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September 10, 2010, 06:24:30 PM *
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Author Topic: Pressure dropping instead of increasing  (Read 469 times)
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Mad-MAX_SE
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« on: February 25, 2010, 04:33:28 PM »

Hey guys, I was wondering if anyone had any insight as to why my fuel pressure would be dropping when opening the throttle?  I'm still using the pre-installed (if there is one) fuel diverter and was able to get my fuel pressure at idle dialed in fine.  My application is a bit difficult to work on (Maxima)...
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IceMan
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« Reply #1 on: April 29, 2010, 09:04:54 PM »

i believe this issue has been resolved out side of the forum.  if you're still having problems, then give our tech support a call at 858-457-1700.
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Mad-MAX_SE
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« Reply #2 on: July 10, 2010, 02:51:26 AM »

I'm still having problems with the FPR dropping pressure when the car is N/A.  I never did get that part figured out.  The problem has since changed.  Now if i'm driving for any extended period of time (2 hours or more), the fuel pressure keeps dropping slowly over the course of the trip.  I set my fuel pressure (in anticipation of this) to ~50psi and after 3 hours on the road, my pressure was only ~30psi.

I've also recently run into a problem where the boost reference rise rate simply stopped working.  With this problem and the other problem of loss of pressure, I thought it might be a fuel pump issue.  I installed a new walbro 255 pump and it still has the issue.

Any thoughts?
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