According to the Hyundai H1 Gasoline This a continuation of teaching.
| Condition | Probable Cause | Remedy |
| Fuel pressure too low | =Clogged fuel filter =Fuel leakage to the return side, Cause by poor steering of the fuel steering of the pressure regulator =Low discharge pressure of the fuel pump | =Replace fuel filter =Replace fuel pressure regulator. = Check the in-tank fuel hose for leakage or replace the fuel pump. |
| Fuel pressure too high | = Sticking fuel pressure regulator. = Clogging or bent fuel return hose return hose or pipe. | = Replacefuel pressuire regulator. = Repair or replace hose or pipe. |
| There is no difference in fuel pressure when the vacuum hose is connected and when it is not. | = Clogged or damage vacuum hose or nipple = Sticking or poor seating of the fuel pressure regulator. | = Replace injector = Replace fuel pump. |
10 Stop the engine and check the for a change in the fuel pressure gauge reading, which should hold for approximately 5 minutes. If the gauge indicator drops, observe the rates at which its drops.Determine and remove the caused according to the following table.
| Condition | Probable Cause | Remedy |
| Fuel pressure drops slowly after engine is stopped. | injector leakage | Replace injector |
| Fuel pressure drops immediately after engine is stopped | the check valve within the fuel pump is open | Replace fuel pump. |
11 Reduce the pressure in the fuel pump.
12 Disconnect the hose and gauge.
Caution
Cover the hose with the shop towel to prevent aplashing of fuel caused by fuel residual pressure in the fuel line.
13 Replace the o ring at the end of the hose.
14 Connect the fuel hose to the delivery pipe and tighten the bolt.
15 Check for fuel leakage.
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