Test 3 - Fuel Pump Flow/Pressure Test
Actually a series of four tests (3a, 3b, 3c and 3d) to determine if fuel pressure is within operating limits while simulating the flow demand of the engine running at wide open throttle. These tests are run with the engine Off and provide a means (based on testing at four points in the system) of determining if the fuel feed line, fuel pump, and fuel filter are operating to design specifications.
The testing is performed using the fuel flow/pressure test adapter (SA9127E-7) which incorporates a precision orifice to meter 50 liters/hr at a delivery pressure of
380 kPa (55psi) for the 2.2 liter (L61).
The flow/pressure adapter consists of:
- Female, quick connect inlet fitting (1).
- Male, quick connect fitting (to pressure gauge) (2).
- Precision orifice fitting (3).
- On/Off flow control valve (4).NOTE: Flow control valve rotates 90 degrees from On (handle in-line with fitting) position to Off.
- Female, quick connect outlet fitting (5).
- Adapter fittings - male 10 mm (3/8 in.) and 8 mm (5/16 in.) quick-connects for fuel lines to 6 mm (1/4 in.) quick-connects on test adapter (6).
It is connected with inlet side to fuel feed, outlet side to fuel return (or drain), and gauge port to pressure gauge or cap. The ON/OFF control valve provides a means to control fuel flow for pressure and leakdown testing.
The test criteria is the fuel pressure read while the fuel pump is energized (refer to Energizing The Fuel Pump ) with the engine Off. If the pressure measured is within specification then the fuel supply is capable of meeting all volume requirements of the engine.