Hi i purchase the generator before Maria hurricane, after few days used, i note the oil leak, came out at the bottom. Why happens this if the generator is band new.

SOURCE: Generator runs, but does not generate electricity

Reset / tickled? There are resistors and diodes in the end of the alternators rotor (the bit in the middle that spins) If these look ok visually then change the capacitor which is a barrel shaped object usually with 4 prongs on the end. Without a capacitor the genset will not produce a voltage.

SOURCE: Generator will not generate electricity.

I assume it is a hand start genset. The most common problem if it has been sat for a while is rust on the ignition timing flywheel. If you take the pullcord housing off (recoil) then you will see a big flywheel with what can only be described as a big forked prong with a couple of wires on it. This flywheel should be stainless steel and rusts when sat around for a while without use. Its job is to complete the circuit to the spark plug every time the flywheel passes the forked prong at a given spot on the flywheel, the faster the wheel turns the faster the spark hence the engine runs quicker. Clean the rust off with a releasing agent (wd 40) hey presto!!!!!!!!!!!

SOURCE: oil leaking from generator

Whose engine do you have? Briggs and Honda have websites where you can down load their manuals and replace the rear seal.

SOURCE: VALSI 5,500 WATT GENERATOR WILL NOT START

All generators need to be run once a month. All things from the tank to the and including the carb will get gummed up with dried out fuel. I have a whole house generator and a 5500 watt gen set on my motor home. I keep fresh fuel in the stand alone house generator in California in case of a bad earthquake. I drain the gas after every run and keep all vehicles full of fuel just in case. Run gen sets at least once a month or pay pay pay!!

SOURCE: oil change

There are two 14mm bolts on both sides (lower) of the motor. Unscrew one or both and drain the oil....Replace with sae 30 or 10w30 oil and should take almost a quart. (Put the bolts back in and tork slightly.) Check oil level.