Hi guys,

about to fit a swirl pot and second fuel pump set-up to cure fuel starvation through left hand bends, the problem is the return feed from the swirl pot back to the fuel tank-

I have a standard tank with no return pipe- so wondering how to return the fuel to the tank. can I use the breather pipe inlet? by either tapping in a y piece into the breather pipe, or removing the breather pipe?

Les

Well yes and no,

You can use the breather as a return line but it'll probably be noisy and maybe even produce foam inside the tank with fuel dropping into the tank from height.

also if you don't have a breather on the main tank you'll get trouble from that, + fuel will probably be pushed out of the breatherpipe instead of it flowing back to the tank, because the lack of a breather, which you by then have effectlivly blocked by fuel returning to the tank or exiting the breatherpipe.

You can however make up a new breatherpipe quite easily if you have a rubber piece inbetween the fillerneck and the tank itself. once you have done that you can use the original breather pipe as a return,
but it's best to have the returnpipe exit at the bottom side of the tank, to prevent foam being made in the tank.

Grtz Thomas

thanks,

So not ideal but ok to use the breather pipe as a return to the tank- as long as I make up another breather pipe, which could be tapped into the filler neck?

Les

Yep, that's fine. Given that you are including a swirl pot any frothing of the fuel will get dealt with there (that's what the 'swirl' is for).

do you need a breather on a carbed car?

if so can you get safe ones so that if you flip petrol wont gush out thru the filter?

cheers

Yes thats what you normaly put in the breather pipe/line, a sort of one way valve.

and yes you need a return line in any case whether it's carbd or injected when using a anti surge tank with it's own low presure pump to get the fuel from the main tank in it. otherwise you'll presurise the small tank, you don't want that.

grtz Thomas

sorry to raise all this again!!

I have fitted the swirl pot setup. works fine, no breather problems, however it
hasnt cured the starvation problem on left handers on the track!!!

so all that work for nothing st present. anyone got any pictures of their setup?

i am wondering if the positioning of the fuel pumps and lines has created another problem? this is a real pain in the neck......