fatshoutybloke Posted August 7, 2018 Share Posted August 7, 2018 Hi all. Got a problem which is puzzling me, in the heatwave we're having here in the UK at the moment (I know lots of you across the pond will be amused at the thought of consistent high-20s/low-30s C being a heatwave but we're not used to it in our little islands) my bike has started to leave a film of fuel on top of the airbox when it's hot. No evidence of leakage when the bike's just standing but when I return from a ride and leave the bike for a while, if I lift the tank the foam stuck to the underside is wet and so is the top of the plastic air filter box. I've no idea where it's coming from. I thought it might be the heat building up pressure in the tank but I've checked the breather - blown down the pipe OK, fitted a spare pipe and blown up into the tank OK and out with the cap open. Also checked the drain hose just in case, it drains from the filler cap surround and out onto the ground as it should. I wipe it down, leave the tank propped up and it dries out until the next time. Any ideas? Link to comment Share on other sites More sharing options...
Member Contributer Grum Posted August 7, 2018 Member Contributer Share Posted August 7, 2018 Check the 6 fuel pump mounting nuts for even tightness, possible fuel pump seal leak issue see page 7-9 in the Service Manual. Check there's no weeping from the quick disconnect coupling. Are you getting any high positive pressure build up in your tank? Note - ALWAYS When lowering your tank make sure you take up the slack of the breather hose by gently pulling on the small to big breather hose connector (right hand side) as you lower the tank. Very easy to kink, crush, block the breather on the 8gen, leading to tank damage. Good luck let's know what you find, you need to get this sorted ASAP. Cheers. Link to comment Share on other sites More sharing options...
fatshoutybloke Posted August 8, 2018 Author Share Posted August 8, 2018 Hi Grum, thanks for the reply. I've checked everything back there, the pump and tubes at the back of the tank are all dry. I'm re-checking the breathers... Link to comment Share on other sites More sharing options...
Member Contributer Thumbs Posted August 8, 2018 Member Contributer Share Posted August 8, 2018 Are you sure it's fuel? UV lamp and leak dye for petrol, £15 https://www.ebay.co.uk/itm/UV-Dye-Torch-Kit-Leak-Detection-Dye-For-Oil-Fuel-Petrol-Diesel-Leaks-RLD4-/230754744531?ul_ref=http%3A%2F%2Frover.ebay.com%2Frover%2F1%2F710-53481-19255-0%2F1%3Ficep_ff3%3D2%26pub%3D5574933636%26toolid%3D10001%26campid%3D5337687316%26customid%3D%26mpre%3Dhttps%253A%252F%252Fwww%252Eebay%252Eco%252Euk%252Fitm%252FUV-Dye-Torch-Kit-Leak-Detection-Dye-For-Oil-Fuel-Petrol-Diesel-Leaks-RLD4-%252F230754744531%26srcrot%3D710-53481-19255-0%26rvr_id%3D1625105891165%26rvr_ts%3D1a84678a1650aca49c30541bffee41f5&ul_noapp=true Link to comment Share on other sites More sharing options...
Member Contributer fink Posted August 8, 2018 Member Contributer Share Posted August 8, 2018 Are you sure its not condensation? Haven't noticed anything on mine. Link to comment Share on other sites More sharing options...
Member Contributer Thumbs Posted August 9, 2018 Member Contributer Share Posted August 9, 2018 That was my first thought too Fink, hot engine, cool fuel tank, etc If it was petrol it would smell it first or is that what made you look? Link to comment Share on other sites More sharing options...
fatshoutybloke Posted August 15, 2018 Author Share Posted August 15, 2018 Definitely fuel, smells very strongly of petrol but I'm not going to try igniting it to make sure! Thumbs, yes, it was the smell that made me go looking under the tank. Link to comment Share on other sites More sharing options...
Member Contributer Thumbs Posted August 15, 2018 Member Contributer Share Posted August 15, 2018 Is it any better now we've got our normal summer back? Link to comment Share on other sites More sharing options...
fatshoutybloke Posted August 15, 2018 Author Share Posted August 15, 2018 Yes, hasn't happened again... yet. Link to comment Share on other sites More sharing options...
Auspanglish Posted August 16, 2018 Share Posted August 16, 2018 Trick: Of course you shouldn't go near it with a naked flame. Paper kitchen towel, serviette, tissue, mop it up, step away from the bike and see if the tissue burns (somewhere safe). If it's condensation it will be obviously hard to set fire to it. Link to comment Share on other sites More sharing options...
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