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Old 02-15-2009, 03:37 PM   #1
nukldragr
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fuel pressure regulator?

During my 100 mile commute yesterday car started surging on the freeway...has done this a couple of times the last month or two...and usually happens around 80 miles into the drive...Just happen to have my scanner in the car this time so i hooked it up...was showing fuel pressure was dropping to 3 psi when i would accelerate...let off the gas and it would go back to 40 psi...Hasn't thrown a code yet either...have done some searchs and read about a fuel rail pressure sensor but not really anything on a regulator...is a regulator built into the fuel pump? Thanks, Tim


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Old 02-15-2009, 03:42 PM   #2
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There is no fuel pressure regulator on these cars, the pump cycles on and off to control pressure.
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Old 02-15-2009, 04:24 PM   #3
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Also forgot to add that on my way back home after work fuel pressure held steady around 40 psi no matter where the throttle was... Saw on ebay a fuel pump driver module... where is this located... can the fuel pump come and go like this?


http://cgi.ebay.com/00-01-02-03-Ford...3A1%7C294%3A50
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Old 02-15-2009, 05:14 PM   #4
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You had your fuel pump recall done ??? Verryy common.
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Old 02-16-2009, 02:04 PM   #5
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Quote:
Originally Posted by Onyx flash View Post
There is no fuel pressure regulator on these cars, the pump cycles on and off to control pressure.
really???? what about black plastic(kinda valve) thing on left side of fuel rail?? I thought it's preasure regulator, hm..
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Old 02-16-2009, 02:59 PM   #6
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jacx81 is right.. our cars do have fuel pressure regulators lool the funny little saucer thing on the end of the fuel rail is just that! lool
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Old 02-16-2009, 04:27 PM   #7
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> was showing fuel pressure was dropping to 3 psi when i would accelerate...let off the gas and it would go back to 40 psi..

Well, let's see, when you have a high fuel demand the fuel pressure drops, but when fuel demand is low, pressure is OK.


When was the last time you changed the fuel filter?
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Old 02-16-2009, 04:31 PM   #8
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> our cars do have fuel pressure regulators


I believe that is a fuel pressure sensor, providing fuel pressure information to the fuel pump control module. This is different from the traditional fuel pressure regulator, which physically regulates the fuel pressure:

http://www.atlanticz.ca/zclub/techti...0regulator.gif

http://www.zetecinside.com/xr2/pictures/040301_4.jpg
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Old 02-16-2009, 11:44 PM   #9
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Changed fuel filter about 2 months ago... kept the scanner on it to and from work today and it keeps between 38 to 40 psi now no matter where the fuel demand... this problem only comes up every now and then...could the fuel pump be overheating at times...usually happens after about 80 miles into my drive...
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Old 02-17-2009, 12:17 AM   #10
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As mentioned ensure that the recall was accomplished. Try
"wiggling" the harness connector at the FP sensor and/or check the connector contacts and sensor pins for corrosion. That pressure regulator looking object is the fuel pressure damper, I believe.
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