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

05UOFX-138
FUEL SYSTEM
F
Fuel Line Pressure 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.
6. Measure the fuel line pressure.
Fuel line pressure:
265-314 kPa (2.7-3.2 kg/cm
2
,
39-46 psi)
Pressure low - Check fuel pump maximum pressure.
(Refer to page F-1 08.) If as specified, fuel
line or fuel filter might be clogged or res-
tricted.
Pressure high - Replace the pressure regulator.
(Refer to page F-111.)
F-103