The fuel pumps of modern vehicles are highly efficient and, with proper care, provide a continuous supply of fuel, regardless of the load being generated. The operation of the engine at idle speed is impossible without the presence of a fuel filter valve.

1. A4 (8D2, B5)
2. A4 Saloon (8D2, B5)
3. A4 / S4 (8D2, B5)
4. POLO (6N1)
5. CADDY II Box Body/MPV (9K9A)
6. VAN II Box Body/MPV (9K9A)
7. PANEL II Box Body/MPV (9K9A)
8. CADDY Mk II (9K9A)
9. A4 Avant (8D5, B5)
10. A3 (8L1)
11. A3 / S3 (8L1)
12. PASSAT (3B2)
13. PASSAT Saloon (3B2)
14. CORDOBA (6K1, 6K2)
15. CORDOBA Saloon (6K1, 6K2)
16. IBIZA II (6K1)
17. IBIZA Mk II (6K1)
18. OCTAVIA I (1U2)
19. PASSAT Variant (3B5)
20. PASSAT Wagon (3B5)
21. See more in applications

The operational principle of a VAICO brand Valve, fuel filter

All the warm return goes immediately (and only) to the filter (in a small circle) and dissolves the paraffin, preventing the filter element from clogging. At this time, there is a minimum intake of fuel from the tank (compensation for the spent fuel), and paraffin (almost) does not rush to the grid in the tank and also does not close it up.

The main purpose of this valve is to prevent the formation of too high pressure in the fuel system, because of which fuel hoses can break. In principle, the purpose of any valve is to ensure the movement of different fluids in the same main direction. Being in the fuel system, this valve prevents a number of problems that can occur in the system because of a broken hose.