sahtt Posted July 3, 2006 Share Posted July 3, 2006 Had the best shop I know of in Houston, C&C Northside Automotive try to diagnose my car and Kurt said it was DEFINETELY fuel and probably the fuel pump. I changed the pump, no difference. It is either the fuel pressure regulator, which I'm having a VERY difficult time finding discounted, or one of the sensors. Anyone have a recource I would use to check which sensors it is and what Ohm reading each should be in? Anyone know of a better place to get a fuel pressure regulator for a 91 LS400 for less than 166.xx$? Quote Link to comment Share on other sites More sharing options...
SKperformance Posted July 3, 2006 Share Posted July 3, 2006 Have they not checked the fuel pressure ? Quote Link to comment Share on other sites More sharing options...
Toysrme Posted July 3, 2006 Share Posted July 3, 2006 Werd. Check the fuel pressure, and the residual fuel pressure after it's sat for 5min. Quote Link to comment Share on other sites More sharing options...
sahtt Posted July 3, 2006 Author Share Posted July 3, 2006 Werd. Check the fuel pressure, and the residual fuel pressure after it's sat for 5min. Did so, that's how he diagnosed the fuel pump. He couldn't get any signs from the return line to suggest the fuel pressure regulator. It's difficult to do because it seems to only have its worst problems when I'M driving it. He checked the fuel pressure after the pump and got almost 0 until the pump had plenty of time to cool off, as in over an hour. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted July 3, 2006 Share Posted July 3, 2006 It may be a bad wiring connection check the pump wiring. Quote Link to comment Share on other sites More sharing options...
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