I replace the fuel pump assembly on a 2005 ford taurus when i turn the key on i don't hear the pump run what could be the cause?

replace the relay, jumper wire wont work, there is a small set of points inside the relay, there probably burnt, or stuck open

Enough to fill a lawn mower fuel can should suffice as long as the car is on level ground.

Could be a bad switch. Use a ohm meter to check each switch position. Use fuel pressure gauge to test for correct pressure. Use noid light to check for injector pulse. Check for ingnition spark.

Can you hear the pump whirring noise when you turn the key on? A totally stopped up filter can ruin a pump quickly, but it could be the fuel pump inertia cut-off switch in the trunk needs reset by pushing down the red button. don-ohio

If the pump is running but not pumping gas, it's a bad pump or a clogged filter sock in the tank

Sounds like the fuel pump in the tank is not coming on.
There can be other reasons for this besides a bad fuel pump.
Stand by the rear of your car near the tank, and take the fuel filler cap off. Have someone turn the key to on (not cranking). You should hear the pump come on for about 2-3 seconds to pressurize the fuel lines, then shut back off. If you hear it, then pump is working. If you don't hear it, you'll need your fuel pump checked. It or the circuit is not working.

You would change the fuel filter, crank sensor and run a can of fuel injector cleaner in a tank of gas, you may also want to remove the Throttle Body cover, get a can of carb cleaner and spray the heck out of the TB do this while running throttleing it, dont let it idle, it will die out on you.

Keep in mind that the starting problems typically come from problems with the battery, starter, fuel pump, or ignition. Checking these things in your Ford Taurus can be done with a few automotive tools. Once you have isolated the problem, you can decide to fix it yourself or take it to a professional:
1. Place the key in the ignition and turn to the "On" position. The dashboard on your Taurus should light up. If it does not, it indicates that there is a problem with your battery.
2. Open the hood of your Taurus and check the battery for corrosion or loose connections. For corrosion, clean the connections. Tighten any loose connections. Attach a voltmeter to the battery. The red lead goes on the positive terminal and the black on the negative. On a Taurus, 12.5 volts or better are needed to power the car, and between 13.8 to 14.5 to run the alternator. If the voltmeter shows 12.5, then the battery is okay; if it is between 12.5 to 13.8 then the alternator needs to be replaced.
3. Turn the key in the ignition. If you hear a clicking noise, your starter is faulty and needs replacing. If there is no noise, the ignition switch could be the culprit.
4. Turn the key in the ignition on and off for three seconds, then on again. Listen to the Taurus. In a Ford Taurus, the fuel pump operates for only two seconds. When the key is turned on, you should hear a sound similar to a growl or "rrr." If you do not hear the sound, your fuel pump is not working properly to send fuel through your car.
5. Remove a spark plug from your Taurus and lay the wire to a metal surface. If there is no spark, the engine is not igniting properly, and you need new spark plugs.


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If you can hear the fuel pump come on when you turn the key to the run position, then you turn key to start car...and the car will start and run for one or two seconds...then you may have a bad crank position sensor. Go to autozone.com, become a member and look up crank position sensor for your car. There will be a tutorial on testing and replacement.

yeah check the pressure with a fuel gauge should have around 40 psi or so. can u hear the pump run momentarily when you first turn the key over? if u have no fuel pressure then remove the backseat and check the wiring and make sure theres power to the pump.

did u changed the fuel filter, check fuel pump relay might be faulty