boat wont start if using flush pro??
 

Hey guys, not a newbie to boats but I am to speed :) Have a 1998 outlaw 25, 454 mag. Had a flush pro put on last year. While winterizing I had several issues getting her to run, was a head scratcher. Then while unwinterizing, she ran beautiful after changing lower unit fluid, after changing motor oil, and several test start ups. The minute I throw a hose on her thru the flush pro, she won't run. Just cranks...any ideas what's causing this? Thanks in advance for any replies!