Question about 2007 Toyota Tundra
2007 tundra 2wd 5.7 engine
The actual reason is maximize your fuel mileage.
The engineering is as follows:
There are times when the fuel injectors shut off when you are driving, like going down a long hill. There is no need for the injectors to "work", as you are coasting without giving it any gas. But, the engine will stall out with no injector action. So, how does Toyota keep the engine running? From the gasoline FUMES in the fuel tank. There is a tube on top of the fuel tank whch siphons the fuel vapours...The vapours then are stored in something called a charcaol canister, in which the "charcoal" absorbs the fumes from the tank, and, when coasting, the injectors stop injecting, and the stored fumes are admitted into the intake manifold thru a valve controlled by the Electronic Control Unit, or ECU. The fumes are used by the engine, thusly maximizing your mileage, other than losing them by letting them escape out from under the fuel cap. Now, to answer your question: If the vehicle is "overfilled", there is no place for the fumes, other than in the top of the filler neck. And the siphon tube is on top of the tank. The ECU sees the overfill condition as a "blockage" in the fuel fume vent line (only fumes should be in this tube), and said "blockage" will transmit this to the ECU, thru a sensor, & turn on your check engine light. The overfill actually "lies" to the ECU, even though there is nothing wrong. Best thing to do: When filling the tank, stop after the handle clicks off.
I hope that I have explained this to your liking.
Posted on Sep 26, 2008
When you overfill the gas tank, it triggers Codes 0441 and 0455 (emission codes) which are difficult to solve. The gas goes into the charcoal canister meant only for vapors and you have to replace the unit which is about $600.00 for the part alone.
Posted on Mar 17, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Oct 21, 2016 | 2007 Suzuki XL-7
Feb 29, 2016 | Toyota Cars & Trucks
Sep 10, 2015 | 2001 Toyota Tundra
Jul 23, 2012 | 2007 Toyota Tundra
Mar 25, 2011 | 2007 Toyota Tundra
Jan 18, 2011 | 2001 Toyota Tundra
Dec 22, 2010 | 2006 Chevrolet Silverado 1500 2WD
Apr 04, 2010 | 2007 Toyota Tundra
Dec 10, 2009 | 2007 Toyota Tundra
Nov 04, 2009 | 2007 Toyota Tundra
2,058 people viewed this question
Usually answered in minutes!