12 Volt vacuum pump problem

thanks for all of your input, as far as plumbing the idea is to have a res. to lessen the amount of time the pump runs , I am also thinking along the lines the fuse maybe to small, I have pulled the electric motor/pump assy out count not find any marking as to power needed [amp], the direction say to use a 8-10 amp fuse ??, I think this is to low, I will try to check the amp. draw while running, I bought a front disc, kit thu The Right Stuff Detailing, which inc. the power brake master cylinder and booster, my running vacuum is around13- 14 inches, per there tech support it needs 18 inches, brake pedal is very hard, and not much braking actions, I have an adjustable proportioning valve I am still playing with to get it right