This is a 2004 thread, but perhaps you all can guide me here to not throw too many parts at it. I searched for the info but didn't find what I hoped for.
My car has a similar problem of fuel pressure dropping after shut down. The initial indications were slow to start on cranking and then slightly sluggish running until she warms up. Then while starting/stopping around town she runs perfect. The next day after sitting overnight, it repeats. Over the past month or so, it has worsened.
It happens gradually over a few hours so that running it is 28 PSI and the next AM it is zero. I measured by placing a guage at the Cold Start Valve. In fact, after the first few minutes after shut down it drops a few pounds and continues. It isn't a leak cuz there is no fuel smell at all. She doesn't smoke on start or run either.
It sounds like a classic fuel pressure reg issue, but does anyone have other ideas to be sure I hit all sides of this problem?
By the way, I havn't been on this forum for over a year because the help I received before had helped me square my girl away so well! Thanks to all of you, then and now.
Scott
Quote:
Originally Posted by erubin
mbz72,
If your car has fuel injection read on, if it is carburated ignore the following:
I had the same problem with my fuel injected 1972 4.5L engine. After replacing the fuel regulator the problem went away. I trouble shot by putting a pressure gauge with a "T" on the line. Sure enough the pressure would bleed down to 0 psi pretty quickly evn though it should remain pressurized for many hours. No problem starting cold because the auxiliary valve injector pumps in additional gas and masks the defective regulator on cold start up. it would also start up fine within 5 minutes of shutting down the engine because the pressure would not dissapear immediately. the pressure reg is not too $$. I recal something around $60.
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