EVO All Evo Model Discussion

Vacuum hose routing?

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Old May 3, 2021 | 06:13 PM
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Default Vacuum hose routing?

My 99 Fatboy had the vacuum operated petcock w/ the kehein carb. I just cleaned and replaced gaskets on the carb and put a new air cleaner.

My question is... the vacuum hose runs from the petcock to the T connection. From the T to the carb. The third line from the T is what I can't find a connection for. If I plug it the bike starts. If I leave it open the bike will not.

Does anyone know where the third line goes? There's no info in the service manual about it.

Thanks in advance for any help..
Greg
 
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Old May 3, 2021 | 06:15 PM
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Voes.
 
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Old May 3, 2021 | 06:44 PM
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O

Ok. I may have jumped the gun. It appears that there are actually two T connections. Both circled. The first one (blue ljne) runs into what I think is the VOES. The second one (red line) currently runs back behind the engine. That's the one that I can't find a connection for.
Am I just going about this all wrong?
 
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Old May 3, 2021 | 07:28 PM
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While I'm not familiar with your exact motor, I believe it has only the vacuum petcock and VOES. You should therefore have a line from the carb (or intake manifold) to a T and from the T, 2 lines, one to the VOES and one to the petcock, which you should replace with a Pingle anyway. Who knows what a DPO did to the vacuum system.
 
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Old May 3, 2021 | 08:12 PM
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I've uncovered a lot of things the PO did. So you're not wrong on that.
 
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Old May 3, 2021 | 08:27 PM
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I think you have the hoses mixed up, one T, vacuum from carb or intake manifold, petcock and voes switch, the other T I think is suppose to be vent hoses, maybe trans vent, your bike has a gas tank vent hose, I don't know why that they may have the vents T together, but I've seen stranger things
 
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Old May 3, 2021 | 08:33 PM
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Just take one of the Ts and run a hose from the T to carb, from T to petcock, from T to VOES switch, leave the rest of the hoses, and the bike should run, like I said I think the other hoses are vents
 
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Old May 3, 2021 | 08:52 PM
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I thought the last hose was a vent as well but the only way I can get the motor to turn over is to plug it.
it's hard to see in the picture but the two T's are connected to each other..
 
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Old May 3, 2021 | 10:11 PM
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Some pictures with the right tank removed. Pretty sure I'm missing something.

 
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Old May 4, 2021 | 04:30 AM
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Kuryakyn hyper charger air filter gizmo?

There was/is an aftermarket air filter that has a butterfly mechanism that opens with vacuum. It's just a gadget/gizmo. I wonder if it was there before you bought the bike and the previous owner just took it off and plugged 9or did not plug) the vacuum line.

https://www.kuryakyn.com/products/15...d-hypercharger
 
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