Petroleum jelly??? Jabsco SHOULD know better
than to recommend using any petroleum product to lubricate the toilet...petroleum products damage rubber and neoprene seals and valves. Otoh, that does boost their sales of rebuild kits and new heads...so maybe that explains it. Fwiw, NO other toilet mfr recommends using any petroleum product. However, it's not as uncommon as you might think for a mfr to offer a solution to one problem that creates other problems. For one thing, it's usually somebody way down the food chain in the marketing department who writes the owners manuals...they're writers, not engineers, and they prob'ly don't own a boat either. Somebody higher up in the marketing department who isn't an engineer either signs off on it...and in large companies especially, nobody who knows enough to say "bad idea" ever even sees it. And, equipment mfrs tend to think ONLY in terms of that piece of equipment, or solving one particular problem...without any consideration for the fact that it's not "stand alone," but part of a complete system. That was especially true when boats first began to have holding tanks...toilet mfrs were recommending all kinds of things that were just fine when all toilets went directly overboard, without any thought for the impact in a tank. Jabsco isn't the only one... For years, SeaLand recommended pouring straight bleach down a VacuFlush. Why? Because the suction splatters waste all over the inside of the hoses and the vacuum tank, but the flush water volume isn't enough to rinse 'em completely...bleach solved the resulting odor problem. But it also eats the duckbill valves in the vacuum pump and breaks down hose, destroying its resistance to odor permeation. But hey--it stopped the complaints from owners who were being knocked off their feet by odor every time they stepped on the flush pedal....problem solved, never mind that it creates worse problems.I'm not saying that you need to take the pump apart again and clean all that Vaseline out of it...once prob'ly isn't gonna do enough damage to matter. But the next time it needs lubricating, use SuperLube or SeaLube instead. Your seals and valves will last much longer.