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> to combat sloshing, add sponges

I love this sort of simple yet effective solution.

It is commonly used in racing and off road applications to prevent sudden starvation of the fuel pump in rough situations.

Why not use baffles?

The porous structure of sponges effectively acts like a baffle.

Basically, this. ^

I fitted an off road style fuel tank on a truck I had, but I opted for the version without sponges/baffles. It would try to stall when stopping on a low tank.

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