Gas leaking from intake

Energy One

WT_Wizard

New Member
2008 Mastiff EFI vance & hines big radius 2 into 1 cone air filter.
3500 miles
I smell gas every once and a while but can not find a leak. Just yesterday I warmed the bike up leaving work @ 4:30 in the morning. It was 55 degrees out side and I could smell gas bad. No leaks. Rode for 8 miles. stopped at a red light, the best I could tell, gas was pouring out of the air filter and on to the motor and pipes. Made it home ( a block away). Checked it the next morning OK no leaks no drips nothing. Warmed it up and rode still nothing.
Any body got any Ideas????????????
Thanks Wizard
 

Gas Man

Cool isn't cheap
Calendar Participant
Are you sure it is gas and not oil residue coming from your rear breather?? Just making sure.

Beyond that, it could be something wierd with the EFI. Neil is our more known WFI junky here beyond some of the factory guys floating around.
 

hoat

Well-Known Member
I know most efi have supply and return lines and there is no float or overfull tube. maybe it was over full in the tank and leaking out that way. Dont know those efi blues on a big dog but I have them on the 2000 road glide
 

Nomad2day

Longhair Redneck Geek
The fuel tank only has a supply line going to the intake that is pressurized from the fuel pump. It has one bolt that holds it in. It only has a O ring on the nipple that goes into the intake. If it is nicked which can happen if you push the line through it, it can and will spray gas out and it will run down the motor and run off in the area where the heads mount to the cylinder. I have purchased this O ring at a Harley shop so I know it can happen..:D With your air filter on you can't tell but it connects behind the upper engine mount. Are you sure you throttle is closing all the way? I have heard my stepper motor at night due to the throttle not being fully closed. I thought it was the fuel pump at first but it was not. You also have a crossover line on the front side of the tank underneath you need to check, but check the supply line connector under the tank to make sure it is tight and fuel is not running down the line. You line also is routed tight to the cylinder head and make sure it is not rubbing through but it would spray everywhere. If all else fails, on the newer tanks underneath there is a pressure valve kinda like a valve stem to check and the fuel pump bolts into one side of the tank which could leak fuel also through the mounting surface.
Let us know what you find...
Neil
 
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