New FPR fails leak down test - is it defective?
I've been having a number of issues that led me to the FPR leak down test. With the original FPR, key on for 2 seconds, the pressure was 51lb and when the pump kicked off, the pressure dropped to 46 lbs. After 10 minutes, the pressure dropped to 36 lbs (once to 20 lbs).
I repeated the test several times and sometimes the pressure dropped to only 41lbs per spec, but other times to the 36lb range. I tried gently tapping the regulator while it was leaking down, and I saw it drop 5lbs and with a little more tapping, another 5lbs so I replaced the regulator.
With the new regulator, when I turned the key on for 2 seconds the pressure went to 51, but when the pump kicked off, the pressure immediately went to 20 lbs. I tried it several times with the same results (car starts OK). My question is did I get a defective regulator or is it exposing symptoms of another problem (leaky injector or bad pump)?