Fuel Pressure Hold Inspection - Mazda MX-5 1990 Workshop Manual

F
05UOFX-135
F-102
FUEL SYSTEM
SYSTEM OPERATION
Caution
• Obtain the code number and deactivate the anti-
theft system before disconnecting the battery.
(Refer to page T-113.)
Fuel Pressure Hold Inspection
Warning
• Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-101.)
1 . Disconnect the negative battery terminal.
2. Install a fuel pressure gauge between the fuel pipe and the
fuel main hose. (Install clamps as shown.)
3. Connect the negative battery terminal.
4. Connect diagnosis connector terminals F/P and GND with
a jumper wire.
5. Turn the ignition switch ON for 10 sec. to operate the fuel
pump.
6. Turn the ignition switch OFF and disconnect the jumper wire.
7. Observe the fuel pressure after 5 min.
Fuel pressure:
More than 147 kPa (1.5 kg/cm2, 21 psi)
8. If not as specified, perform the following inspections.
• Fuel pump hold pressure (Refer to page F-107.)
• Pressure regulator hold pressure
(Refer to page F-111.)
• Injector fuel leakage. (Refer to page F-113.)
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