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The only thing I would suggest is to not return your fuel to the surge tank but return it back to the tank. The reasons for this is that you are retuning hot unused fuel back to the surge tank and then sending it back to the engine for consumption or recirculating. If you think that your lift pump is not capable of maintaining a full surge tank either your tank is to small or your lift pump is to small. The advertised flow ratings for most pumps is in US gallons (3.75 litres) per hour at what ever restriction required to achieve a rated pressure, when you remove the restriction and the pump is in free flow the volume is greatly increased, Make sure that the surge tank has the same size return as supply.