nothing really...
JB Weld advertises their SteelStik epoxy product to be fuel safe once fully cured. But some of their plastic-specific products they state do not adhere to polyethylene, which takes them off the table. If their SteelStik will adhere to polyethylene, then it might be an option. But this would have to be investigated.
Otherwise you will have to either melt the plastic together, get it plastic (sonic) welded, or physically clamp it back on somehow.
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