Cash Tank

Achei interessante esse texto em inglês que retirei de um site, que vem de encontro ao que eu estou pensando em fazer que é o Surge Tank (ou Cash Tank).. que consiste em um pequeno reservatório na frente do carro, com capacidade baixa, digamos um litro de combustível para não deixar que a bomba puxe ar quando o carro fizer algum movimento que faça o combustível do tanque principal mexer demais e sair do alcance da bomba.

Fuel Tank

The main factor to consider when converting from carburettors to injection is the fuel delivery system. The fuel tank is the first link in the fuel delivery chain. A normal unbaffled fuel tank is not suitable for an injected engine since under the influence of the various ‘G’ forces encountered in a moving vehicle, the fuel can move away from the tank pickup and cause the fuel pump to suck air. With a carburettor based system the carb has a float chamber from which the fuel can be drawn if the pump supply dries up. An injection system on the other hand has no such reservoir; if the supply of fuel to the pump dries up then the engine will cutout due to lack of fuel. This is exacerbated by the fact that the fuel pump runs all the time with an injection system with surplus fuel being diverted back to the tank via the pressure regulator.

There are two ways of counteracting this fuel starvation. One way is to compartmentalise the tank, I.E. build a compartment around the pumps outlet which is fluid tight and use one way valves that allow fuel in to the compartment but not out again, this keeps the fuel in the area of the pump outlet. This can be supplemented by fitting a small conventional auxiliary pump that can shunt fuel from the opposite end of the tank to counteract the affects of fuel surge. The other way is to use a fuel reservoir or surge-pot that holds a litre or so of fuel that supplies the pump regardless of the fuel situation in the tank. This is fed by a small pump from the tank or by gravity and is sufficient for several seconds of engine activity. Ensuring that the fuel returned from the pressure regulator is directed at the pump outlet can also minimise the effects of surge in the fuel tank.

You cannot convert to injection and not pay attention to your fuel tank; it absolutely must be baffled and compartmentalised, or fitted with a surge-pot."