Attention! If the fuel lines are unscrewed, they must be pre-washed with cold cleaners (detergents) or gasoline.
Cause | Remedy |
Engine won't start | |
When the starter is turned on, the electric fuel pump does not start (no noise during operation) | Tap the pump housing lightly to loosen a possibly hung pump. Check if there is voltage to the pump. Check electrical contacts for good conductivity. |
Fuse defective | Check the fuel pump fuse. |
Faulty fuel pump relay | Check the relay. |
No voltage to valve injectors | Remove the plug connectors from the injectors, connect a control light and press the starter. The control lamp should blink weakly. If the lamp glows weakly: replace the control unit. If the control lamp does not light up: Check the fuel pump relay. |
A cold engine does not start well, runs irregularly | |
Faulty thermal sensor | Check temperature sensor. |
Faulty oxygen sensor | Have the oxygen sensor checked and replaced if necessary. |
Engine stops (works intermittently) | |
Electrical connections related to the fuel pump intermittently open | Check the plug connections and the electrical wiring connections on the fuel pump and its relay for a tight and flawless connection. Check the fuse and contact points on the fuel pump relay. Clean contacts. |
Too low volumetric fuel supply by the pump | Have a workshop check the volumetric fuel supply. |
Clogged fuel filter | Replace fuel filter. |
Faulty fuel pump | Check fuel pump. |
Leaky injector valve | Check valve injector. |
The engine has defects when operating in transient conditions | |
Leaky air intake system | Check the engine intake system. To do this, leave the engine running in idle mode and coat the sealing points and connections in the suction tract with gasoline. If the speed increases briefly, the existing leak must be repaired. Attention: Gasoline vapors are poisonous, do not inhale them! |
Faulty coolant temperature sensor | Check temperature sensor. |
Leaky power system | Inspect all connections in the area of the engine and electric fuel pump. |
Hot engine won't start | |
Too high pressure in the supply system | Instruct to check the pressure in the power system, if necessary, replace the pressure regulator. |
Clogged or bent drain line between pressure regulator and fuel pump | Clean or replace line (pipeline). |