Thread: td5 fuel cooler leaking

I tried a search but tapatalk app is a bit primative, after fitting all new coolant hoses, the fuel cooler has developed a leak, at the front (front of car) of the cooler where the plastic end cap( where the hose goes on) seals in the metal cylinder leaks, but only when it cold, is there an oring kit or do i have to replace the whole cooler or what?

Thanks, im home from our trip with the van now so have access tona real computer