Vacuum Valve

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Beef
Posts: 288
Joined: Mon Jun 12, 2017 10:01 am
Location: Reading -ish

Vacuum Valve

Post by Beef »

I know there’s plenty on here about the issues of them and how to fix them etc, but when I was carrying my tank to shed, my hose from valve started leaking fuel. Now assuming the valve is stuck open, should I be bothered to take it all apart?
Bearing in mind I have a fuel pump so gravity flooding of the carbs is unlikely.
Thoughts please?
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8541Hawk
Posts: 2066
Joined: Sat Jul 21, 2012 5:21 am
Location: Bella Vista, AR

Re: Vacuum Valve

Post by 8541Hawk »

The fuel shut off is a separate bit from the vacuum diaphragm.

The shutoff is a kind of barrel shaped bit the rotates and blocks the fuel flow before it gets to the rubber diaphragm.
So while it shouldn't have a bearing on how the bike runs, personally I would open it up to see if something is stuck in there :thumbup:
Loud pipes don't save lives, knowing how to ride your bike will save your life.
tony.mon
Posts: 15963
Joined: Wed Jul 25, 2007 10:46 pm
Location: Norf Kent

Re: Vacuum Valve

Post by tony.mon »

I had problems when using a fuel pump, as the "suction" of the pump sucked the valve closed. This caused lots of rebuilding on the way to a Storm meet one time....

I fixed it by blocking the valve open by stuffing a screwed-up paperclip in the way..... A temporary fix that just somehow stayed there for ages.
It's not falling off, it's an upgrade opportunity.
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Beef
Posts: 288
Joined: Mon Jun 12, 2017 10:01 am
Location: Reading -ish

Re: Vacuum Valve

Post by Beef »

Thanks guys...... I’ll see how things go whether I get the time :thumbup:
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