Fuel tank vent question

These guys are right, 71 calif., 72 up used cap system which also provided a spec. valve that kept splash back from occuring. I`d say leave it like it is, as long as your cap does`nt fail. I guess older cars you really have to listen when filling or splashback. I have 67 car, will splash back too. Your sending unit should have sock "filter",, you should`nt need that filter @ tank. restriction possibilty, thus cavitating pump. Your call.8)