Well as they said in their email, they would replace the part for me but I gotta send the pump back, which is a bit of an inconvience... The liquid had anti conductant in it already, and, with the cap about 1/3 undone, it doesn't leak as all. So its not too major, but it would be nice to know the cap of the pump is done up all the way!
Guess its down to the hardware store for some sealant to apply liberally.