Where is fuel filter on 1990 taurus l

How To Test The Fuel Pump 1990 2000 3 0L Ford Taurus
You are on the right track in replacing the fuel filter. Not enough fuel is getting to the engine. It could be a number of other things ... bad fuel pump or dirty injectors to name a couple. The link shows how to check fuel pressure ... which would tell you if the things like the pump are bad.
Might try some fuel additive injector cleaner to the gas tank to see if things improve ... relatively easy.
If it is the fuel pump or other fuel supply problems ... those are harder to fix

if its not under the car in with the fuel line its in the tank if its in the tank it does not get replaced without replacing the fuel pump but i wanna say its under the car in the medal fuel line.toward the rear of the vehicle.

The fue filt on the taurus shoud be just about under the drivers seat on the frame. you need some small wrenchs 10mm to loosen clamps that hold tubing to the frame and the tool to remove ford fuel filters. $4 or $5 at advanced. The brake light should be behind the felt lining in the trunk. Turn the socket and pull it out then the bulb just pulls out.

Get the ignition module tested, you can remove it and most part stores can test them.

SECTION 310-01: Fuel Tank and Lines 2004 Taurus/Sable Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 05/25/2004 Fuel Filter — Early Build Vehicles Printable View (105 KB) Removal and Installation

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100-02.

1. Release the fuel pressure. For additional information, refer to Section 310-00.

1. Disconnect the battery ground cable. For additional information, refer to Section 414-01.

1. Remove the fuel filter.
   1. Push the release buttons and disconnect the fuel tube quick release couplings from the fuel filter.
   1. Loosen the clamp.
   1. Remove the fuel filter.

1. CAUTION: Make sure the fuel tube clicks into place when installing the tube. To make sure that the fuel tube is fully seated, pull on the tube.
   To install, reverse the removal procedure.

first... while you have 40psi engine off do you have good flow? should get more than 1/s liter in 30 seconds

additionally, are the injectors pulsing?

finally, what is the cranking speed and is it smooth?

keep us updated

It would be either under the hood on passenger side It would be a metal canister looking deal that has clips that hold it together. You should remove fuel cap to release any pressure. Also it is a good idea to look on your fuel rail and there should be a little valve that releases fuel press. You should use a rag on top of it so it doesn't spray.

Some of them, I don't believe you model does, but some have the filter in the fuel line under the car by frame. Just follow the fuel line and you will run into it. That type would have nuts on the lines to hold the filter in place and you would use a wrench to loosen it

You can go to autozone.com and register for free for a free repair manual for any vehicle.

Just inside the rear passenger wheel well. This is a fairly easy job. Be careful not to get gas all over the place, and make sure you put the new filter on in the correct direction.

Under the chassis below the fuel filler, you will see a plastic cylinder with two hoses going into it. This is the fuel filter. Before you remove it, depressurize your system by opening the gas cap.

Regards,
matt

If you can tell me your engine size I can post the whole job step by step.