Quote:
Originally Posted by boxhead
I agree with you there, I initialy only set it up that way wanting to be able to get every last drop of fuel from the tank, and I have similar issues as Gregg is describing in hi speed cornering and accelerating when the tank is below about 1/4 full, I was thinking that by returning the fuel to the swirl pot then atleast it is not getting sloshed around in the tank and missing the intank pick up.
I figured I was not chassing every single last bit of HP so the small loss due to warm fuel did not bother me.
All feed and return lines to and from surge tank are the same size, being 8mm ID
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The thing with returning fuel to the surge tank is that under full throttle or anything apart from idle is that less fuel is returned to the tank so in effect you will get little gain from it, at idle the engine is using less fuel and the return volume is at its highest and the lift pump should not be having any troubl supply the tank. The problem I have found with most surge tanks I have seen is that they usually have a -6 or -8 supply into them from the lift pump and the same size -6 or -8 as the return to the tank and then the have a -6 or -8 return into the surge tank for the returned fuel, so in effect you have double the supply into the tank but only half the area for returning to the tank. This in effect especially at idle will create pressurization of the surge tank and will apply pressure to the back of the regulator which can cause a richer than normal idle.