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I own a Coleman 7kw generator. It came with a few features that made it attractive to me. First is a filtered, pressurized oil system, second, a fuel pump and finally an electric starter. Otherwise it's a conventional air cooled small gasoline powered generator. The oil system is a plus for long engine life and the fuel pump makes it practical to draw fuel from an external tank without relying on gravity. I've modified the generator with a fuel trap bowl and a transfer valve so fuel can be taken from either the on board 5 gallon tank or an external 30 gallon tank. The external tank is on wheels and can be located up to 20 feet from the generator. The trap bowl will catch any water and sediment before it can go upstream to the fuel filter. I replaced the built in muffler with an adapter to standard 2 inch exhaust plumbing. A length of 2 inch flex pipe connects to a conventional auto muffler for quieter running. It also is part of the solution to keeping the machine cool while it runs in an outdoor enclosure since the muffler will be outside the building. I added a metal baffle to keep hot cylinder cooling air from blowing over the generator. A couple of over-sized wheels makes moving the generator a lot easier.
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