1987 Mercury Marquis fuel pump

THis is going back awhile. I believe you have a carburator and not fuel injection. If this correct, you will have a mechanical pump. It is located on the driver's side of the engine near the oil filter. Here is a picture:

To check your pump, you need to do a volume test. The pump should produce 1 pint of fuel in 20 seconds. You may want to check it before replacing it. Here is a picture of the pump:

If your vehicle is fuel injected, let me know. It will have a completely different set up. Let me know. Joe

I'm certain it is fuel injected. I have attached a photo for confirmation. My concern is that the fuel pump is in the tank. My folks had a t-bird from around the same time and I thought the pump was in the tank on that model. Don't know if Ford/Lincoln was doing that on a lot of models at the time.

You are correct. It is fuel injected and I hate to say it but the fuel pump is in the tank. It is electric. I would recommend checking the fuel pump pressure?

It's an electric fuel pump. Keep in mind, there could be a problem with the fuel pump relay, fuel filter... Here is a "How To" for checking the pump. You will need a pressure gauge. Most parts stores will lend or rent them. As far as the process, it is easy to check. Please pay attention to fuel pressure drop off. THat is when you shut the key. Note how quickly the pressure drops.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find and we'll move in from there.

Joe