Fuel pressure

Tiny
MJBLANTON77
  • MEMBER
  • 1994 FORD RANGER
  • 4 CYL
  • 2WD
  • MANUAL
  • 250,000 MILES
What should the fuel pressure be at the fuel rail of a ranger with the 2.3 liter engine?
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Thursday, December 3rd, 2009 AT 5:23 PM

62 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
28-45 psi with key on engine running (KOER)

35-45 psi with key on engine off (KOEO)

Here is a guide to help you check it

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please let us know if you need anything else to get the problem fixed.

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Thursday, December 3rd, 2009 AT 10:35 PM
Tiny
BRIANL88
  • MEMBER
  • 1992 FORD RANGER
  • 4 CYL
  • 2WD
  • MANUAL
  • 119,800 MILES
The truck died can hear the fuel pump come on pulled the fuel filter off fuel came out & stopped, bought a pressure tester read 25 psi also can not get spark.
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Friday, April 19th, 2019 AT 2:46 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
KOEO fuel pressure should be 35-45psi

No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it
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Friday, April 19th, 2019 AT 2:46 PM (Merged)
Tiny
BRIANL88
  • MEMBER
Thanks will try & let you know the results
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Friday, April 19th, 2019 AT 2:46 PM (Merged)
Tiny
GOINGCRAZY
  • MEMBER
  • 1992 FORD RANGER
  • 15,300 MILES
Fuel pressure is good timing is on and have a good spark
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Friday, April 19th, 2019 AT 2:46 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Ok, we need to look at the back pressure in the exhaust for possible restriction. You can get a back pressure gauge and insert it in the o2 sensor port and measure. It should not be over 1 lb

Roy
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Friday, April 19th, 2019 AT 2:46 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Fuel pressure is good timing is on and have a good spark -But are the injectors pulsing-clogged exhaust will prevent it from starting the engine is not breathing properly.

Timing is dead on-how did you determine this?

No backpressure gauge -disconnect the exhaust pipe from the exhaust manifold and see what happens
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Friday, April 19th, 2019 AT 2:46 PM (Merged)
Tiny
WILKOM
  • MEMBER
  • 2000 FORD RANGER
  • 4.0L
  • V6
  • 4WD
  • MANUAL
  • 141,000 MILES
I have had a new fuel pump installed. The system is a non return system with the fuel pressure regulator in the fuel tank. The truck does not start immediately after being shut off for a few minutes. It starts and runs but the gas mileage has dropped by over twenty percent. Cannot seem to get rail fuel pressure over 50 psi. Specs indicate I need 56 PSI minimum. Does the fuel pressure damper have anything to do with this?

Prior to replacing the fuel pump (required due to pump failure) the engine ran fine with consistent 15 to 17 mpg depending on type of driving. Have been trying everything I can think of or google. Any ideas?
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
I am finding a lot of conflicting information on this vehicle but the one consistent thing I find is the fuel pressure spec of 30-65 PSI. That is an unusually wide range and normally associated with pulse modulated driver systems but I am not showing that on this vehicle. The data bases are showing this as being a return type system with the regulator on the fuel rail.
Could this be a non-US vehicle or something like that?
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WILKOM
  • MEMBER
The tag in the door frame indicates US manufacture which is consistent with theVIN number starting with one. In my research, I found references to it being a non return system. I believe this is correct as there are three connections to the fuel filter. Two at the back which connect to the pump. I believe these are the supply line and re circulation. Then the one going to the fuel rail. The new pump is an Airtex model E2270S. The shop manual I have gives the fuel pump pressure spec as 64 +/- 8 PSI.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
There is a good example of conflict. The factory shop manual that I have (Alldata) states the pressure spec is 30-65 as I stated before. I checked Mitchell and it agrees with you. I can't find any consistent information on this particular truck.
If you have a filter with three lines on it, that generally means it is acting as a regulator. You might try changing that.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WILKOM
  • MEMBER
I have changed it as well suspecting it was part of the problem. I use the Ford workshop manual I picked up on E-bay about seven years ago.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
I have access to the Ford service site and it pretty much confirms everything you said about the system.

The first thing I would do is confirm there is no voltage drop or ground problem in the wiring to the pump. Beyond that, you have to be looking at an issue with the pump, either defective or wrong application or a problem with the regulator.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
AUTOBAHN_PARTS
  • MEMBER
  • 2007 FORD RANGER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 64,000 MILES
Fuel pressure on 2007 ford ranger

64K on the truck, auto-trans delivery truck for our business. 2.3L 4 cyl. AC. The fuel pressure falls on it's face sometimes. We have been fighting this off and on over 6 months. We have put 3 pumps in it. Fuel filters etc. The pressure measured at the port on the rail is about 65-70psi when the problem shows up it goes down to 15. The system is return-less. Two lines go into one end of the fuel filter, one goes out the other end to the fuel rail. The fuel pump assembly has a regulator on it that is inside the tank. I know BMW's and Porsche's very well. But this POS is really throwing me. Our first pump died because of junk in the tank. It was 100% cleaned out and filters swapped (and cut open to look for goodies). We have done the oblivious.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
AUTOBAHN_PARTS
  • MEMBER
Photo of the first pump.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WILKOM
  • MEMBER
I was told the voltage was checked. I will have to check it myself to be sure. Believe it or not, this is the second new pump installed. Due to the problem, I had the first replaced with a second. Problem remained. I picked up the idea somewhere that the pump controls pressure by varying the speed or somehow pulsing the pump. I am wondering where the signal comes from and how to check this. Have you ever run into anything like this? Am I misunderstanding something?
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
If it is droping that much, are you sure the vent to the tank isn't plugging and not allowing air to enter as the fuel is used? Also, when it drops to 15 psi, have you checked pressure at the fuel filter to see if it is low there too?

This is going to be an interesting one, I can tell.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WILKOM
  • MEMBER
Just wanted to add that I am appreciating your input regarding my dilemma. I have been working on this problem for about four to five weeks and have checked and changed anything I could find might be the problem. Thanks again for taking the interest.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
AUTOBAHN_PARTS
  • MEMBER
We have tested for that one. And it's never made a sucking sound when taking the cap off. We did try and run the cap loose to test for that a few months ago, and it just kicked on the check engine light.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
No, you are describing Pulse Width Modulation which your truck is not equipped with. That requires a Fuel Pump Driver Module which you do not have.
Checking voltage and voltage drop are two different thing. A voltage drop test reads loss in the circuit.
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Wednesday, May 1st, 2019 AT 6:36 PM (Merged)

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