 Exxon Mobil Corp has restored crude output at its nascent project off Guyanas coast after addressing problems with gas reinjection equipment, the South American countrys environmental regulator said on Friday. Output at the offshore Liza field, which Exxon operates in a consortium with Hess Corp and CNOOC Ltd has been restored to between 80,000-90,000 barrels per day bpd, after falling to between 25,000-30,000 bpd, according to Vincent Adams, head of Guyanas Environmental Protection Agency. Exxon had slashed output to avoid excessive flaring of natural gas produced alongside crude oil, as the equipment issues prevented it from reinjecting sufficient quantities of the gas back into the reservoir. 