Had the cap off and checked pressure before and after the filter.Its the same.I was playing with my old Holley pumps and it looks like the arm on the newer one is short like 1/16 inch than the old ones.I know the one I bought in 71 is shot for sure.The new arm dosent look worn.I wonder if it could be slightly bent?Ill have to pull the carter and see if the arm is as long.Rocky