Hi, I've got a 86 K75 I'm trying to revive, the tank was left unattended for who knows how long. fuel pump purged and fuel sending unit with float arm was left exposed to the elements. there appears to be a build up of crud/rust? on the unit itself. Is there anyway to salvage this part? soak it in something? fuel? or is it replace only? i don't know how sensitive that rheostat is to certain solutions. any thoughts? if replace, anyone got one (and a fuel pump)?