![]() ![]() ![]() Having a tough time filling the tank? Disconnect this EVAP vent pipe and see if it fills easier. With vehicles made after 1996 this is accomplished with the EVAP system and canister vent valve. You need a second path to let the air out while fuel is going in. The reason is simple, if you’re putting fuel into the tank, you’re displacing air. This safe location requires some plumbing to get fuel into the tank, typically two hoses - one larger and one smaller. This is great in that it is unlikely that a collision will damage the tank. One of the better safety features in fuel tank design is putting it in the center of the vehicle, tucked up behind the frame on trucks or in a nook, under the back seat, on cars and smaller SUVs. Fuel gauge inaccuracies, leaks, trouble filling the tank, and certain EVAP failures are known to be problematic for the diagnostic technician, mainly because they are so rare one typically doesn’t have the opportunity to learn from the experience of regularly seeing them in our shops. For the purpose of this discussion, even though it’s in the fuel tank, we will be considering the fuel pump part of the fuel injection system. When considering the fuel tank as your focus in a diagnostic procedure, you will typically be looking at a short list of very particular symptoms. ![]() Pulling the nozzle partially out of the filler neck will defeat the safety and allow overfilling that can damage the charcoal canister eventually making filling the tank even harder. We’ve all seen this a million times, but have you ever looked at it? The grid of holes near the end nozzle house the trigger that stops the pump if it senses liquid gasoline. ![]()
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