For exactly the reasons just mentioned by MJ I completely replaced all the hoses on my tank when I refoamed my hull a few months ago. It's cheap insurance against present and future leaks. Since you have your tank out I'd take it to a tank shop and have it pressure tested to make sure there are no leaks along seams or pinholes. I wouldn't put it back in unless I was 100% sure it was sound. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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