Mark Seymour - Reference and Resources

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Ginetta G40 Fuel & Tank (Description)

Fuel Tank

The fuel tank is a sealed FIA-specification fuel cell, much like a bag within an aluminium box. The capacity is approximately 45 litres, and I have found that running a tank to what you think is empty will take 35 litres to fill.

The fuel tank is located behind the driver and can only be accessed by removing the panel in the boot. The fuel filler pipe, between the tank and the filler nozzle, can only be replaced by removing the rear window of the car. If you buy a new car, make sure that the seals are good on the fuel pipe into the tank. The pipe on my car was too short and under strain, so it needed replacing.

The pump and fuel filter are inside the tank as far as I know. These can be accessed from the top of the tank, after removing the panel in the boot.

See this link for more about FIA fuel cells.

Fuel Measurement

The dashboard fuel gauge in the G40 is not reliable. I find that when the tank is full, the gauge registers 3/4 full for the first 20 minutes of driving. After about 30 1-mile laps on track, or one hour of road driving the fuel gauge registers half full. After that, it registers quarter full or close to empty.

To be accurate, you should use a pump to empty the tank and then add as much fuel as you need for the intended laps or race. Team racers will only add as much fuel as they need for the session, as fuel is heavy (approx 1 KG per litre). There is a fuel valve in the engine bay to attach a fuel pump (available from Ginetta for approx. £150) for emptying the system to zero.

If you don't have a fuel pump or accurate method of measuring, I find that the following approximation works: start a 20-minute qualifying session or race on a half-full tank and it will last. For the next, similar session, a top-up of 10 litres will be sufficient. In other words, you'll burn about 10 litres per 20 minutes, but you need a buffer, to avoid running out. I would always start on half a tank and top up 10 or 15 litres after about 20-30 one-mile laps.

Fuel

The Zetec engine will run on 95 or 98 fuel, just the same as a road car. I don't find any difference in performance running 95 or 98.