#1. supply line from high pressure pump #2. return line from fuel rail #3. vent line, line going up to your intake manifold #4. circulating water line #5. fuel line from gas tank #6. high pressure pump socket #7. low pressure pump socket
#4. circulating water line #10. circulating water line (including 17.5'' hose)
OEM part numbers: 21608511/ 21545138/ 21397771/ 3594444/ 3861355/ 3860210
Symptoms of wear or malfunction: 1. The whining noise of the fuel tank / 2. Difficulty starting / 3. Engine sputtering / 4. Stall at high temperature / 5. Power loss under pressure / 6. Low fuel consumption