Fuel Tank Breather

[Guest Oscarborder]

Just fitted a stainless steel tank and about to fit a breather pipe into it. Can the breather pipe be fitted so that it terminates 50 mm below the filler cap with a bend pointing back to the tank?

[Snapperpaul]

If you fill the tank it may push fuel out or syphonif you terminate breather below filler you should fit a roll over valve without inverted U tube

If you then fill the tank the tank won't breath until fuel level is below ball valve

[Guest Ian & Carole]

Like Paul says your breather pipe MUST be above the filler pipe or higher.

[Guest Oscarborder]

Thank you to both Snapperpaul and Ian & Carol for their most useful information which I will use when I return to the build next week.

Regards

Gerry

[Al Milton]

Hi Gerry, you can get the roll over vent valves (as Snapperpaul recommends) easily enough from E Bay.

 

As suggested by Mick (Mowerman) in a post a little while ago, to minimise the slow filling issue sometimes experienced, it might be worth fitting 2 breathers allowing the tank to vent quicker when you are filling.

It'll be easier at your stage of build than retro fit.

 

Al

[Guest mower man]

It works!! mowerman

[Snapperpaul]

I fitted a roll over valve to filler neck and a one way valve to swirl pot this makes filling soo much better and I don't get a hissss when I take the filler cap off

[Guest danny_samb]

How do you dit the roll over valve to the filler neck, can I fit it in the return back to the tank via a t-piece, return to the t-peice, 1 end to the roll over then the other back to the tank, just mount the rollover vertical and connect to the chasis higher than the return