Yeah, one has to be careful with polymer compatibility everywhere these days. (The HVAC industry is a real can o worms!)
I remember when I had the Toyota I would add marvel Mystery Oil to the gas tank to help lube the upper end on the new motor. Must have added a bit too much, as the auxillary accelerator pump on the carb had the diaphram dissolve and flood the thing with gas till the engine warmed up. Then fine. Seems the solvents in the MMO don't like new rubber parts.