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Take a sample out and check following;

Colour - Petrol is almost clear, diesel is more yellowy

Smell - Diesel and Petrol both have distinctively different smells, only way is if you get a sample of either as a reference

Flash point - Petrol has a much lower flash point so will burn if ignited whereas diesel wont. If you take a very small sample and under safe and controlled circumstances try to ignite with a match if burns is petrol if not diesel

Hope this helps

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Q: How can you test if petrol or diesel is in spare fuel tank?
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