New posting from tonights events.
First, thanks to all for the continued help!
Tonight I changed out the fuel filter with a new AC Delco piece. The replaced one, only had 8,000 miles on it and seemed fine. I still did the change.
Next, I saw a comment on a previous post on how to check for a failing fuel pump or low fuel supply from the tank. Prior to dropping the tank, I preformed this simple test. The post said to have the engine on, turn up the fuel pressure regulator to 100 psi and monitor the fuel pressure guage to see if the needle climbs that high, falls short or starts to flutter. If the psi is not achieved or the neddle starts to flutter, the presumption is the fuel pump/supply from the tank has failed.
Here is were I need your help interpreting my findings. I could NOT increase the fuel pressure regulator past 58-60psi. Specifically, I lossend the nut all the way to the top, then turned the bolt/adjuster all the way in. Again, it would not exceed 58-60psi.
Next, I again did the test I tried last night were I set the fuel pressure regulator to 40psi line off and then added 20 psi of compressed air to a total of 60 psi that did register on the fuel pressure guage. This time I increased the compressed air to 30 psi (40+30=70) but the fuel pressure guage did not exceed 58-60psi. I then increased the compressed air to 40 psi (40+40=80) but the fuel pressure guage did not exceed 58-60psi. Finally, I increased the compressed air to 50 psi (40+50=90) but again the fuel pressure guage would not exceed 58-60psi.
Prior to tonight, my next step was to drop the fuel tank per above advise. With this new information, am I correct in concluding the fuel pressure regulator is the problem?
If so, I am dissapointed. I added this Accufab fuel pressure regulator within the past 3 years and 5,000 miles and have never had the positive experience of achieving a great performing turbo Regal as I have been chasing this tune all over.
I appreciate further advise.
Regards,
Matt