[Cobra #3170]

I made a surge tank out of an aluminum C02 welding cylinder (small) installed upright in the boot. I tried several configurations and the one that worked best with fuel injection was plumbed as follows. I used a Holley blue pump to feed a bung that I installed on the side of the tank near the top. I feed my Bosch fuel injection pump from a bung I installed near the bottom of the tank. I feed the returned fuel from the EFI regulator at the top of the tank. I also installed a 5 psi check valve at the top of the tank that routes fuel back to the main tank on the opposite side from the fuel pick up. This set up insures that the Bosch pump always has at least 5 psi of pressure feeding it and that the C02 cylinder is always full and under pressure. I have an electrical bypass on the Holley pump so that I can drain the main fuel tank by running that pump and connecting a drain hose to the C02 cylinder where the check valve is normally connected. This set up has worked perfectly under high cornering loads. I initially returned fuel from the regulator right to the tank but found that it would occasionally get air and cause a stumble because the tank could run out of fuel on a long LH sweeper, so I now return fuel directly to the C02 bottle.
My tank is baffled and I have tried duel pick ups and even a swinging pick up but this is the only set up that worked perfectly even with only a gallon or two in the tank.