How to change fuel pump on mercury cougar 99 2.5L V6

SOURCE: we keep changing the fuel

Hello, There is a Relay for the fuelpump and it should be in a Powerbox. It may be cutting off power to the pump. Before changing another pump, have someone check and measure the Voltage going to the pump. Also check your fuel pressure regulator.

There is another switch which you would need to reset if the car detects a big impact. It is called an Inertia switch and is usually in the trunk behind the carpet on the drivers side. Another location can be low in the cabin by the passengers kickpanel. I do not believe it is your problem. It will kill the power to the pump and you should be aware that it exists.

Under the hood there are a series of Relays in the Powerbox. That is why there are several terminals on each Relay. When you turn your Ignition key, it activates Relays which activate more Relays. This is the way the car knows different important parts are turned on. Unfortunately it becomes a liability when there is an intermittent short in the series of co-dependent Relays.

The last power wire to the fuel pump is what is important. You work backwards from there to find out where the power is being stopped if that is the case. If you have a little money to possibly waste, your car is a 1999 model. The Ignition switch could be worn out and disconnecting the power.

I hope my solution is very helpful to you.

SOURCE: o2 sensors on a 99 mercury cougar v6

Should be 4. One in front of the catalytic converter and one after on both front and rear exhaust.