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post #1 of 6 (permalink) Old 11-17-2013, 01:26 PM Thread Starter
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Tank to carb problem?

For some reason, fuel won't flow out of my gas tank. I tried disconnecting the fuel line from the carb, and sucking on it, but no gas will flow. I the. Removed the petcock, and now the gas will pour out of that hole in the tank, so I know there isn't a clog in the tank. The petcock seems to be in good condition, and I ran water through it and I don't think it's clogged. When I tried to suck the fuel out, I was sucking on the hose that has the filter on it (I tried sucking with an without the filter, by the way). Is this the correct hose to siphon with? Sorry I'm such a newb. Thanks in advance.
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post #2 of 6 (permalink) Old 11-17-2013, 01:34 PM
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Originally Posted by MrBlondyable View Post
For some reason, fuel won't flow out of my gas tank. I tried disconnecting the fuel line from the carb, and sucking on it, but no gas will flow. I the. Removed the petcock, and now the gas will pour out of that hole in the tank, so I know there isn't a clog in the tank. The petcock seems to be in good condition, and I ran water through it and I don't think it's clogged. When I tried to suck the fuel out, I was sucking on the hose that has the filter on it (I tried sucking with an without the filter, by the way). Is this the correct hose to siphon with? Sorry I'm such a newb. Thanks in advance.
Three tubes attach to our Petcock's. Two fuel, one each carb. the 3rd (middle) is the vacuum which is connected to the leftside carb vacuum port via 3/16"tubing .
Hence, petcock is vacuum operated. Some have connected a Turkey Baster to apply vacuum for fuel flow/vacuum tests.
hope this helps

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 11-17-2013 at 01:38 PM.
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post #3 of 6 (permalink) Old 11-17-2013, 01:41 PM
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Yep, sounds like you didn't apply vacuum to the center port on the petcock. It connects to the left carb vacuum port.

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post #4 of 6 (permalink) Old 11-17-2013, 01:46 PM Thread Starter
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Thanks. Are all Vulcan 750s vaccum fed? My petcock has ON, OFF, and RES. I thought that only gravity fed had an OFF position?
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post #5 of 6 (permalink) Old 11-17-2013, 01:49 PM
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Quote:
Originally Posted by MrBlondyable View Post
Thanks. Are all Vulcan 750s vaccum fed? My petcock has ON, OFF, and RES. I thought that only gravity fed had an OFF position?
Yes, and mine has the same.

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #6 of 6 (permalink) Old 11-17-2013, 01:54 PM
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If it is the original petcock it is vacuum if it was replaced with one from another bike it might not be

If your petcock is not leaking thru the vacuum diaphram then you never have to turn the valve to off

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