Originally Posted by
stevieturbo
And returning to the swirl pot results in hotter fuel.
There is no reason a properly designed setup cannot return all fuel to the main tank. Although the easy option is returning to the swirl tank.
Although surely if this car is a race car spec of any kind with a custom fuel tank there cant be a need for any external swirl tank ?
Isnt that part of the reason you'd design a custom fuel tank in the first place ?
the heat in the fuel isn't a major problem and many external swirl pots are piped this way, you can get fuel coolers though, even my diesel has one for the return pipe.
the reason for the return to pot is the fuel not needed from the rail isn't dumped into the tank just to be pumped up again (which also heats the fuel in the tank like all other systems).
an engine rarely requires max fuel all the time, so you can spec the lift pump below the max needed, but better to go higher really.
consider a facet red top interrupter flows 37GPH, so 166LPH, 600cc injectors x4 flow 144LPH. so a facet will flow enough at max flow for four 600cc injectors just fine.