Quote:
Originally Posted by hellblau82
So I got my hands on a CIS pressure tester today.
I ran a few tests my first test running the fuel pump with the gauge attached and the WUR not connected showed 2.5-3 bars...when connecting WUR it had no response no increase in pressure as most guides recommend.
I noticed I had a small leak at the fuel pump which I fixed..and retested...and then I got up to 5 bars with the WUR disconnected ..when connecting again no increase..
Does this mean I have a faulty WUR..it was making some squeezing noises I'm leaning towards this being damaged
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Good to hear that you have the pressure gauge available now. It is about time to learn and interpret the pressure readings. Take a picture of the pressure gauge kit installed between the FD and WUR. The shut-off valve should be towards or nearer to the WUR not to the FD.
This is the basic test for system, control, and residual fuel pressures:
1). Install the pressure gauge kit between WUR and FD.
2). Run the FP using the FP relay socket terminals #87A & #30. Avoid using the AFS switch as much as possible.
3). Turn the ignition switch @ ON and start the FP.
4). With the valve completely open, you get the control fuel pressure (cold or warm).
With the valve closed (FP running) you get the system fuel pressure.
5). To evaluate the control fuel pressure, plug the electrical connector to the WUR and run the FP for 4 mins. The very instant the FP ran, that's your cold fuel pressure. Closely observe the control pressure build up after 1 min., 2 min., etc. no more than 4 mins. and record these pressure readings at different intervals.
6). Turn off the FP. The pressure gauge reading @ X psi. (Bar) would go up slightly when after you switched off the FP. If you don't experience this pressure change after the switch off, your fuel accumulator is suspect (?).
7). Lastly, record the pressure drop or change (delta) after shutting down the FP @ zero, 10 min., 20 min., 30 min., etc. This would be your residual fuel pressure.
With the help of this pressure gauge, you could test and evaluate your FP, WUR, and FD effectively and avoid the guess-work which you have been doing the past several months. Keep us posted.
Tony