The first thing to do was to release the fuel pressure out of the system, this was done my taking out the fuel pump fuse so no more fuel would be pumped through the system.
Next was to hook up the fuel pressure gauge and start the car to make sure there where no fuel leaks, after checking we found no leaks.
With the key on but engine off we recorded the fuel pressure at 310kpa, this is the engines pre pump so there is pressure in the system.
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The next test was when the engine is idling, the pressure I read was 250kpa, as the engine is just idling the engine does not need as much fuel pressure in the system.
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Then with the engine idling we clamped the return line for a short period with a special tool, the reading we got was 500kpa. This shows us the maximum pressure in the system.
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Next we needed to find out what the pressure is a wide open throttle, instead of holding the throttle at wot we unplugged the vacuum line going to the fuel pressure regulator, the pressure we got from this was 325kpa
The last pressure test is to find out the residual pressure in the system, to do this I just turned the ignition off, I waited 5 minutes before I took the reading, I got a reading of 210kpa.
The last test was to check the fuel flow, this is read on the scale underneath the pressure guage, the reading i got was 2.2 liters a minute or 0.55 liters per 15 seconds.
It is important to know a vehicle fuel pressure and flow because this can give you a good indication weather there is a block somewhere in the lines or the pressure regulator isnt working, there can be big problems if the vehicle isnt getting the amount of fuel it needs.
