Mercury, 150 efi 2 stroke 2007

The electronic oil pump leaks from the solenoid cap in way of the electrical plug. Recently replaced inline oil filter and brass fitting to the motor oil tank. Removed motor from boat to test stand and discovered oil lines from boat tank to motor tank after the low level alarm went off during motor being tested at idles. Swapped lines in proper order, bled air from top of motor tank and ran on test stand several times, when noticing the pump oil leak after shutting down, but not during run. Any ideas of the problem?