Hi Alga, I assume that's where the one way valve comes in somehow. The pump lives in the boot, it is fed from one of 2 petrol tanks. The outlet from the pump goes to this valve, the outlet from the valve runs to the front of the car where this massive (about 1/4 litre) filter sits. There is no baffling in the tank and no swirl pot that I can see inside the tank. They do slope so maybe the fact that the pickup is right at the bottom of the lowest point is sufficient to ensure continuous feed unless the tank is really low. The only reason I can think of to have such a big filter is to provide a small anti surge reservoir. It can't be for flow rate as it's only about a 5mm bore for the inlet and outlet.
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