Take a look at this thread all about adding Extended Run to a Champion Inverter/Generator
Champion Extended Run Fuel Option RV.NET thread - Basically, you will watch the youtube video by Pinellas that explains adding the option. Link is here:
Pinellas How To for Champion Extended Run kitThen you can do one of the following:
1) Order the kit from either Bottom Line Trading Company in Austin TX or from Supergen (cost roughly $200) or;
2) See the attachment in that thread which has the entire parts list if you want to order the pieces from Amazon and just do it your self (total cost about $75)
This option lets you use a standard portable marine tank like you would find being used on small outboard motors. I did the conversion and use my already owned Yamaha 6 gal. tank and bulb-type fuel hose. You can get as big a tank as your want. If you don't have a marine tank, just get one with a Yamaha connector from places like Amazon, Walmart or Academy. A 6-gal and hose should be about $70 or so.
A couple of final notes:
- You can't do this on the Dual-Fuel type Inverters because your added external tank will become active when you turn the fuel switch to the off position. In the propane enabled units, the off position switches to propane.
- You can choose to always just use the external tank and this leaves the onboard tank completely dry. Makes storage and winterize much easier. Or you can choose to use both tanks and switch to onboard while you take the external tank to the gas station for a refill.
- Note that the external option DOES NOT pump fuel into the onboard tank, the design uses a lawn-mower type vacuum pump that sends fuel to the carb. The onboard fuel tank is just a gravity feed type.