#### TESTING

1. Release the fuel pressure — refer to the service procedure in this section. Connect a fuel pressure gauge (special tool J2540034 or equivalent) between the fuel filter outlet and fuel feed pipe.

   Fig. 1: Installation of fuel pressure test gauge

2. Start the engine and read the pressure. All models except the 240SX, it should be 30 psi (207 kpa) at idle, and 37 psi (255 kpa) at the moment the accelerator pedal is fully depressed. On the 240SX model the pressure should be 33 psi (227.5 kpa) at idle.

   NOTE: Make sure that the fuel filter is not blocked before replacing any fuel system components.

3. If pressure is not as specified, replace the pressure regulator and repeat the test. If the pressure is still incorrect, check for clogged or deformed fuel lines, then replace the fuel pump or check valve if so equipped.