Fuel not returning to the fuel tank is a common issue that can be caused by multiple factors. These include:
- Clogged or worn fuel lines preventing the return of fuel from the engine back into the tank.
- Faulty check valves allowing air to enter the system and prevent fuel from flowing back properly.
- A defective in-tank low pressure pump not creating enough suction for the return of fuel.
- The presence of contaminants, such as dirt and rust, which block or impede flow through the system.