Bahraini240z Posted January 8, 2011 Share Posted January 8, 2011 After installing 40phh Mikuni triple carbs Fuel pressure starts to drop from 7psi to 1.5psi after the car warms up. I'm running an MSD ignition along with a mild cam on a flat top L28. running an electric stock in-tank pump and another stock L28 mechanical pump. What could be causing it and how to solve it? What are ppl running similar setups have? Thanks Quote Link to comment Share on other sites More sharing options...
Bahraini240z Posted January 9, 2011 Author Share Posted January 9, 2011 anyone? Quote Link to comment Share on other sites More sharing options...
Matt K Posted January 9, 2011 Share Posted January 9, 2011 Where's the gauge mounted? Maybe you need a new mechanical pump? Quote Link to comment Share on other sites More sharing options...
Bahraini240z Posted January 9, 2011 Author Share Posted January 9, 2011 gauge mounted on last Carb... Starts reading fine, then it drops. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted January 9, 2011 Share Posted January 9, 2011 (edited) Let me guess, liquid-filled pressure gauge. Edited January 9, 2011 by cygnusx1 Quote Link to comment Share on other sites More sharing options...
Bahraini240z Posted January 9, 2011 Author Share Posted January 9, 2011 yes Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted January 9, 2011 Share Posted January 9, 2011 Switch to a non-filled gauge. Quote Link to comment Share on other sites More sharing options...
Bahraini240z Posted January 9, 2011 Author Share Posted January 9, 2011 Thanks... Will try doing so Is this a common issue with such gauges? Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted January 10, 2011 Share Posted January 10, 2011 Yes, heat can pressurize them internally and negate pressure from the reading. Quote Link to comment Share on other sites More sharing options...
Bahraini240z Posted January 10, 2011 Author Share Posted January 10, 2011 aha... never knew that... Thanks and will keep u posted Quote Link to comment Share on other sites More sharing options...
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