I inherited a older boat with a newer engine , mercury 40hp 4 stroke, year 2000. It has been out of use for years. My brother said it has less than 40 hours on it. last year I used it once and it never seemed to run smooth. it did start every attempt. I disconnected the fuel line between bulb and tank and discovered lines were plugged with varnish. So I cleaned tank and filter, replaced lines, fuel filter. verified fuel gets to filter with no problem. disconnected fuel line marked OUT at fuel pump and cranked motor, gas came out. And that is where im at. Any ideas what to do next? hoping to mess with it this weekend. Thanks