I've spent quite a while refurbishing the coolant system on this miller:
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It hasn't been run with coolant for about 15 - 20 years and the tank had been left full, the coolant that was in it was almost solid, the pump needed striping down and fitting with a new filter and all the pipework needed replacing.
Today I finally got everything running and filled it with DD1 cleaner, 20 minutes later the cleaner started pooling on the floor. I thought this might happen given how rotted the pump filter was:
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The question now is what can I do about it?
Welding is out of the question, the tank is part of the casting and has very limited access
The only two things I can think of is some kind of sealant, I have no idea what would withstand coolant, or to plastic weld a whole new tank assembly and drip tray that somehow fits inside?
Any idea's are most welcome

It hasn't been run with coolant for about 15 - 20 years and the tank had been left full, the coolant that was in it was almost solid, the pump needed striping down and fitting with a new filter and all the pipework needed replacing.
Today I finally got everything running and filled it with DD1 cleaner, 20 minutes later the cleaner started pooling on the floor. I thought this might happen given how rotted the pump filter was:

The question now is what can I do about it?
Welding is out of the question, the tank is part of the casting and has very limited access
The only two things I can think of is some kind of sealant, I have no idea what would withstand coolant, or to plastic weld a whole new tank assembly and drip tray that somehow fits inside?
Any idea's are most welcome