| Sign of malfunction | Possible cause | Solution |
| Low fuel pressure | Clogged fuel filter | Replace the fuel filter |
| Fuel pressure drops sharply after pressing the "accelerator" pedal | Fuel leak in the fuel return line due to poor installation of the fuel pressure regulator valve or weak spring tension | Replace the fuel pressure regulator |
| No pressure in the fuel return hose | Low pressure created by the fuel pump | Replace the fuel pump |
| High fuel pressure | Malfunction of the valve in the fuel pressure regulator | Replace the fuel pressure regulator |
| Clogged fuel return hose or tube to the fuel tank | Clean or replace the hose or tube | |
| The same fuel pressure with the vacuum hose connected and disconnected from the fuel pressure regulator | Damaged vacuum hose or clogged fuel pressure regulator nipple | Replace the vacuum hose or clean the fitting |
| Slow drop in fuel pressure after engine stop | Leaking injector | Replace the injector |
| Leaking fuel pressure regulator valve | Replace the fuel pressure regulator | |
| Rapid drop in fuel pressure after engine shutdown | The check valve in the fuel pump does not close | Replace the fuel pump |
Possible malfunctions of the fuel system (Nissan Murano Z50)
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This article has been reviewed: Makar Filatov
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Fuel tank — removal and installation
Fuel quantity sensor, fuel filter and fuel pump
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Fuel pump and fuel pressure — checking
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