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Home >> Mazda >> 1986 >> 323 L4-1600 1597cc >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Fuel Pressure >> Testing and Inspection
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Fuel Pressure: Testing and Inspection




1. Disconnect fuel hose from fuel filter. Cover hose with rag as fuel will be splashed out when disconnecting hose.
2. Connect pressure gauge to fuel filter.
3. Using three-way joint, connect pressure gauge between fuel hose and fuel filter.
4. Connect battery ground cable and start engine. Fuel pressure should measure 28-31 psi at idle.
5. Disconnect and block vacuum hose from pressure regulator. Fuel pressure should measure 37-41 psi.
6. If fuel pressure is not as specified, replace the pressure regulator.


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