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There is an o-ring behind the pump that seals it to the engine. With time they can leak. However the most common leak is the crankshaft seal as it not only seals the crankshaft, as in a normal engine, but also seals oil pump pressure.
It really is a good idea to replace the crank seal and the oil pump o-ring when replacing the t-belt. Many times cam seals are replaced also but I've found that most of the oil thought to be coming from them is actually just carried away from the crank sprocket by the belt. I've been finding that the crank seal begins seeping around 30k miles and when removed is rock-hard.
Replacing the o-ring behind the pump is easy once the t-belt is removed. Once the pump is off it's an easy task to punch the crank seal out from the back. BE WARY - many people have been abused by dealers/shops that oversell, stating that an oil pump must be replaced because it is leaking/age/etc.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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