Hyundai Elantra: Fuel Delivery System / Fuel pressure test
| 1. | Release the residual pressure in fuel line. (Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line") | •
| When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the diagnostic tool after completion of "Release Residual Pressure in Fuel Line" work. |
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| 2. | Install the Special Service Tool (SST). | (1) | Disconnect the fuel feed tube from the delivery pipe. | •
| There may be some residual pressure even after “Release Residual Pressure in Fuel Line” work, so cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection. |
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| (2) | Install the special service tool for measuring the fuel pressure in between the fuel feed tube and the fuel delivery pipe (Refer to the figure below). 
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| 3. | Inspect fuel leakage on connections among the fuel feed tube, the delivery pipe, and the SST components with IG ON. |
| 4. | Measure Fuel Pressure. | (1) | Start the engine and measure the fuel pressure at idle. Fuel Pressure : 353 - 500 kPa (3.6 - 5.1 kgf/cm², 51.2 - 72.5 psi) |
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| If the fuel pressure differs from the standard value, repair or replace the related part (Refer to the table below). |
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Fuel Pressure
| Cause
| Related Part
| Too Low
| Fuel filter clogged
| Fuel Filter
| Fuel leakage
| Fuel Pressure Regulator
| Too High
| Fuel pressure regulator valve stuck
| Fuel Pressure Regulator
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| (2) | Stop the engine, and then check for the change in the fuel pressure gauge reading. Standard Value : The gauge reading should hold for about 5 minutes after the engine stops |
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| If the gauge reading should not be held, repair or replace the related part (Refer to the table below). |
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Fuel Pressure (After Engine Stops)
| Cause
| Related Part
| Fuel Pressure Drops Slowly
| Leakage on injector
| Injector
| Fuel Pressure Drops Immediately
| Check valve of fuel pump stuck open
| Fuel Pump
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| (3) | Turn the ignition switch OFF. |
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| 5. | Release the residual pressure in fuel line. (Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line") | •
| When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the diagnostic tool after completion of "Release Residual Pressure in Fuel Line" work. |
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| 6. | Test End | (1) | Remove the Special Service Tool (SST) from the fuel feed tube and the delivery pipe. |
| (2) | Connect the fuel feed tube and the delivery pipe. |
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Components Location1. Fuel Tank 2. Fuel Pump3. Fuel Fiter4. Fuel Pressure Regulator5. Canister6. Fuel tank air filter7. Fuel pump plate cover8. Fuel filler hose9...
Release Residual Pressure in Fuel Line
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There may be some residual pressure even after "Release Residual Pressure in Fuel Line" work, so cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection...
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Release residual pressure in fuel line
