Fuel pressure regulators will often bleed fuel, but they are easy to check. You just pull the vacuum line off and if there is fuel inside the vacuum line or dripping out the regulator, it is bad.
You could also have a fuel injector dripping, or the fuel pump could be allowing pressure to bleed back into the tank. All very common.
If you have a way, you can hook a fuel pressure gauge on the rail, then install a shut off valve between rail and pump. Turn the key on until you have built fuel pressure, then shut the valve off. Come back the next morning and see if your rail still has pressure. If it does, you know its the fuel pump. If it doesn't, then it's an injector, or the regulator (just leave the vacuum hose off and see if there is a puddle near it).
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