Help me: External marine tank on Champion 2000 watt gen.

This may be a stupid suggestion but instead of remaking the gap of the original cap and running the extra gas into it, ( besides the extra capacity) wouldn't be easier to just put a larger tank on top and run a line directly to the carb?

why, it doesn't connect to the carb
the carb is still connected to the OEM tank, and will never have more than the Normal pressure of a full tank of gas

only a system with an ADD ON pump will independently create pressure
and the small engine vacuum pumps on the market are preset at the correct pressure and cannot be changed

Isn't there some concern of a larger higher mounted tank creating too much pressure on the carb?

Fluid will find level, so the extra tank would need to be level with the tank mounted on the gen set.
If the extra tank is level with the mounted one & both filler caps are of the same height, you could run the hose from the extra tank, into a T in the hose coming off of the mounted tank & gas would flow from both tanks.
If the extra tank was to be lower than the tank mounted on the gen set, if the tank mounted on the gen set had the filler cap sealed, then once fuel had stated to be used from the mounted tank, a vacumm would be created & the fuel from the extra tank be pulled into the on gen set mounted tank. The extra tank couldnt be very much lower than the on gen set mounted tank, because that vacumm will not be very strong to pull the fuel from the extra tank.
Neil

If my memory serves, in the champion 3000 watt, 1000+ page there is an extended run using a 12 volt fuel pump with a pressure regular but I believe it was directly connected to the carb not to the tank.

The whole issue of the honda's having a vacuum operated fuel pump is why you can draw fuel from an external tank but none of the other vendors (Yamaha, Champion, Kipor) have/had a fuel pump so a gravity feed was the only solution.

In addition to the gravity feed on a marine tank (which should work if it's slightly above - it will siphon the contents of the marine tank into your primary generator tank - you need to be careful how high above the other tank you mount it. As you increase the height it will increase the pressure in the tank and ultimately into the carb.

You need to check and see if your cap is vented or not. If it's got a vent then at some point the extended run tank will exceed the volume of the primary and leak out and possibly cause a fire.

I've been to the this movie myself and saw the ending. It's one of the reasons I moved from a Yamaha to a Honda because of the pump.

Oh, one more thing. You can purchase the honda vacuum pump (it's made by Mikuni) and run it off your Champion directly and create your own fuel pump to move the contents of the external tank into the primary.

You can look at this http://www.northerntool.com/shop/tools/product_200408951_200408951

MrWizard wrote:
i don't have the web link
but i think 'supergen products'
has an extended run system available

i'm guessing that if you modifed the gas cap
and started with a full on board tank, an elevated gravity feed might
move fuel from the elevated tank to the onboard tank

a primer bulb, and filling the line before attaching to the genset, would decrease air and internal pressure

Wise Sales has an extended run fuel tank with a choice of one or two feed lines. Approximately $165.00.

Once primed, it should flow without trouble if the bottom of the tank is at least as high as the original tank.

i don't have the web link
but i think 'supergen products'
has an extended run system available

i'm guessing that if you modifed the gas cap
and started with a full on board tank, an elevated gravity feed might
move fuel from the elevated tank to the onboard tank

a primer bulb, and filling the line before attaching to the genset, would decrease air and internal pressure

all I can tell you is I tried it on a Honda and many have said it works but I never could get the gas to flow, yes I know this is for your gen and not my gen but I wish I knew the secret to get the gas to flow. I finally broke down and put a priming bulb in and just gave it a pump or two to keep the gen filled up so it would keep running.