Ingah Posted March 20, 2011 Posted March 20, 2011 My CB500's petrol tank is vacuum fed, but having taken it off to get to the carbs to investigate my petrol leak, i've noted that if i upend it or tilt it significantly, it pees out petrol?To my understanding, this should not happen.There's essentially 2 pipes coming off the bottom of the tank.One which leads to the fuel tap (it's NOT this one the petrol is coming out of), and the other which seems to end up going directly to the centre stand area via pipe (i.e. an overflow pipe, no stopper).My bike isn't stored on the flattest of ground, so i'm wondering if this might be it.This is a link to the parts diagram:http://www.hondaoriginalparts.com/hpl/i ... __1300.jpgIt's part number 34/35 i'm talking about (part 36 goes to the petrol tap). Quote
Hoover Posted March 20, 2011 Posted March 20, 2011 looks like a breather pipe, hard to see from the pic exactly where it comes from. are you tilting the tank with a full load of fuel, if so you will find the fuel overflow in the filler neck which is probably where the fuel is coming from. Quote
Ingah Posted March 21, 2011 Author Posted March 21, 2011 Yes it was nearly full.I believe it would be a fuel overflow, i assume this is normal behaviour then?A little surprised (isn't it rather dangerous for storage of tanks / if the bike goes over?), but thanks Quote
megawatt Posted March 21, 2011 Posted March 21, 2011 Your tank isn't vacuum fed mate, the fuel tap is ! The large bore pipe from the tap feeds the carbs only when the engine is running. There is a vacuum pipe from an inlet stub to the tap. The other tubes on the tank are a breather tube and an overflow. Keep the tank level or nearly empty before you remove it? Quote
Ingah Posted March 21, 2011 Author Posted March 21, 2011 Your tank isn't vacuum fed mate, the fuel tap is ! The large bore pipe from the tap feeds the carbs only when the engine is running. There is a vacuum pipe from an inlet stub to the tap. The other tubes on the tank are a breather tube and an overflow. Keep the tank level or nearly empty before you remove it? Thanks, a slight misunderstanding it seems then. Ah wells, this is why it's worth checking! Quote
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