I just replaced the old 6port valve with new one, my 2002 f-250 ran fine after that, figured it was time to clean the tank because the old cylinoids were all muckedup, pulled 40 gallon tank cleaned & reinstaled, when I tried to purge to make sure everything is working nothing came thru, I heard gurgling in the empty tank & then my truck died from lack of fuel, refilled all lines, the grease lines are empty now so refilled them & still purge is not working, any ideas, I'm thinkin maybe valve a & valve b are mixedup, valve a should be to your right when looking at it installed, if so it is hooked up correctly, any help would be appreciated.