Pressure Regulator; Fuel Line Pressure - Mazda MX-5 1990 Workshop Manual

05UOFX-163
05UOFX-164
05UOFX-166
FUEL SYSTEM
F
PRESSURE REGULATOR
Caution
• Obtain the code number and deactivate the audio
anti-theft system before disconnecting the battery.
(Refer to page T
-113.)
Inspection
Fuel line pressure
Warning
• Before performing the following operation, relase
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. Connect a fuel pressure gauge between the fuel main pipe
and the fuel main hose. (Install clamps as shown.)
3. Connect the negative battery terminal.
4. Start the engine and run it at idle.
5. Measure the fuel line pressure.
Fuel line pressure:
216-265 kPa (2.2-2.7 kg/cm
2
,
31-38 psi)
Hold pressure
Perform this inspection if the fuel pressure hold inspection is
not as specified. (Refer to page F-102.)
Warning
• Before performing the following operation, relase
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-l0l.)
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 FIP 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. Block the outlet of the pressure regulator.
8. Observe the fuel pressure for 5 min ..
Fuel pressure:
More than 147 kPa (1.5 kg/cm
2
,
21 psi)
9. If pressure is as specified, replace the pressure regulator.
F-111
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