Weird petcock discovery

[GabrielGoes]

so guys i went to repaint my tank so as i dismounted her i set the fuel on "prim" which i thought was off so gas went straight out the hole and i was like great now i have a broken petcock... as im filling up the bucket for like 5 minutes i decide to change the position onto "on" and "reserve" both settings STOP gas from leaking completly!!! i was like wtf how does gas even come out when i ride with it in the "on" position... does the engine suck the gas out or something? im confused

[drejal]

it has a diaphragm that is vacuum operated. turning the petcock to prime bypasses the diaphragm, thus allowing the gas to flow freely. (i.e. to prime the carbs if they don't have fuel in the bowls)

If you look at the petcock, there are three hoses connected, 1 is the fuel line, 1 is a vent, and 1 is the vacuum line that supplies vacuum once the engine is started.

[Steve]

If you look at the petcock, there are three hoses connected, 1 is the fuel line, 1 is a vent, and 1 is the vacuum line that supplies vacuum once the engine is started.

Close, but not quite.

The fuel and vacuum lines connect to the petcock. The third line is not a vent, it is a "safety" drain line. It is connected to a funnel that covers the gauge opening to catch any drips that might happen, and conduct them away from the top of the hot engine.

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[Nessism]

Funny post. By your use of the word "like" two times in three lines I take it you are young. Consider yourself educated on how a petcock functions now.

[Steve]

Funny post. By your use of the word "like" two times in three lines I take it you are young.

I get that impression, too, whenever I see the first word of a post is "so".

(by the way, there were three 'likes' )
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[tkent02]

So like, you guys are like, really old?

[GabrielGoes]

hahah the thing that is not funny is that im gonna have to take all the bondo off my tank and repaint that my tank repainting process, it is a disaster/nightmare

[BassCliff]

Hi,

I found this article on some guy's website:

Where Do These Hoses Go?

He's collected a lot of info on these GS bikes. Maybe you should read up.


Thank you for your indulgence,

BassCliff

[Steve]

So like, you guys are like, really old?

Not gonna give away my age, but I did watch God make dirt.

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[Buster-boy]

I had a pet dinosaur, but the whole dirt thing has me beat!!

[Buster-boy]

Also, skip that whole Bondo thing. Buy a new tank on ebay, have it blasted down to bare steel, soak it in Vinegar to remove the rust inside, then have it painted.

Been there done that. Graduated from the school of hard knocks!!

[drejal]

Close, but not quite.

The fuel and vacuum lines connect to the petcock. The third line is not a vent, it is a "safety" drain line. It is connected to a funnel that covers the gauge opening to catch any drips that might happen, and conduct them away from the top of the hot engine.

.

that's what i REALLY meant!