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Fuel pressure - Fuel pump?

Tiny
SNOWGOER
  • MEMBER
  • 2003 DODGE RAM
  • V8
  • 4WD
  • AUTOMATIC
  • 50,000 MILES
I have a 2003 dodge ram 2500 with a hemi. It is running really rough. Checked the fuel pressure and it is around 80 lbs. Replaced the filter regulater and did not fix the problem. Any ideas?
Saturday, January 8th, 2011 AT 7:24 PM

33 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The fuel pressure should be 47-51 - 80 is too high.

Fuel System Pressure: .................... 339 kPa ± 34 kPa (49.2 psi ± 2 psi).

Use this guide to see how to test the pressure after you install the new pump and regulator check the diagrams below to see how to get the fuel ump and regulator out.

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

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Saturday, January 8th, 2011 AT 8:51 PM
Tiny
CHARLESDEAL
  • MEMBER
  • 1 POST
  • 2003 DODGE RAM
  • 80,000 MILES
My 5.7 hemi.I was driving 45 mph loss power when I let up on the gas it guit now I have to hold it half paddle to start and if I let get below 2000 rpms it will guit ive changed crank seednsor.
Checked compressoin, spark. Fuel pressure. And not giving no codes
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
It sounds like a fuel system problem to me. The problem is it is intermittent. It is one of those things that is mal-functioning but has not yet failed or gone out of the levels which would set of a check light. I think it is either the pump relay, the pump itself, or the fuel pressure regulator.
You are going to have to wait for it to fail enough to trip the Check Light. Then you can get an idea of what is wrong.

Good luck.

Dr. C
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MBJOHNSON
  • MEMBER
  • 7 POSTS
  • 2001 DODGE RAM
  • 13,000 MILES
Run five miles loses engine power starts back fireing out the throttle body
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
The regulator is bad.
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MBJOHNSON
  • MEMBER
  • 7 POSTS
I replaced the fuel filter regulator. You think it was a bad one. Is there a way I can test it. I have changed everything but the fuel pump trying to getthis truck to run. It say when installing the regulator to put it in the same position I did. It ran for maybe ten miles then started back.
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
How high is the pressure? And yes, you may have gotten a bad one. That is what regulates the pressure.
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MBJOHNSON
  • MEMBER
  • 7 POSTS
The recommended presure is 42 it goes to ninety something
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Okay, that isn't good. I has to be a bad reguator. Or, something is blocked. If I recall, there isn't a return from the fuel rail. Correct?
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MBJOHNSON
  • MEMBER
  • 7 POSTS
No it has no return from the fuel rail. Where would a block be if its not the regulator. Oh I didnt have the tool for the clamp that came with the regulator so I baught a regular clap that has a flat head on it. That wouldnt have made a different would it
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
It shouldn have made any difference. The only thing I can think of is somehow the reguator is not able to return fuel back into the tank. As a result, the pressure builds.

I hate to say it, but I think the tank needs to come back out so you can inspect everthing. I just read through checks on Mitchel. If the pressure is too high, it says the regulator is bad. I hate to say it, but either it is bad, or something is causing it to not work.
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
TIMCZAP
  • MEMBER
  • 2 POSTS
  • 2000 DODGE RAM
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I have a 2000 dodge ram that will not start. The timing is on it has spark and fuel pressure (45 psi). When I begin to crank the motor the pressure begins to jump alll over the board from 30 to 60 psi. Is this a defective regulator and wiould this be my possible cause for the vehicle not to start?
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Fuel pressure is with in spec.
Check for injector pulse
also disconnect O2 sensor and give it a try
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MBJOHNSON
  • MEMBER
  • 7 POSTS
Ok would it be stopped up in side the tank to the regulator or on the out side of tank between regulator to where the line hook up to
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
I would think in the tank, but check everything to make sure nothing is plugged.
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MBJOHNSON
  • MEMBER
  • 7 POSTS
So check the line in the tank that is hooked to the regulator, and the line on the out side of the tank leaving the regulator
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Check it all. Also, return the new regulator telling them it is bad and get another one.
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MICHAEL WELCH
  • MEMBER
  • 1 POST
  • 2002 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
The truck stalls at stop lights and runs fine otherwise
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Also check for vacuum leaks and idle air control valve...
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)
Tiny
MBJOHNSON
  • MEMBER
  • 7 POSTS
Thanks alot jacob for the help because I didnt know what I was going to do. I have no money to put it in the shop. I thank god for yall web site it is a big help to us low income want to do it yourself guys.
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Tuesday, April 23rd, 2019 AT 4:08 PM (Merged)

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