, delivery and return pipelines, and sensors which monitor, among other things, fuel level and other parameters.

Petrol vehicles may have the following types of fuel injection:

  • Single-point fuel injection (SPI). A single injector supplies fuel into the inlet manifold. This is where the air-fuel mixture is formed.
  • Multipoint fuel injection (MPI). There is an injector for each cylinder in the system. The fuel supply line is divided with the help of a special fuel distributor.
  • Direct fuel injection. This includes a high-pressure line with another pump and a fuel rail. Fuel is supplied directly to the combustion chambers under high pressure.
  • Combined fuel injection. Such fuel systems are equipped with high and low pressure fuel rails. High-pressure fuel injectors are installed into combustion chambers, while the low-pressure ones are built into the inlet manifold. The control unit selects the method of fuel supply depending on the engine operating mode.

The following types of injection systems are common in diesel vehicles:

  • High pressure fuel pump. Fuel is supplied to the injectors via high pressure pump.
  • Unit injectors. They ensure a layered injection of the fuel right into the combustion chambers. These components are driven by the camshaft.
  • Common Rail. This encompasses a rail and a high-pressure fuel pump. The injectors are installed in the combustion chambers and are connected with the rail via a high-pressure pipeline.

Maintenance tips

  • Refuel your vehicle at reliable filling stations. This will help you avoid corrosion and deposits in the fuel system, as well as to avoid the contamination of its components.
  • Replace fuel filters on time. If the throughput capacity of a filter is restricted, all components of the fuel system are exposed to severe strain.
  • Keep your fuel tank at least half full, especially during cold weather. Otherwise, the condensation may cause difficulties with starting the engine. Sometimes tanks begin to rust.
  • Every six months, add a special additive to the fuel tank to remove moisture. This is an excellent preventive measure which will help to extend the service life of the system’s components.
  • Regularly clean the injectors. In some cases, you can use a special additive for that purpose. However, it is much more effective to have them cleaned at a car repair shop.

Signs of malfunction

Difficulties when starting engine or reduced engine power can be caused by a diminished performance of the fuel pump. Engine malfunctions in every mode is a sign of a clogged filter. The same symptoms can be observed when the return pipeline is deformed, but in this case, the problem is accompanied by increased fuel consumption. The smell of petrol, coloured puddles beneath your car after parking, and significantly increased fuel consumption are symptoms of a leaky fuel system. Clogged injectors may result in engine misfiring, unusual sounds, and jerky movements while driving.

Causes of malfunction

These problems mostly occur due to fuel that is low in quality or contaminated. It contains particles which clog the filter and other system components. As a result, the pump can break down. Water is also harmful, especially, for diesel engines: The components of the fuel system are made of materials prone to corrosion. This may cause moving parts to jam. Furthermore, the throughput capacity of the injectors and pressure regulator is impaired.

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You can always buy high-quality fuel system components for your vehicle in our online shop. They are offered at affordable prices. Additionally, you have an opportunity to save on delivery.

Useful information on functions, causes of malfunction, diagnosis and replacement intervals

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Top 15 bestselling products in the category Fuel injection system

Recommended parts in the Fuel supply section. These are our bestselling products. Order these car parts or browse our large assortment for great deals and offers.

-15%
Buy NOx Sensor, NOx Catalyst NGK 93015 - Fuel system parts online
Parts Details
  • Number of circuits: 6
  • Length [mm]: 1085
  • NGK: NOx Sensor, NOx Catalyst
  • Item number: 93015
  • Our price: 486,65 €
  • Condition: New
Details
NGK NZA05-V4 NOx Sensor, NOx Catalyst
Article number: 93015
RRP

577,15 €
486,65 €
price incl. 19% VAT, free delivery
-59%
Buy Lambda sensor BOSCH 0 258 017 025 - Fuel injection parts online
Parts Details
  • Overall Length [mm]: 1000
  • Number of circuits: 5
  • Recommended change interval [km]: 250000
  • BOSCH: Lambda sensor
  • Item number: 0 258 017 025
  • Our price: 87,54 €
  • Condition: New
Details
BOSCH 17025 Lambda sensor 5
Article number: 0 258 017 025
RRP

215,00 €
87,54 €
price incl. 19% VAT, excl. delivery costs
-42%
Buy Fuel filter MANN-FILTER WK 842 - Fuel injection system parts online
Parts Details
  • Filter type: Spin-on Filter
  • Height [mm]: 155
  • Diameter [mm]: 82
  • Thread Size Exit: M 16 X 1.5
  • Gasket inner diameter: 61
  • Seal Ring Outer Diameter: 70
  • MANN-FILTER: Fuel filter
  • Item number: WK 842
  • Our price: 10,65 €
  • Condition: New
Details
MANN-FILTER WK 842 Fuel filter Spin-on Filter
Article number: WK 842
RRP

18,53 €
10,65 €
price incl. 19% VAT, excl. delivery costs
-40%
Buy Fuel filter MANN-FILTER WK 731 - Fuel supply parts online
Parts Details
  • Filter type: Spin-on Filter
  • Height [mm]: 117
  • Diameter [mm]: 76
  • Thread Size: M16x1.5
  • Gasket inner diameter: 62
  • Seal Ring Outer Diameter: 71
  • MANN-FILTER: Fuel filter
  • Item number: WK 731
  • Our price: 6,81 €
  • Condition: New
Details
MANN-FILTER WK 731 Fuel filter Spin-on Filter
Article number: WK 731
RRP

11,44 €
6,81 €
price incl. 19% VAT, excl. delivery costs
-61%
Fuel filter MANN-FILTER WK 820/17 - Fuel delivery system spare parts order
Parts Details
  • Filter type: In-Line Filter
  • Height [mm]: 100
  • Diameter [mm]: 86
  • Inlet Ø [mm]: 10
  • Outlet Ø [mm]: 8
  • MANN-FILTER: Fuel filter
  • Item number: WK 820/17
  • Our price: 75,39 €
  • Condition: New
Details
MANN-FILTER WK 820/17 Fuel filter In-Line Filter, 10mm, 8mm
Article number: WK 820/17
RRP

193,92 €
75,39 €
price incl. 19% VAT, excl. delivery costs
-18%
Adjusting Potentiometer, idle mixture BOSCH F 026 T03 021 - Fuel supply system spare parts order
Parts Details
  • BOSCH: Adjusting Potentiometer, idle mixture
  • Item number: F 026 T03 021
  • Our price: 217,44 €
  • Condition: New
Details
BOSCH F 026 T03 021 Adjusting Potentiometer, idle mixture
Article number: F 026 T03 021
RRP

267,00 €
217,44 €
price incl. 19% VAT, free delivery
Pliers, fuel line quick coupling HAZET 4501-1 - Fuel system spare parts order
Parts Details
  • Net weight [kg]: 0,06
  • Length [mm]: 155
  • Blade tip material: Chrome Vanadium Steel
  • Material: Plastic
  • Tool handle material: Ash wood
  • HAZET: Pliers, fuel line quick coupling
  • Item number: 4501-1
  • Our price: 43,63 €
  • Condition: New
Details
HAZET 4501-1 Pliers, fuel line quick coupling
Article number: 4501-1
43,63 €
price incl. 19% VAT, excl. delivery costs
Fuel filter MANN-FILTER WK 842/4 - Fuel injection spare parts order
Parts Details
  • Filter type: In-Line Filter
  • Height [mm]: 148
  • Diameter [mm]: 80
  • Inlet Ø [mm]: 8
  • Outlet Ø [mm]: 8
  • MANN-FILTER: Fuel filter
  • Item number: WK 842/4
  • Our price: 15,60 €
  • Condition: New
Details
MANN-FILTER WK 842/4 Fuel filter In-Line Filter, 8mm, 8mm
Article number: WK 842/4
15,60 €
price incl. 19% VAT, excl. delivery costs
-21%
Fuel injection system parts - Valve, fuel pump PIERBURG 7.20235.02.0
Parts Details
  • Valve type: Non-Return Valve
  • Number of connectors: 2
  • Pressure [bar]: 0,15
  • Pressure [psi]: 2,18
  • Diameter [mm]: 8
  • Technical Information Number: PI 1547-11
  • PIERBURG: Valve, fuel pump
  • Item number: 7.20235.02.0
  • Our price: 11,39 €
  • Condition: New
Details
PIERBURG 7.20235.02.0 Valve, fuel pump
Article number: 7.20235.02.0
RRP

14,43 €
11,39 €
price incl. 19% VAT, excl. delivery costs
-70%
Fuel supply parts - Throttle body PIERBURG 7.14319.09.0
Parts Details
  • Supplementary Article / Supplementary Info Info 2: Control Unit / Software must be trained / updated
  • Observe the vehicle manufacturer specifications
  • Diameter [mm]: 58
  • Voltage [V]: 12
  • Operating Mode: Electric
  • PIERBURG: Throttle body
  • Item number: 7.14319.09.0
  • Our price: 241,21 €
  • Condition: New
Details
PIERBURG 7.14319.09.0 Throttle body Ø: 58mm, Electric, Control Unit/Software must be trained/updated
Article number: 7.14319.09.0
RRP

807,28 €
241,21 €
price incl. 19% VAT, free delivery
-60%
Fuel delivery system parts - Fuel filter MANN-FILTER PU 936/1 x
Parts Details
  • Height [mm]: 116
  • Diameter [mm]: 84
  • Inner Diameter [mm]: 19
  • Supplementary Article / Supplementary Info: with seal
  • MANN-FILTER: Fuel filter
  • Item number: PU 936/1 x
  • Our price: 22,80 €
  • Condition: New
Details
MANN-FILTER PU 936/1 x Fuel filter with seal
Article number: PU 936/1 x
RRP

57,09 €
22,80 €
price incl. 19% VAT, excl. delivery costs
-55%
Fuel supply system parts - Fuel pressure regulator BOSCH 0 280 160 575
Parts Details
  • BOSCH: Fuel pressure regulator
  • Item number: 0 280 160 575
  • Our price: 29,84 €
  • Condition: New
Details
BOSCH 0 280 160 575 Fuel pressure regulator
Article number: 0 280 160 575
RRP

67,00 €
29,84 €
price incl. 19% VAT, excl. delivery costs
-66%
Fuel system parts - Fuel filter MANN-FILTER WK 820/14
Parts Details
  • Filter type: In-Line Filter
  • Height [mm]: 100
  • Diameter [mm]: 86
  • Inlet Ø [mm]: 10
  • Outlet Ø [mm]: 8
  • MANN-FILTER: Fuel filter
  • Item number: WK 820/14
  • Our price: 67,53 €
  • Condition: New
Details
MANN-FILTER WK 820/14 Fuel filter In-Line Filter, 10mm, 8mm
Article number: WK 820/14
RRP

200,75 €
67,53 €
price incl. 19% VAT, excl. delivery costs
-61%
Fuel injection parts - Fuel filter MANN-FILTER WK 857/1
Parts Details
  • Filter type: In-Line Filter
  • Height [mm]: 276
  • Diameter [mm]: 81
  • MANN-FILTER: Fuel filter
  • Item number: WK 857/1
  • Our price: 53,53 €
  • Condition: New
Details
MANN-FILTER WK 857/1 Fuel filter In-Line Filter
Article number: WK 857/1
RRP

139,28 €
53,53 €
price incl. 19% VAT, excl. delivery costs
-68%
Fuel injection system parts - Lambda sensor NGK 1842
Parts Details
  • Length [mm]: 810
  • Number of circuits: 5
  • NGK: Lambda sensor
  • Item number: 1842
  • Our price: 113,19 €
  • Condition: New
Details
NGK LZA11-V4 Lambda sensor 5
Article number: 1842
RRP

360,51 €
113,19 €
price incl. 19% VAT, excl. delivery costs