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This is what I use.I've been using taps from Screwfix for several years without any problems. From memory, they are around £6.00 and don't seem to have any leaking problems. They are sold for washing machine/central heating, etc.
That's the one. Thanks for the tip about the filters, I've ordered two. I've got two external filters fitted but they do make routing the hose more difficult.This is what I use.
Order online at Screwfix.com. For water, natural gas, LPG. ¼ turn operation. British Gas approved. FREE next day delivery available, free collection in 5 minutes.www.screwfix.com
The 8mm description is the pipe o/d and is withing a couple of throu of 5/16". Discard the nuts and olives and the thread on the body is 1/4 BSP and fits straight into the fuel tank and straight onto the std Vincent fuel pipes. I also remove the yellow plastic tab off the lever. Another thing I do is thread the tank end of the tap body internally and fit a fuel filter which is available from several places:
Fuel Tap Filter Replacement - Petrol Tap Filter Plastic fine mesh filter, screws onto the fuel tap Classic motorcycle replacement spares and parts.www.feked.com
I just push the brass petcock's tapered valve lightly, in from the spring side and twist it back and forth a couple of times and it unsticks. Been using them for donkey's ages with no gauling.Any seals exposed to modern fuel have to be Viton, teflon or cork, no NBR will do. So when going for o-rings or fuel tap seals you will choose viton or cork. Alcohol is NOT the point but all these thinners in the fuel like acetone, toluol, butane . So you could decide on the all brass taper type taps or modify the plain gasket taps like below in links for cork seals, rubber will not do. Auto fuel does not lubricate the rubber seal so operation is not smooth. I had best success with home made cork seals in the plain gasket types but then apart from the fiddling with delicate corks sanding them flat and drilling four holes to suit the tap housing you will be exposed to several bottles of red wine till you got a suitable collection of corks for that job - ah well, so be it . . . .
The all-brass taper type tabs will not work in the long run as like materials, brass on brass , cone-in-case , will lead to seizures and f***ed-up faces on the tapers and consequent leaks. So you´d copy the taper in stainless and lap that in the case for a permanent solution.
The ball valve taps should have teflon seals so great for modern fuels but I would not accept them on my classics for ruining the looks.
fuel tap 1/4
tap 1/4 "
circlip tap 1/4