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Just use a large funnel with a hose and break the nut loose on the tank. Your taking the petcock out anyway, right? And like others have said, toss that vacuum crap and get a regular petcock. I got a oe type non-vacuum j&p petcock for 20 bucks, works like a champ.
This is exactly what I ended up doing. I figured that if I could get the fuel to run out fast it would bring all the dirt with it. If I drained it slowly the dirt would stay behind.
I managed it with minimum mess, and was rather surprised to find that my tank was reasonably clean inside. The fuel valve filter was still clean as well. I also removed the cross-over to check the pipe while I had it all apart.
I phoned around but was unable to find a new fuel valve locally, so I replaced the original for now. I will have to ship a new replacement valve from the USA. I dont like this vacuum setup.
Thanks again for all the advice and comments. It cleared things up for me.
Those $20/$40 petcocks may work for some but they are junk and will leak because they are not designed with quality in mind. I can say this after 2 different Drag Specialty and one other even more expensive ($60) el cheapos. Time wasted. Much gas spilled.
I now have a $129 Pingel and it's the quaility you want too.
The Pingel has a nylon block that turns to the openings for main and reserve. They are very reliable and will outlast 3 cheap ones.
The cheap ones use a rubber grommet with holes in it. The rubber tends to turn soft with today's gas and melt then leak right out the front of the valve.
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