08-13-2018, 01:06 PM
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#25 (permalink)
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Track Member
Join Date: Dec 2015
Location: South Carolina
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Quote:
Originally Posted by phunk
That what the first thing I was saying... temperature effects the gauges.
You also need to always compare engine vacuum to your fuel pressure. Monitoring your idle fuel pressure without comparing manifold vacuum is sort of like expressing wheel offset without knowing the wheel width. Its mostly erroneous information when one of the major contributing factors is unknown.
Between temperature and engine vacuum fluctuation, you're probably fine. A loss of even a few psi will show a clear change in the A/F. So if you are already closely monitoring your A/F, you are already seeing the aftermath of the fuel pressure. I wouldnt dwell on the fuel pressure much at all unless I was first seeing a problem in the A/F that needed diagnostics. But if you really want to know for sure that everything is OK, you can get nice fuel pressure gauges for less than $200.
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I was comparing the pressure with the vacuum and even with same amount of vacuum pressure I was seeing differences in fuel pressure ...reading from the gauge ...and I was never getting a lean condition ...I guese I was just paranoid ....better to double check something before hand than after a blown motor lol
What got me looking was a very light surging stumble during light acceleration ...checked everything couldn’t find anything ..changed plugs no change I thought the fuel pressure might have been bouncing causing it ....it is only under light throttle and very minor ..it’s around when the vacuum gauge is from 5-0 when I’m cruising at a steady speed .....no issue during boost
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