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Does anyone have the tutorial about how to make a stock vacuum petcock a manual ON/OFF type??? Thanks.
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add an on/off valve... $5-$10.. just need the hose, clamps and mount. Total $15
Gas line coming out of petcock ---> on/off valve inlet ---> on/off valve outlet ---> carbs/fuel rail . vac caps, hole in diaphragm etc.
not what you lookin for as answer ... but here is a video
convert vacuum to manualLast edited by Guest; 02-24-2017, 12:12 AM. -
Tkent wrote up a little piece about it. Sometime last year maybe.sigpic
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With the existing tap, working properly, simplest way is: remove fuel tap vacuum line and put a plug in it. (to stop air being sucked into intake manifold)
Turn petcock to "Prime" position = Gas ON
Other positions =gas OFF ( because thereby,you have disabled the vacuum that pulls the the "fuel flow piston" out against spring pressure. )Comment
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This is a good idea that would never work for me... I'm too stupid to remember to switch mine from "Pri" to "On" after I start it and have flooded my crankcase with gas at least 2x because of it. LOL!
It would be nice to find an electrically operated one... or some float needles that didn't leak.1982 GS1100E "Jolene"Comment
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Well no tap is going to work well if your float needles aren't working. If you are finding oil in gas when left on Prime, maybe you are running rich when riding too. More so with a full tank. I suppose It can be a can of worms because the carburetor gets tuned to allow for fuel supply problems....Comment
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I just think its the nature of those carb float needles... if it wasn't they wouldn't need the vacuum operated petcocks to begin with.1982 GS1100E "Jolene"Comment
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Yep. They're not designed to nor are they capable of holding back a tank of gas for very long. If the petcock isn't shut off by hand or by vacuum, you WILL get a crankcase full of gas. They'll usually make it through lunch OK, but definitely not overnight.Originally posted by TxGSrider View Post1983 GS850G, Cosmos Blue.
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What I do think is a little odd though, is that Ive got a couple of atvs that have manual petcocks and they'll set for weeks and not leak a drop. I wrote it off to maybe they do leak just a little and its not noticeable... but since theres 4 carbs on my GS and each one leaks just a little... its way more noticeable.Originally posted by bwringer View Post1982 GS1100E "Jolene"Comment
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