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Thread: 2000 Taurus SES Constantly getting 13-15mpg..... Reply to Thread
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  Topic Review (Newest First)
06-28-2012 10:32 PM
Nick3.0L I'm back, with something interesting about my taurus.

If any of you recently read my thread on transmission fluid change, i said i was going on a road trip today.

I did,and drove about 500 miles round trip. All went well, and i calculated the fuel mileage(i know its not exact).

Before we left town, i filled up at my local Shell gas station, and i had a bottle of techron fuel system cleaner laying around, and i threw that in the tank too before filling up.

When we filled up the next time, i did 195 miles on 6.4 gallons of gas, That's about 30 mpg! (and the a/c on most the time).

I drove about 55 miles, we arrived to my cousins college, threw all her stuff in the trunk (Completely full!), and starting driving back home, we filled up again a while later ( i forgot the numbers) but i calculated about 25 mpg. ( makes sense with 5 ppl in the car with the trunk PACKED, and a/c on)

Well i'm back home and so far there is little bit over a 3/4 tank full, and about 90 miles or so on the trip odometer. lets see the mpg on this tank.
Oh, and if it even matters the two gas stations i filled up with during the trip were Sunoco stations.


But i do need to get that fuel pressure regulator replaced, do an oil change, and do a pan drop on the transmission ( i'm too chicken to do the "at home flush". Don't want to mess my tranny up by running the pump dry or something).
06-27-2012 09:46 PM
mckeighan Even with suspension issues, I get between 23-27 mpg with my 02 SEL. I drive round trip 85 miles a day to work, all on mostly flat 40-55mph roads, in city driving I got around 20..However, if I sit on an uphill incline, it likes to tell me I have up to a 1/4 tank of gas less than I do, which is bothersome when your driveway is oddly graded..
06-27-2012 05:13 PM
Nick3.0L Cool, i'll change the pressure regulator when i get the extra cash. ($117 on rock auto).


Also, that engine bay picture is NOT mine, its from the internet.
06-27-2012 04:59 PM
behlinla Well, glad you found it! So I would replace the regulator/pressure sensor.

Silver thing is the second picture is the fuel pulse damper. And that breather line is disconnected if that's your picture.
06-27-2012 02:30 PM
bull geek I assume you know the vacuum line going from the valve cover to the air intake/accordian is in need of replacement...
06-27-2012 11:21 AM
sheila ^ 1st pic.
06-27-2012 10:02 AM
Nick3.0L OKAY!

I did it all over again, and the fuel; pressure stays at 39-40 no matter what you do, i disconnect the red vacuum line, it has vacuum, and i dont smell gas, and it stays at 39-40.

So its my fuel pressure regulator?

and make sure i checked the right thing, this is a picture of what i checked, but i think its the pressure sensor not regulator.

Attachment 63449

Or is that silver thing a little bit further back the regulator?Attachment 63450
06-27-2012 09:30 AM
Nick3.0L
Quote:
Originally Posted by behlinla View Post
Thanks for the tests. So it seems the fuel trims are getting better at speed.

I'm running out of suggestions here, but one thing I do wonder about is the fuel pressure regulator. Check the fuel pressure again at idle (I think it should be less than 35 psi). Then pull off the red? vacuum line going to the fuel pressure regulator and see if the pressure goes up about 5 psi or more. Also check and make sure you are getting vacuum at the end of vacuum line for the regulator. Finally, sniff the nipple on the regulator when you take the vacuum line off. If you smell gas the regulator is leaking.

Other than that, I'm not sure what to suggest other than possibly replacing the upstream oxygen sensors. Your fuel trims are really pretty normal driving down the highway.
well, the fuel pressure has been 39-40psi the several times i checked it with the tool. So it looks like I may have a problem with the regulator.
I'm gonna check it the way you said, and I'll see if that's it.
06-27-2012 12:19 AM
behlinla Thanks for the tests. So it seems the fuel trims are getting better at speed.

I'm running out of suggestions here, but one thing I do wonder about is the fuel pressure regulator. Check the fuel pressure again at idle (I think it should be less than 35 psi). Then pull off the red? vacuum line going to the fuel pressure regulator and see if the pressure goes up about 5 psi or more. Also check and make sure you are getting vacuum at the end of vacuum line for the regulator. Finally, sniff the nipple on the regulator when you take the vacuum line off. If you smell gas the regulator is leaking.

Other than that, I'm not sure what to suggest other than possibly replacing the upstream oxygen sensors. Your fuel trims are really pretty normal driving down the highway.
06-26-2012 07:54 PM
Nick3.0L
Quote:
Originally Posted by behlinla View Post
Okay, now report the same data again while you're cruising at 40+ MPH. If you scan tool has a data logging capability, I would use that. Also report RPM if you can.

Vacuum leaks create positive fuel trims, so it does not appear you have a vacuum leak based on the data. It's still possible you have a small one, but it's being masked by whatever else is wrong.
Okay, i was trying this earlier, and the Lt trim 1 was : -0.8, and Lt trim 2: -3.0 or so. its hard to get reading by myself going 45 or so on the highway...lol. I think the rpms were around 1500 or so.
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