You must have one or more fuel injectors stuck open running fuel constantly. Pull out the fuel injectors and see if one or more are stuck open. If it's just one, probably that one is faulty. If fuel runs out of all of them, it's probably a fuel injector control circuit problem, like a short to ground in the control circuit.
Use extreme care in dealing with fuel problems, there's a fire hazard present when fuel is leaking. Keep a fire extinguisher handy.
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