Gas tank Filler

Mighty HD · March 4, 2005

Is there some type of a ball that makes the tank stop the fuel handle from pumping gas early?

Once it stops, I can slowly fill another $5-7 in the tank. That's quite a bit of gas. Sure I top it off every single time till the gas is up to the brim, but I was curious if I could modify anything.

rascal · March 4, 2005

I still get a kick out of watching the golf carts. reckon it's something to do with the pultion and eco nuts.

builderpaul · March 4, 2005

I always wondered about this also. Dealer says not to add fuel after the pump kicks off. Something about a charcoal canister getting overloaded and an evaprotive emmission check engine light being set. Does your check engine light ever come on or is it dealer BS?

LOve the carts also any more footage?

USA1Fan · March 4, 2005

I always wondered about this also. Dealer says not to add fuel after the pump kicks off. Something about a charcoal canister getting overloaded and an evaprotive emmission check engine light being set. Does your check engine light ever come on or is it dealer BS?
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I used to top-off the tank, then I heard that too. So now I always just let the pump kick off on its own. (probably less hassle filling up a bit more often than paying the dealer to repair some emissions related stuff)

Mighty HD · March 4, 2005

I top it off every time. It's under warranty now so if there's a problem they'll fix it.

Like I mentioned If I do not top it off, the gas gets sucked down I swear. When I do top it off, that extra 5-6 gallons of gas make a huge difference in my mileage.

I have never heard of the evap problem though...that's a new one to me.

Shooter_va · March 4, 2005

I have always been topping off and never had the check engine light come on.

dewfpo · March 4, 2005

There needs to be a certain % of air in the tank to allow for expansion of the fuel on hot days. The pump nozzle clicks off when there is sufficient backpressure coming out of the tank filler. It's designed that way.

If your going a long drive immediately after filling up, there is probably no problem with tinkling it in to the max since you will be using it up immediately.

Overfilling the tank then parking it on a hot day can cause the liquid gasoline to expand into the vent lines, filling the charcoal canister and all the lines and putting them under pressure. They are designed for vacuum and not much positive pressure. Air can be compressed, but not gasoline. You could blow a line off a nipple somewhere. Then you would get an evap code.

But worse, you could suck the raw fuel (from the now flooded canister) into the engine when the ECM opened up the purge valve. I'm not sure what would happen then.

DEWFPO