Manky Monkey Motors

Technical Section => Bike Tech => Topic started by: Firery Fred on July 20, 2014, 07:39:40 AM



Title: Petrol tank
Post by: Firery Fred on July 20, 2014, 07:39:40 AM
There's  a small (5mm) vent pipe under this tank that I would like to blank off.1) I need to do this as we have moved the cap position and the angle it sits at , and 2)Will it be ok as long as I use a vented cap , cheers , Fred


Title: Re: Petrol tank
Post by: Firery Fred on July 20, 2014, 03:09:52 PM
Oh , nearly forgot...how do I tell if the cap I have is vented?


Title: Re: Petrol tank
Post by: Olds on July 20, 2014, 07:25:46 PM
Should be fine blocked off with a vented cap but it is possible to get a little fuel loss on uneven roads, so be careful on how far you fill the tank.
One problem you may have is fuel starvation if the venting is not adequate and you are running a very thirst motor.
Traditional cam lock caps will have a small hole underneath near the centre and another just outside the rubber sealing gasket.
My Harley vented twist cap has a valve built into the centre that allows air in freely but not out. Hence the use of the vent/overfill pipe.
The non vented cap is plain.


Title: Re: Petrol tank
Post by: Firery Fred on July 21, 2014, 07:00:11 PM
THANKS PEEPS...monkeys to the rescue again  ;D