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  #1  
Old 23-05-2010, 10:04 AM
Murv Murv is offline
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Default Fuel leak problems

Following on from my introduction thread, I have a weird fuel leak on my bike (97 FV)
If I leave the bike overnight, with either the fuel tap on or, off there's a puddle of petrol under it by morning.
The fuel tap definately closes completely, so it can't be a problem with the carbs.
The tank is currently sat on top of our wheelie bins, full up, with the fuel tap turned off, and there's not a drop coming from anywhere. What the hell is going on, any thoughts?

There is a constant stream of vapour coming from the breather pipe, but I take it thats normal and anyway, there's no petrol coming out of it?
Is the breather on the right outlet (its on the rear as i face the tap) ? would it make a difference?

Here's a picture in case there's something obvious.

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Any help appreciated, the suns out and all I want to do is get out on my new bike!!!

Cheers,

Chris
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Old 23-05-2010, 11:05 AM
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spikeywan spikeywan is offline
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Do you leave the bike on the side stand or the centre stand?

At the moment you're only simulating it being on a centre stand.
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Old 23-05-2010, 11:21 AM
gixxerjay9181 gixxerjay9181 is offline
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sounds like carb diaphragms too me mate!

If no fuel leaks when the tap is closed then unless there is a hole in you tank somewhere (unlikely) then there isnt really anywhere else to lose it from as it wont normally drop through the breather unless you really overfill the tank!
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Old 23-05-2010, 12:31 PM
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Tazfiend Tazfiend is offline
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What about the fuel pump? I don't know how much it holds, but maybe it's losing fuel overnight?
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Old 23-05-2010, 05:31 PM
Murv Murv is offline
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Quote:
Originally Posted by spikeywan View Post
Do you leave the bike on the side stand or the centre stand?

At the moment you're only simulating it being on a centre stand.
You're quite right, I'm running another test overnight

Quote:
Originally Posted by gixxerjay9181 View Post
sounds like carb diaphragms too me mate!

If no fuel leaks when the tap is closed then unless there is a hole in you tank somewhere (unlikely) then there isnt really anywhere else to lose it from as it wont normally drop through the breather unless you really overfill the tank!
I really don't think it is though, with the tap shut, no fuel is making it as far as the carbs?

Quote:
Originally Posted by Tazfiend View Post
What about the fuel pump? I don't know how much it holds, but maybe it's losing fuel overnight?
Could be, hopefully I'll find out tomorrow morning.



I left it all day whilst we were out, came home and it's lost a few mls through the breather pipe.
I've drained the tank again ,and had a good look inside with a torch but there's no corrosion at all on the breather tube, it all looks pretty sound inside

So, I've put the tank back on the bike (not bolted) and left the bike on the side stand and I've put bottles under each of the overflows and left the side panels off so the fuel pump is clearly visible.
I ran it for a few minutes too to draw fuel through everything to replicate me coming back from a ride so, hopefully tomorrow morning, I'll find the source of it.
Although, if it is that breather, the only solution is a new tank isn't it?
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Old 23-05-2010, 06:47 PM
jeffa jeffa is offline
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hi murv, hope you received the fuel tap, however as you now have added more info can i suggest you check between the carbs. the fuel line goes from the tank into a :T: piece and 2 fuel lines then go in between carbs 1and2 and carbs 3and 4. there is plastic T piece that has O rings on them that supplies fuel to the carb bodies, when i rebuilt mine the o rings had distorted/perished and i was leaking fuel from between the carbs, i got new O rings from the guy in victoria station manchester [a top bloke] someone on here will tell you his name, i cant remember at the moment, ill see if i can find a photo of my carbs to post, hope this is of some use and makes sense, JEFFA
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Old 23-05-2010, 06:53 PM
jeffa jeffa is offline
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Hi murv, he is nrp-carbs.co.uk
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Old 23-05-2010, 07:22 PM
jeffa jeffa is offline
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Old 23-05-2010, 07:27 PM
jeffa jeffa is offline
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Hi murv, can you see the 2 brown connecting t pieces between 1-2 and 3-4 carbs, half way up the photo, these have the O rings on where they go into the carb bodies, run a cloth or tissue between the carbs and see if the leak is there,hope this helps, JEFFA
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Old 24-05-2010, 08:10 AM
Murv Murv is offline
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Hi Jeffa, much appreciated, thanks mate
The PO are redelivering the fuel tap tomorrow so I can try that too.

This morning there were no leaks anywhere, don't really see what else I can do apart from

I'll check the carbs next then, maybe it's the contents of the carbs and the fuel pump draining from the O rings as above.

Cheers,

Chris
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