ballast resisters

after playing with it last night , I'm pretty sure it looses it's prime with higher rpm's , I checked the voltage at the battery , and at the pump , and they are the same , they both go higher as the rpms go up. after I ran it dry , I switched it back to pump out of the 5 gal can , but it wouldn't prime / pump . after putting it back to the tank and sitting awhile , I guess gravity helps it get primed again. Any how I'm going back to a mechanical pump for now , since the electric is too high up , and wire wrong , and mechanic pumps are cheep.