Air Pump

Start engine and warm to normal operating temperature. Check all hoses and connections for possible leaks. Replace as necessary and/or tighten connections.
Listen for excessive noise at air pump. Replace air pump if noise is excessive. Check drive belt tension. Disconnect hose from air pump outlet and attach a pressure gauge. See Fig 1 .

Fig 1: Air Pump Pressure Output Check Connect pressure gauge as shown.
Connect tachometer to engine and run engine at 1500 RPM. Note pressure reading. Pump must show a pressure of at least 1.0 psi (.07 kg/cm² ). If less, replace air pump.