If you are unsure, check out this article on troubleshooting catalytic converters. A bad catalytic converter will not feel as jarring.

Both conditions will make the motor feel like it is running out of wind when you hit the gas. Now, a bad fuel pump can also feel a heck of a lot like a bad catalytic converter. That’s what it feels like with a bad fuel pump. Typically, if you are heading up a hill (or accelerating) the engine may start to feel like it is just running out of steam. The only way that you are going to know that your Expedition ‘s fuel pump is going out is that it is no longer providing enough fuel pressure to keep the engine running under a heavy load, or at high-speed. It’ll sound like a low frequency buzzing sound. Keeping an open ear can save you from getting stuck somewhere with a bad fuel pump. The whining sound can indicate that the fuel pump is going out before there are any performance based issues. One of the most common signs that a fuel pump is going bad is a whining sound. Here are the most common symptoms of a bad fuel pump in your Ford Expedition : Also, the symptoms are almost exactly the same as bad/clogged fuel filter. The real issue with diagnosing a bad fuel pump is that it resembles many other vehicular issues in terms of symptoms. Sometimes when there is low fuel pressure, you may also get an oxygen sensor related trouble code as well.

Any trouble codes that exist could be a clue. This trouble code detects that the fuel rail/system pressure is too low. The engine may throw a P0087 trouble code. Before taking anything apart, check to see if your engine’s computer has any trouble codes saved in it. There are physical signs that you can feel when your Expedition ‘s fuel pump is going out. The bad news is that they cost a lot in terms of labor to repair and replace. The good news is that fuel pumps are inexpensive. While being in the fuel tank makes the pump more reliable, it also makes it a lot more difficult to get to. It is in the fuel tank because “pushing” fuel to the fuel rail is easier than “pulling” the fuel, which is what an inline pump would do. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail(s). With that in mind, most of the symptoms of a bad fuel pump revolve around the vehicle stalling out or not running at all. Without gas your Expedition will not run at all. If your Ford Expedition ‘s fuel pump goes bad, no fuel (or not enough fuel depending on whether or not it’s out all the way) can enter the engine. One of the worst problems that can happen to a vehicle is a bad fuel pump.

2003 ford expedition fuel pump location