Iff you leave the swirl pot size at 2 Litres I would suggest a higher volume pump to feed the swirl pot on 400+ rwkw applications. An easier way to avoid the cost of an extra pump is to build a larger swirl pot. I suggest 3 litres as a minimum if you are retaining the standard in tank pump. Regards Spiko ← Thanks for the info mate - will heed the advice. 3 litres it is. ← OK guys, I don't get it - I have looked through the thread attached and seen the swirl pot that you've fitted. Whilst it looks like a premo job, it's just another fuel tank at the back of the car.... I thought the job of a swirl tank was to have an amount of fuel (say 3 litres) always handy to the injectors and with enough capacity so they can't run dry. A 3 litre aluminium tank at the back of the car seems to me a way around having to engineer the normal fuel tank and supply lines properly and hence deliver the goods. Wouldn't the best way of running a swirl pot be to have it mounted on the chassis rail near the firewall, real close to where the injector rail is? That way it doesn't need to travel up and down the length of the car..... The standard tank and higher capacity pump can feed the swirl pot, then that uses a motorsport pump to feed the injector rail.... I'm just thinking out loud here guys, of course Spiko and Rapid and others have done this in the real world - I'll be guided by your experience. ← A swirl pot wont supply more fuel! The addition of a second fuel pump will enable the system to flow a higher volume of fuel as the first pump supplies volume and the second supplies pressure. getting back to it the swirl pot is there for one reason and one only! To prevent the fuel pickup from running out of fuel due to high G forces from either accelleration or high cornering forces pushing fuel to the back front or sides away from your fuel pickup. This is why they are normally taller than wider. If you guys are having fuel supply issues on the dyno at higher revs the only reason a swirl pot will help you is because you are adding a second fuel pump giving you a higher flow rate, oh and if you guys are running a swirl pot in line using the original, walbro etc intank only you are band-aiding your problem