Second Generation Ascots > The V-Twin Years: Stock To Lightly Modified

Recently acured VT500FT

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Bucko:
Ahh..

The vacuum operates a fluid 'switch' on the petcock to allow gas to flow from the tank to the carbs, AKA: Automatic Fuel Valve.  I don't think the AFV typically causes problems and they're handy to have if you're like me and never remember to turn the gas off manually.   In any case, the valve only has three parts: a spring, a diaphragm, and a cover.  Its trivial to disassemble (4 screws) and inspect the parts and the spring and the diaphragm are both replaceable if there is any damage.  If your parts are not damaged but the fuel isn't flowing when vacuum is applied, the problem has to be with the vacuum hose or the vacuum nipple on the cinder head.

joyride20:

--- Quote from: TheMud on May 05, 2017, 11:33:52 pm ---Doesn't require a vacuum to suck the fuel, as all liquids flow to the lowest point due to gravity. If the phrasing is confusing, I apologize. I don't know how else to put it.

--- End quote ---


Hi could you post up a part number for the petcock you used? My stock one has seen better days and i am tired of messing with it. I wouldn't mind switching to aftermarket.

Much appreciated!

TheMud:
http://m.ebay.com/itm/172150831421?_trksid=p2385738.m2548.l4275&_mwBanner=1

Here's a link to the one I got. Didn't see a part number. You'll have to get a smaller diameter fuel line, and step the size up to fit the carb, but it  still supplies plenty of fuel. Don't forget to plug the nipple on the rear cylinder.

joyride20:
The Mud,

Okay thank you for sharing. Much appreciated.

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