maybe one of you guys can give me an idea of why my fuel pressure is changing for no good reason, if i set f/p at 6-7 lbs it will drop down to 3-4 or sometimes it will be up around 11 lbs, i have a barry grant 220 h/r pump feeding 2 demon 850 blower carbs which are junk imo on an 871 fed by a -10 with a -8 return, i bought the pump about 6-7 years ago and just got the car finished and running, i have used this setup before with no problems, not that it should matter but i will be changing the carbs out to a set of quick fuel blower carbs, any input would help.