As a temp fix to get you mobile, you could insert a short length of pipe with a slightly smaller outside diameter inside the broken plastic section.
Copper might be easiest to get hold of.
Otherwise you could dry some sort of glue or sealant to do a temporary repair the broken plastic section.
Another option to get you mobile would be to cut the plastic tabs off the old tank to enable you to remove it, attach the pipework to the new tank and hold it in place using some cable ties or metal straps.
None of the above solutions will look pretty but if you need to use your car ....
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