leaking petrol under tank

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Knobby69
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Joined: Sat Jun 21, 2014 2:14 pm

leaking petrol under tank

Post by Knobby69 »

I have just started my VTR after what now must be over 4 years under a sheet. 4 or 5 stabs at the starter and it started to fire, but immediatIey started leaking Iots of petrol from under the tank.

I think that I am right in saying that there no normaI petroI tap, but one that works by vacuum when the engine is started. I cannot see what is happening with the tank on, but with it off there wiII no petroI suppIy to go any anywhere. I am sure it is something easy, but not to me at the moment!
A big thank you for those that take time over this issue.

NigeI
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freeridenick
Posts: 1450
Joined: Fri May 23, 2014 12:30 pm
Location: Derbyshire

Re: leaking petrol under tank

Post by freeridenick »

Perished fuel lines, perished float bowl seals, perished anything. Standing for that long I'd start with all the rubber bits and go from there. If they're all OK. Strip the carbs and give them a damn good clean. Stuck float valves could bee the problem.

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sirch345
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Location: The West Country.

Re: leaking petrol under tank

Post by sirch345 »

Knobby69 wrote: Thu Sep 22, 2022 2:23 pm I have just started my VTR after what now must be over 4 years under a sheet. 4 or 5 stabs at the starter and it started to fire, but immediatIey started leaking Iots of petrol from under the tank.

I think that I am right in saying that there no normaI petroI tap, but one that works by vacuum when the engine is started. I cannot see what is happening with the tank on, but with it off there wiII no petroI suppIy to go any anywhere. I am sure it is something easy, but not to me at the moment!
A big thank you for those that take time over this issue.

NigeI
That is correct regarding the petrol tap. It could be that the diagram has failed in the petcock, it has a outlet spout facing downwards on the tap at the rear of it. You can check that with the tank still fitted if you pull the fixing bolt out at the rear of the tank and raise it slightly, assuming you have the earlier version bike (16ltr fuel tank). Otherwise the petcock is mounted on the frame not the tank. There is a special tool in the tool kit if you have one to support the tank, but be careful as it's not the best support.

Apart from that as Nick has already said,

Chris.
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xeris
Posts: 70
Joined: Sat Jan 11, 2014 4:05 pm
Location: Bisbee, AZ

Re: leaking petrol under tank

Post by xeris »

Another possibility, though less likely, is the o-ring that seals the fuel level sending unit. It's another rubber bit.
"The future is uncertain and the end is always near"
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