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Car fuel supply system parts

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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.

autodoc.parts: Only high-quality automotive products

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.

-72%
Fuel cap FEBI BILSTEIN 27288 car Fuel system parts cost
Reviews - 40
Parts Details
  • Supplementary Article / Supplementary Info Info 2: with support strap
  • Lockable: not lockable
  • Material: Plastic
  • Weight [kg]: 0,081
  • new version
  • FEBI BILSTEIN: Fuel cap
  • Item number: 27288
  • Our price: 8,66 €
  • Condition: New
Details
FEBI BILSTEIN 27288 Fuel cap not lockable, Plastic, with support strap
Article number: 27288
compared to RRP 31,89 €

8,66 €
price incl. 19% VAT, excl. delivery costs
-18%
Fuel cap FEBI BILSTEIN 45550 car Fuel injection parts cost
Reviews - 53
Parts Details
  • Supplementary Article / Supplementary Info Info 2: with support strap
  • Lockable: not lockable
  • for OE number: 16 11 7 482 902
  • Material: Plastic
  • Colour: black
  • Weight [kg]: 0,06
  • FEBI BILSTEIN: Fuel cap
  • Item number: 45550
  • Our price: 16,97 €
  • Condition: New
Details
FEBI BILSTEIN 45550 Fuel cap not lockable, Plastic, black, with support strap
Article number: 45550
compared to RRP 20,93 €

16,97 €
price incl. 19% VAT, excl. delivery costs
Fuel cap AUTOMEGA 140011910 car Fuel injection system parts cost
Reviews - 4
Parts Details
  • Lock System: with lock
  • AUTOMEGA: Fuel cap
  • Item number: 140011910
  • Our price: 5,83 €
  • Condition: New
Details
AUTOMEGA 140011910 Fuel cap with lock
Article number: 140011910
5,83 €
price incl. 19% VAT, excl. delivery costs
-55%
Fuel Hose FEBI BILSTEIN 09487 car Fuel supply parts cost
Reviews - 4
Parts Details
  • Inner Diameter [mm]: 3,2
  • Length [m]: 1
  • Diameter [mm]: 7
  • Colour: black
  • DIN / ISO: 73379
  • Weight [kg]: 0,36
  • FEBI BILSTEIN: Fuel Hose
  • Item number: 09487
  • Our price: 3,31 €
  • Condition: New
Details
FEBI BILSTEIN 09487 Fuel Hose 3,2mm 7mm
Article number: 09487
compared to RRP 7,40 €

3,31 €
Price per item
3,31 € for 1 metre
price incl. 19% VAT, excl. delivery costs
-54%
Fuel Hose TOPRAN 104 538 auto Fuel delivery system parts price
Reviews - 22
Parts Details
  • Packing Type: Reel
  • Diameter [mm]: 3,5
  • DIN / ISO: 73379-2
  • Material: Rubber with fabric lining, NBR (nitrile butadiene rubber)
  • Length [m]: 10
  • Quantity Unit: Metre
  • TOPRAN: Fuel Hose
  • Item number: 104 538
  • Our price: 16,15 €
  • Condition: New
Details
TOPRAN 104 538 001 Fuel Hose 3,5mm
Article number: 104 538
compared to RRP 35,33 €

16,15 €
Price per set of 10 pieces
1,62 € for 1 metre
price incl. 19% VAT, excl. delivery costs
Fuel cap Borsehung B18783 auto Fuel supply system parts price
Reviews - 26
Parts Details
  • Lock System: without lock
  • Borsehung: Fuel cap
  • Item number: B18783
  • Our price: 16,70 €
  • Condition: New
Details
Borsehung B18783 Fuel cap without lock
Article number: B18783
16,70 €
price incl. 19% VAT, excl. delivery costs
-27%
Fuel filter MANN-FILTER P 707 x auto Fuel system parts price
Reviews - 5
Parts Details
  • Height [mm]: 116
  • Diameter [mm]: 65
  • Inner Diameter [mm]: 13
  • Inner Diameter 2 [mm]: 13, 14
  • Supplementary Article / Supplementary Info: with gasket / seal
  • MANN-FILTER: Fuel filter
  • Item number: P 707 x
  • Our price: 7,53 €
  • Condition: New
Details
MANN-FILTER P 707 x Fuel filter with gasket/seal
Article number: P 707 x
compared to RRP 10,45 €

7,53 €
price incl. 19% VAT, excl. delivery costs
-58%
Mass air flow sensor BOSCH 0 281 002 757 auto Fuel injection parts price
Reviews - 19
Parts Details
  • Recommended additional repairs: Air Filter
  • BOSCH: Mass air flow sensor
  • Item number: 0 281 002 757
  • Our price: 61,64 €
  • Condition: New
Details
BOSCH HFM 5 CI Mass air flow sensor
Article number: 0 281 002 757
compared to RRP 148,75 €

61,64 €
price incl. 19% VAT, excl. delivery costs
Fuel cap AUTOMEGA 140030610 cheap Fuel injection system parts
Reviews - 7
Parts Details
  • AUTOMEGA: Fuel cap
  • Item number: 140030610
  • Our price: 22,91 €
  • Condition: New
Details
AUTOMEGA 140030610 Fuel cap
Article number: 140030610
22,91 €
price incl. 19% VAT, free delivery
-51%
Fuel filter MANN-FILTER WK 820/20 cheap Fuel supply parts
Reviews - 9
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 820/20
  • Our price: 48,05 €
  • Condition: New
Details
MANN-FILTER WK 820/20 Fuel filter In-Line Filter, 10mm, 8mm
Article number: WK 820/20
compared to RRP 98,42 €

48,05 €
price incl. 19% VAT, excl. delivery costs
-39%
Mass air flow sensor BOSCH 0 280 218 429 cheap Fuel delivery system parts
Reviews - 25
Parts Details
  • Recommended additional repairs: Air Filter
  • BOSCH: Mass air flow sensor
  • Item number: 0 280 218 429
  • Our price: 41,33 €
  • Condition: New
Details
BOSCH HFM-7-ID Mass air flow sensor
Article number: 0 280 218 429
compared to RRP 68,42 €

41,33 €
price incl. 19% VAT, excl. delivery costs
-7%
Screw, injection nozzle holder METZGER 0871000S cheap Fuel supply system parts
Reviews - 20
Parts Details
  • Bolt / Nut Version: Stretch Bolt
  • Bolt Head- / Nut Design: Female Star
  • Thread Size: M6 x 1
  • Overall Length [mm]: 78,5
  • Thread Length [mm]: 35
  • METZGER: Screw, injection nozzle holder
  • Item number: 0871000S
  • Condition: New
Details
METZGER 0871000S Screw, injection nozzle holder
Article number: 0871000S
compared to RRP 2,35 €

2,17 €
Price per item
price incl. 19% VAT, excl. delivery costs
-72%
Fuel filter MANN-FILTER WK 853/3 x cheap Fuel system parts
Reviews - 61
Parts Details
  • Height [mm]: 177
  • Diameter [mm]: 80
  • Inlet Ø [mm]: 8
  • Outlet Ø [mm]: 8
  • Supplementary Article / Supplementary Info: with gasket / seal
  • MANN-FILTER: Fuel filter
  • Item number: WK 853/3 x
  • Our price: 17,54 €
  • Condition: New
Details
MANN-FILTER WK 853/3 x Fuel filter 8mm, 8mm, with gasket/seal
Article number: WK 853/3 x
compared to RRP 64,82 €

17,54 €
price incl. 19% VAT, excl. delivery costs
-61%
Lambda sensor BOSCH 0 258 007 057 cheap Fuel injection parts
Reviews - 5
Parts Details
  • Overall Length [mm]: 760
  • Number of circuits: 5
  • Recommended change interval [km]: 160000
  • BOSCH: Lambda sensor
  • Item number: 0 258 007 057
  • Our price: 75,84 €
  • Condition: New
Details
BOSCH 17014 Lambda sensor 5
Article number: 0 258 007 057
compared to RRP 195,16 €

75,84 €
price incl. 19% VAT, excl. delivery costs
Hose Fitting ROMIX C70384 cheap Fuel injection system parts
Reviews - 4
Parts Details
  • Number of inlets / outlets: 2
  • Diameter [mm]: 4
  • Material: Plastic
  • Universal: Yes
  • ROMIX: Hose Fitting
  • Item number: C70384
  • Condition: New
Details
ROMIX C70384 Hose Fitting Ø: 4 mm
Article number: C70384
0,39 €
Price per item
price incl. 19% VAT, excl. delivery costs