Fuel Pressure Regulator: Non-Turbo
- Disconnect negative battery terminal. Using a shop rag wrapped around main fuel hose, disconnect main fuel hose from fuel line. Using a 3-way connector, connect a pressure gauge in main fuel line.
- Reconnect negative battery terminal and start engine. Disconnect vacuum hose from pressure regulator. See Fig 1
. With vacuum hose disconnected and engine idling, fuel pressure should be approximately 37 psi (2.6 kg/cm2
).
- Reconnect vacuum hose to pressure regulator and measure pressure. Fuel pressure should be approximately 28.5 psi (2 kg/cm2
). If not, replace fuel pressure regulator.
Courtesy of MAZDA MOTORS CORP.