| I guess this issue has been going on for years since I went e85 and replaced fuel components. I set base fuel pressure(no vac 43.5psi), after a drive, it will read a few psi low, I adjust up back to 43.5psi, and drive - reads low, adjust..until it starts running bad at top end (too much fuel), then seemingly fuel pressure start reading 50+psi. My pump F90000267 and FPR Tomei Type L I have had for 4 years, but generally has not quite been right, digging into it more now (parts from CZP, counterfeit?...). I've gone from bypassed FPC (using factory + wire, upgraded - wire) to now running full bypass radium harness to battery plus Polar Eng fuel hanger (using my same pump). Didn't help. Replace fuel filter, no change. I replace fuel gauge with Marshall thinking maybe it has issue (my first Tomei gauge was bad out of box, 2nd one seemed fine), but no change (still inconsistent readings). Pressure is stable when running and increases 1:1, just seems to degrade over time/heat? So I think I'm down to FPR issue or pump? Should the FPR hold pressure no matter pump psi? or is it always just a ratio?(Pump fluctuating pressure?) Some example numbers:
Tomei gauge cold start idle
46psi, battery 14.3V pump current 16.4A
Replaced marshall gauge, nothing else, cold start idle
42psi(adjusted to 43.5psi), 14.2V 16.2A
Went for a long drive, hot idle
40psi 14V 15.4A
Next morning cold start idle
47psi 14.3V 16.5A
Cold start let warm up for 5 min
46psi 14.2V 15.9A
Or could Alternator Voltage fluctuations a few tenths cause these pressure changes? Any experience with something like this, or M I looking too close into it? lol
Main thing that got me here again was just a periodic check of fuel pressure that I kept raising till apparently too much and ran poorly (sometimes it even seems removing the gauge/pressure seemed to 'reset' things) Thanks all
2+2=4; 2+0=2; 4>2 : 2+2 > 2+0. |
14:55:37 06/08/24
