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I have a Husqavarna LGT2554 Riding Mower, last year I took it to a shop to let them do a tune up, it came back and I noticed that oil is leaking out from the valve cover that the rubber hose connect to the fuel pump. I have since replaced the valve cover and new rubber hose with clamp, the leak is now less than before but it still does when I do a full cut on my one acre lawn, does anyone know what the problem is? the engine is SV730 Courage twin.

Thanks

That is one of the classic signs of a blown head gasket.
Run the engine for a few minutes turn it off then remove the dip stick tube.
If smoke comes out of the tube then you have a blown head gasket.
If it seems to release pressure but no smoke then the breather is blocked

Let us know what you find.