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Where is the fuel pressure regulator/sensor located?

Tiny
DAVID HOBART
  • MEMBER
  • 2009 FORD FUSION
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 182,000 MILES
If you turn the switch on and leave it on for a few seconds you can hear the fuel pump run then shut off, if you do this a few times the car will start and run for a minute or so then stop. Changed the mass air flow sensor no change, changes crankshaft sensor no change. If you spray starting fluid into the air intake lightly continuously it will stay running, can't locate fuel pressure regulator/sensor, checked under back seat on fuel tank and followed the fuel line from the injector rail to tank and nothing. Help, please and thank you.
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Monday, July 31st, 2023 AT 1:28 PM

6 Replies

Tiny
MATHGEN
  • MECHANIC
  • 128 POSTS
Hello, sorry to hear you are having problems. I'll do what I can to help you out. Even though you can hear the fuel pump running, it may not be providing enough pressure or volume. If you can test the fuel pressure at the fuel rail, the pressure should be about 45-57 PSI with the engine running. We have had problems in the past with the fuel rail pressure sensor, but it will usually set a code. I have uploaded a diagram that shows the location of the sensor on the fuel rail. If you decide to replace the fuel pressure sensor you will want to lube the o-ring lightly.
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Tuesday, August 1st, 2023 AT 6:52 AM
Tiny
DAVID HOBART
  • MEMBER
  • 4 POSTS
This fuel rail has no place for a pressure sensor, The fuel pump is holding 55 PSI when cranking and has no bleed down for 10 minutes, my guess is the fuel pump module controls the pressure. Thank you for any help you can give.
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Tuesday, August 1st, 2023 AT 9:39 AM
Tiny
MATHGEN
  • MECHANIC
  • 128 POSTS
Sorry for the confusion on the sensor. On your vehicle the pressure regulator is in the pump module. The fuel pressure is fine. Do you have access to a scan tool that can read live data? If the car runs for a short time and then dies, it may be due to a faulty sensor reading when the PCM goes into closed loop.
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Tuesday, August 1st, 2023 AT 12:06 PM
Tiny
DAVID HOBART
  • MEMBER
  • 4 POSTS
Thank you for responding. It will only start if I use starting fluid and when I stop spraying it will stop. But I have noticed that when the engine starts to get warmer it tends to run longer after I stop spraying the starting fluid it ran 1 time for over a minute then shut off. And the scan tool showed no codes. Thank you
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Tuesday, August 1st, 2023 AT 12:13 PM
Tiny
DAVID HOBART
  • MEMBER
  • 4 POSTS
I think I might have found the problem, found an intake leak between cylinders 2/3 and when you move the intake runner manually you hear a sucking sound. Your thoughts?
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Tuesday, August 1st, 2023 AT 7:28 PM
Tiny
MATHGEN
  • MECHANIC
  • 128 POSTS
Thanks for the update. A leaking intake manifold can definitely cause your problem. As far as the intake runner goes, I don't think there is an issue. When the runner is shortened it will change the turbulence in the intake. I would proceed with the repair of the leak.
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Wednesday, August 2nd, 2023 AT 4:20 AM

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