Rb20 Coolent Leak

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my 20 keeps leaking where the hose meets the water pump, it spits out a fair bit of coolent but it only happen a couple of seconds after the car turns off, i have had the hose off but it all looks ok, the clamp is not the best type of clamp but it is doing the job.

i am just a bit confused why it only releases when it turns off, could this just be an over flow issue, or is it something worse. really frustrating any help would be wicked cheers

[SNOQPY]

replace the clamp with a jet clamp and get a thicker hose. it spills out after the engine stops cause it builds up pressure

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cheers mate all fixed there was a small leak in the pipe and one just behind it as well, just out of curiosity why does it build up pressure when you turn the car off?