Official Toyota Response
- Thread starter Koz
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sharp4runr
New member
I didn't need to ask Toyota to know that it wasn't a good idea.
Oh well, i will just blame my fiance if something does happen!
Thai
Elite Member
Here's more info regarding this practice:
http://www.epa.gov/donttopoff/
I also found these helpful hints while googling:
http://www.toyota-4runner.org/showthread.php?threadid=21266
http://www.epa.gov/donttopoff/
I also found these helpful hints while googling:
http://www.toyota-4runner.org/showthread.php?threadid=21266
Jeff Kleb
New member
I really have no reason for doing it, but I typically "top off" to the nearest fifty cents; and have done that for years and years. Perhaps it was to make it easier to avoid pocket change when I used to pay cash for my fuel, I don't know.
Pretty silly nowadays, as I always use my debit card and pay at the pump. Nothing like pulling up, swiping my card, filling the tank and driving off so quickly.
:awais:
I have been driving for 25 years, and have yet to experience any problems from 'topping off' the tank of every car/truck I have owned. Old habits die hard, so I expect that I'll continue such a useless procedure.
:bash:
Uneek
Super Moderator
I'm breaking my habit slowly. Instead of adding another half gallon of fuel after it cuts off, I just grab the handle once more and call it done. Eventually, I'll just return the nozzle to the pump after it cuts off.
Also, I think the response Koz got from Toyota is a CYA statement. It is "very likely to cause damage" are the keywords, just to saying you have been warned.
Also, I think the response Koz got from Toyota is a CYA statement. It is "very likely to cause damage" are the keywords, just to saying you have been warned.
Overfilling
On my Miata, if the fuel tank is overfilled, the excess goes into the charcoal canister (used to capture fumes) and it floods the charcoal resulting in a CEL (check engine light). Then the canister must be removed and hopefully drained and aired out. Or if not successful a new one purchased. Perhaps the same is true on the 4Runner (we have a 2006, and I'm not "topping off"). In the old days, the overflow just went down on the road, can't do that now!
On my Miata, if the fuel tank is overfilled, the excess goes into the charcoal canister (used to capture fumes) and it floods the charcoal resulting in a CEL (check engine light). Then the canister must be removed and hopefully drained and aired out. Or if not successful a new one purchased. Perhaps the same is true on the 4Runner (we have a 2006, and I'm not "topping off"). In the old days, the overflow just went down on the road, can't do that now!
Kmvreter
New member
The way I see it this didn't matter in the old carb days. You had a low pressure pump sucking fuel at the engine. Since fuel injection the pressures are higher and the fuel pump is in the tank. Then they went to high pressure systems with a return line for port fuel injection. This is what I had on my former Jimmy. I don't top up completely. Normally I just round up to the next $ or 2. One time the pump nozzle was faulty. I heard the fuel filling the neck so I slowed down on the fill handle. Looked away at the pump to check the quantity and the next thing I know there is gas everywhere. The level was obviously at the top of the inlet. Shortly after, I have a hard time accelerating and holding idle and I smell gas while going home. Park the truck and look at the back and there is no leak or puddle/residue. Pop the hood and I smell gas again. The canister area is soaked. The hard driving was fuel backflowing through the vapour lines (due to gravity and tank pressure) and flooding the engine. The problem corrected itself after the level went down.
Does anyone know if the T4R fuel system is designed with a fuel return line? If so, that is why you need some room in the tank.
Does anyone know if the T4R fuel system is designed with a fuel return line? If so, that is why you need some room in the tank.
