When I throttle down from going fast and the wake<br />catches up to me my outdrive trims up slightly.<br /><br />I took the trim pump apart and cleaned and<br />checked everything as best I could. I reassembled and bled all of the lines including the trim sender unit and it still has this problem. I was thinking maybe a weak valve in<br />the trim pump???????<br /><br />It also starts trimming up if I go very fast in reverse (other than at reverse speed much more than idle). FYI, If I put it in reverse gear and try to trim up via the trim switches it doesn't trim so I know the reverse trim lock switch is working.<br /><br />Any ideas would be appreciated.<br /><br />It's a 1972 140 Mercruiser 4 cyl GM block with<br />same vintage trim pump, electronics, and Type I sterndrive.
