Last post on Dec 02, 2013 at 4:56 PM
You are in the Ford Taurus/Mercury Sable
What is this discussion about?
Ford Taurus, Mercury Sable, Fuel System, Sedan
#101 of 177 Re: fuel pump [oldfordmech]
Apr 30, 2011 (3:52 pm)
The Fuel Pump makes the humming sound then I checked the valve stem like you said and only dribble comes out its like no pressure at all it seems, Just to add when I took off the gas cap there was no hissing sound either. So is this indeed the fuel pump, I did replace the fuel filter and when we took out the fuel pump everything was intact it looked fairly brand new, with that in mind, why doesn't the gas Gage work? If there is anything else I can do to determine what's wrong please let me know. Oh! One more thing I forgot to add the car sat in her drive way for about 4-5 months because her late husband bought her a 2011 ford taurus, he did start it every other day to pull it from the street to the dive way, if that makes a difference in solving my problem. I bought the car from my best friend last month. She was the second owner, her mom bought it from her best friend in late 1990 with only 15,000 miles on it...any ways if you could get back to me ..... Thank you
May 01, 2011 (8:06 am)
On your fuel rail, you have a fuel pressure regulator. It is about the size of a very small Dixie
cup and it has a vac. hose on the top. Do the same test as before, only this time pull off the vac. hose and see if there is any gas in this hose. if so replace this valve. if ithis valve is DRY,
them your pump may be the problem.
1 other thought, get a feul pressure gage from Auto-Zone ( rent at no charge ) and hook it up the the test port on the fuel rail. The fuelpump should build up about 40-45 lbs. pressure. If it does your pump is ok, but you could have a fuel injector not holding pressure and leaking into the cyl.
Do these checks and let me know.
#103 of 177 Re: Fuel Pump [oldfordmech]
May 01, 2011 (7:39 pm)
Hi, i have read all of the messages on here and on other web sites about these fuel pump issues on the Ford Taurus and Mercury Sable. Needless to say i can't believe how many of us have had the same issues and been unable to solve them. As usual Ford will not officially admit their responsibility. I have had the same problems as everybody else, the car runs fine, then one time you stop for 10-15 minutes and the car will not restart. let it sit for 1/2 hour and it starts and runs fine. This happened a couple of times then finally it stopped running altogether one day cold in the garage. I broke down and bought a motorcraft fuel pump, $325, put it in myself, thought the problem was solved, car ran great for 2-3 months, not it stopped working again altogether, no fuel pump run on initial ingnition switch on again, no start. now I have to start all over again, hopefully it will be something easy instead of a bad pump, one thing that bothers me about some of these posts is the guys that recommend runnning a seperate ground wire to the pump. After reading about the inertia switch being on the ground side of the pump, if that is true and you are telling people to run a seperate ground from the pump to under the rear seat to a " good ground " then you are telling people to bypass a very important safety feature of the ford fuel system. If you bypass that inertia switch and something happens to that car in an accident where the fuel pump keeps running and the fuel spills causing a fire and continuous flow of fuel keeps coming out, when Ford Motor Company put in a safety feature to prevent that, and someone dies in the fire, morally and legally you would be responsible for someones death, i know they may never be able to prove the death was a result of this post but your name and e-mail account are attached to this website and you could be drawn into a multi-million $$$ lawsuit, so before you go giving advise on how to disable safety features on vehicles you should think twice about adding wires or disconnecting wires that may or may not involve safety features that are built into cars by the manufacturer. Just my opinion be careful and be safe, fix it right or leave it to an expert, don't half ass your wiring systems on your car or you could be sorry, thanks for this website,
#104 of 177 Re: Fuel Pump [oldfordmech]
May 15, 2011 (8:31 pm)
I replaced my fuel pump did everything I was asked to do and I did not even get 5 miles and the dam thing did it again, only this time 4 to 7 hours later after being stranded it started I got it to Auto Zone where I bought the Fuel Pump asked to Borrow their Pressure Gage only to be told it would cost be $160.00 and when i bring them back the Pressure gage I would get the $160.00 back, now mind you my car was just outside their front door, but no they would not even let me borrow it they would not even come out their with me, I was told they do not do that kind of services along with the check engine light service.
Any ways do you think this could be a faulty Fuel Pump, my other one I had no problem hearing it this one i have to strain to hear it, and it did not correct my fuel gage problem, I have a full tank and it just started reading 1/2 a tank, it just verys some times it reads a quarter of a tank.
So far this project has cost me a total of $500.00 parts and labor and I am at my witts end a couple guys that work with me at the Auto Auction we are going to start from the rear and work our way to the front cleaning and inspecting every inch of this vehicle to figure out what the hell could be causing this. It is rediculous that Ford has not come up with a solution to this matter, Seeing that it is a on going problem with this make and model, you would think they would do everything in their power to fix or at least pin point why we are all having the same problem, with the way the economy is today we do not and can not afford being with out our vehicle let alone paying cost after cost to keep doing the same job over and over due to faulty parts and not knowing why this keeps happening to this vehicle. If you come up with any other ideas what may be causeing this problem, please I am all ears.
If we run into anything I will keep you all posted, we are going to clean, test, make notes of everything that is being done to my 1990 Ford Taurus L 3.0 6cly 4 door sedan....
Please any suggestions would be greatly appreciated..
Thank You... S
#105 of 177 Re: Fuel Pump [ladyautomech]
May 16, 2011 (6:37 am)
As far as your fuel level reading is concerned ............ the gauges in the car are electronic too. That being said they operate within a certain ohm range..... meaning resistance is what the gauge reads. Now there is a rheostat (otherwise known as a potentiometer) that is built into the fuel pump assembly .............. that works basically the same way the thermostat on the wall in your house works by varying the voltage that gets to the gauge. However there are instances where the gauge itself can be bad because the electronics in the gauge do not properly read the voltage coming from the fuel pump. I myself have only seen this a handful of times (maybe 3). So that all said you could possibly have 2 separate problems going on here. Like I said in a previous e-mail you need to make sure that the pressure relief part of the system is functioning properly. You may have a fuel pressure regulator on the fuel rail under the hood. There should be a vacuum hose attached to it........... if the car will start....... remove the hose and see if any fuel comes out. If it does replace the regulator the diaphragm inside is bad!! If it doesn't have the external pressure regulator I would almost have to say the pump is defective if the fuel pressure doesn't fall within specs. IMPORTANT........... make ABSOLUTELY sure that all the connections are good ESPECIALLY the ground!!!!!!!!!! In one instance I had to run a dedicated (separate) ground to the pump along with the one built into the harness........... I dont know why this made a difference......... I can't explain it........... but it did. The only thing that makes any sense is there was to much resistance in the harness ground. Anyway I hope this helps??? Best of luck to you!!
May 16, 2011 (1:15 pm)
1. Other cause of fuel pressure loss could be a leaking fuel injector, With everything turned off, radio, heater,door closed, seat belt latched.
Turn ign key from off to the run pos. listen for a humming noise that lasts 1-2 sec. then stops..
Does the car run at all ?
#107 of 177 Re: fuel pressure [oldfordmech]
May 17, 2011 (3:30 pm)
yes the car does run, only now after i run it for about 4 miles or let it idlel about 20 minutes then it shuts down and I am unable to start it again for about 2 to 3 hours. when it shuts down and i try to restart it, it souds like its not getting any gas, or theres no spark. does that make sence?
open for anything , thank you guys again...
#108 of 177 Re: fuel pressure [ladyautomech]
May 17, 2011 (8:30 pm)
This might sound really dumb but here goes. Is there a hose that is dedicated to venting the tank? If not does the car have a vented gas cap? This could be a simple case of just being vapor locked. In other words if the inside of the tank cant draw air from outside then it could be what they call vapor locking. Try running the fuel cap loose and see if the same problem persists and let me know.
May 19, 2011 (12:57 pm)
If you have a FORD fuel cap it is vented to let air into the tank, DO NOT leave your cap loose.
any excess pressure in the tank is stored in the fuel vapor canister. If you leave your cap loose, it could trigger your check engine light to come on.
After it dies
Remove the tire valve looking cap on the fuel rail and see if you get a shot of fuel or not. Press on the valve stem. DO NOT have your face over this valve when you press it.
Let me know
#110 of 177 Re: fuel pressure [oldfordmech]
May 19, 2011 (3:02 pm)
Just so ya know Cliff........................ been doing this about 20 years......... and it will not set an immediate code if she loosens the fuel cap for a couple of minutes. It has to have a couple of drive cycles on it before it will set that code. That code is for the evaporative emissions system and WILL NOT set immediately!! I thought this would be a good way for her to determine if its vapor locking once it dies. Ya know........... the car dies ........... loosen the cap.......... see if it starts and runs with full pressure!!! quick easy way to see if its vapor locked. Oh yeah .............. and in the future............ don't come back and make me look like I'm a complete fool................it REALLY pisses me off!!!!!!!!!!!!! Been doing this a helluva long time PROFESSIONALLY I might add............ with great success.......... I pretty sure I know what works and what doesn't!!!! Have a nice day!!