Some of the push lock hose sold from summit and jegs is not rated for fuel use. I bet that is what deterirated.I have read posts on this site and others about the hose deteriorating quickly. Must be important on who you get it from. May want to do a search just to be safe.
on your trans lines are you using any clamps or the crimp on style sleeves for the high pressurei run it even to my trans no problems - fuel system and all