Transfer pump help...

[rhock99@epix.net (Ryan H)]

I'm trying to replace the TP on my 16V, and I've got the backseat out, along with the screwed down cover for the TP assembly, and all hoses/connections disconnected, but I can't get the metal cap to spin.  I've been hitting it counter-clockwise with a hammer and tap for quite some time now, and all it's doing is making me nervous.  It may have been replaced before, is there a sealer they may have put on it?  Any hints appreciated!