Last post on Dec 02, 2013 at 4:56 PM
You are in the Ford Taurus/Mercury Sable
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Ford Taurus, Mercury Sable, Fuel System, Sedan
#10 of 177 2001 Mercury Sable 3.0 "U" code Fuel press. prob.
Mar 08, 2008 (7:29 pm)
First of all I am a certified mechanic and did work for a Ford dealership some years ago. I have been trying to address a fuel pressure problem with this 01 Sable. I have tried numerous different things from replacing the pump with a used assembly (by used assembly I mean the pump and module as a unit), to using the original module with a new aftermarket pump, to using the original pump with the different used module I purchased from the local salvage yard. The used unit I purchased has only 40,000 original miles on it. So I have had this pump in and out this car now 4 times trying different things and yes all the voltages check out at the harness. What I resorted to trying was running direct 12 volt power to both units after I re-assembled them and took a five gallon bucket and submerged just the section of the module that holds the pump. What I found on both units was quite amazing ........ something I've never seen before and believe me I've replaced A LOT of fuel pumps. These particular units have what I think is a bleed off valve in the module for excess fuel pressure or this maybe the check valve to prevent fuel from running back into the tank and draining the fuel manifold on the engine. I have not totally solved this problem yet but I am working on it and I will definitely update shortly as I have yet to figure out what makes this little valve tick and exactly what it controls. I know already I can bypass it and create the needed fuel pressure as I have already tested this, and the system still purges pressure as it should. So I am left confused as to why this little valve is even here. I will update soon.
#11 of 177 2001 Mercury Sable 3.0 "U" code fuel press. prob.
Mar 11, 2008 (7:26 pm)
Well everyone after many hours of work and a lot checks I now have the answer!!! Turns out I was dealing with more than one problem. My "little valve" right off the pump is indeed a anti-drainback valve. Which is the reason why the fuel was bypassing to the tank. So I purchased a complete fuel pump module from the local ford dealer and installed it, only to find out that now I have only 27 lbs. of fuel pressure. After a few hours brainstorming we decided to do a voltage drop test on the pump. Yup you guessed it ......... BAD ground!!!!!! The pump would build 27 lbs of fuel pressure and then shut off. Because this is a non-recirculating system as the pump builds pressure it draws more amperage and of course as we all know the more amperage you draw the bigger the ground you need. To make a long story short the pump would build 27 lbs and quit because it didn't have a good enough ground. Our fix was to run a dedicated ground off the module assembly drill a hole in the floorboard under the rear seat and ground it to the body there where we figured it would not corrode. So the long and short of the deal was the original pump probably went bad due to the poor ground causing the pump to try grounding through itself, hence burns up the pump. Moral of the story is as I like to say the K.I.S.S. (keep it simple stupid) method. I should have checked my connections first but since the pumps would run I never thought it would be an electrical connection........... hence everyone make sure you have a good ground it could conceivably be your only problem......make sure you run and auxiliary ground when you test for fuel pressure you can do it right at the pigtail connector. I know I will do that on every one I ever test anymore........ it will eliminate a lot of headaches.
#12 of 177 Re: 2001 Taurus fuel system problem, has 110,000 miles [timeun]
Mar 11, 2008 (7:30 pm)
Check your ground and read my 2 posts under mercury sable 3.0 "U" code fuel press. prob. it may save you alot of headaches and expense!!
#13 of 177 Re: 2001 Mercury Sable 3.0 "U" code fuel press. prob. [wrenched]
May 13, 2008 (11:19 am)
I am having a similar problem with a 99 ford taurus. The car will not run. The pump gives nothing. after removing the hose connected to the fuel filter to see if it would give anything or if there was a line restriction. I turned the ignition on and off a few times trying to see if it would cycle some fuel out. Nothing. After extensive electrical tests I found the pump was getting power. Thinking it must be the pump I replaced with a used pump. Still having the same problem I considered I must have got a bad pump. After reading your post I think there could be a similar problem. When turn on the key have 12 volts for about 1 to 2 seconds then drops to 6.8 volts. If you could help me with a few more details on what you did to ground the unit it would be greatly appreciated.
#15 of 177 Re: 2001 Mercury Sable 3.0 "U" code fuel press. prob. [vector1]
Jun 06, 2008 (10:10 pm)
We drilled a hole in the floor under the back seat and ran a direct ground from the pump to under the rear seat .
#16 of 177 Re: 2001 Mercury Sable 3.0 "U" code fuel press. prob. [quadrunner1]
Jun 06, 2008 (10:13 pm)
You can test by running a direct ground to the battery but we just ran a seperate one right under the backseat. Drill through floor and ground under seat ...... No corrosion to bother the ground under there.
#17 of 177 Fuel Pump and Circuit
Jul 21, 2008 (11:24 pm)
The fuel pump in my 1992 Taurus Sedan LX (3.0L) quit working. When I took out the old pump I checked the circuit (voltage and continuity) and it checked out fine so I replaced the pump. When I put the new pump in I lost all voltage from the IRCM to the pump. It is like a relay opens somewhere and does not allow any power to go to the pump. I have remade grounds, checked the auto shutoff switch, and tested both the old and new pumps (they are working fine) but as soon as I electrically connect the pump I lose all power from the IRCM to the pump. The IRCM is fairly new (within the last year).
Any and all suggestions would be appreciated as I am getting very frustrated.
#18 of 177 Re: Fuel Pump Problem - 2000 Taurus [kstoecklein]
Jul 30, 2008 (5:12 pm)
I was a ford tech back in 2000 and I'm pretty sure we had a recall on 2000 Taurus for the fuel pump, I know we replaced a slew of them, Do some research and you may be able to get a refund. (maybe)
#19 of 177 Inconsistent running problem - 2000 Taurus
Aug 12, 2008 (12:29 pm)
Hi, I Have A 2000 Taurus 3.0L. It Starts Easily And Runs Excellent At An Idle For As Long As You Want. The Problems Start When It's At Operating Temperature And While Driving. It Will Sometimes Miss Erratically (very Minor). Then Sometimes It Will Miss Severely Or Quit Altogether. Or It May Almost Quit And Catch Again And Run Fine. Sometimes It Is Worse Driving Uphill - But Not Always. Heres What I've Done So Far: Replaced The Spark Plugs And Wires, Checked The Catalytic Converters, The Injectors Have Been Cleaned And Tested At 100%, The Idle Control Has Been Cleaned And Checked, The Fuel Pump Seems To Be Working Fine. What I Need To Know Is Where Do I Find The Ground Wire For The Fuel Pump And Does The Fuel Tank Have To Be Dropped To Get At It?. I Also Need To Know The Fuel Pressure When The Engine Is Started Cold And When At Operating Temperature. If Anyone Has Any Other Ideas As To What The Problem Is Any Help Would Be Appreciated. Thanks, Bob