Fuel pressure woes? - Dodge Cummins Diesel Forum
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post #1 of 14 (permalink) Old 05-14-2019, 07:34 AM Thread Starter
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Fuel pressure woes?

Good morning all,
This morning on my way to work I was watching my fuel psi on my cts2 monitor. I do not have a programmer. At idle with my foot on the brake I read around 5.2-5.3k psi and at wot the most I’ve witnessed is 17k. This seems low to me and I want to know if it’s something I should be worried about. I have no idea if/when the injectors were changed. My truck is a 2003 non ho 5.9l 47re 3500 4x4. My truck does have the lope at idle every now and then when warming up. The fuel filter was changed 2000 miles ago. Truck has 319k on it, was bought with 310k on it back in December. Thanks in advance for any and all input.


Jason- 99' dodge 3500 flatbed, 2wd, 3.55's, nv5600, airdog 100
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post #2 of 14 (permalink) Old 05-14-2019, 04:14 PM
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I don't know if this is any help. I have a CTS2 monitor as well. But my truck is an 04.5 and may work differently. My rail pressure at idle is consistently in the 6-7K range. I can't say what it is WOT because I haven't really paid attention. I'll try to remember to goose it next time out and take note of the pressure.

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post #3 of 14 (permalink) Old 05-14-2019, 06:59 PM
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17k for fuel pressure is fine, its rail pressure you should be monitoring..

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post #4 of 14 (permalink) Old 05-14-2019, 07:17 PM
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17k for fuel pressure is fine, its rail pressure you should be monitoring..
He is talking about RP. 17 KPSI is 17,000 PSI. The lift pump is not capable of 17 KPSI. Even if it was, it would blow lines and seals. The edge CTS2 cannot read fuel pressure unless you put one of their sensors (EAS i believe) in.

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post #5 of 14 (permalink) Old 05-14-2019, 07:20 PM
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Your reading Rail Pressure, your idle RP is fine, seems a bit low at WOT. My 03 idles at about the same amount.

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post #6 of 14 (permalink) Old 05-14-2019, 07:20 PM
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Do you have hard starts/long cranks or white smoke at start up?

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post #7 of 14 (permalink) Old 05-14-2019, 07:26 PM Thread Starter
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Thanks to everyone for the replies. I checked again on my way home from work and hit 22k at wot so I jumped the gun posting so soon. Now I just need to figure out why I have a like at idle.

Jason- 99' dodge 3500 flatbed, 2wd, 3.55's, nv5600, airdog 100
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post #8 of 14 (permalink) Old 05-14-2019, 07:26 PM Thread Starter
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Do you have hard starts/long cranks or white smoke at start up?
No hard starts or long cranks.

Jason- 99' dodge 3500 flatbed, 2wd, 3.55's, nv5600, airdog 100
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post #9 of 14 (permalink) Old 05-14-2019, 09:21 PM
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Quote:
Originally Posted by GRUNT 11B View Post
He is talking about RP. 17 KPSI is 17,000 PSI. The lift pump is not capable of 17 KPSI. Even if it was, it would blow lines and seals. The edge CTS2 cannot read fuel pressure unless you put one of their sensors (EAS i believe) in.
Yes, you are correct. My mistake since the OP stated he was monitoring "fuel pressure ".

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post #10 of 14 (permalink) Old 05-15-2019, 07:36 AM Thread Starter
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Not worth it

Jason- 99' dodge 3500 flatbed, 2wd, 3.55's, nv5600, airdog 100

Last edited by Jrollings; 05-15-2019 at 07:41 AM.
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post #11 of 14 (permalink) Old 05-15-2019, 10:24 AM
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You're close, I'd say your IP is just showing it's age a little, my RP is 7K @ idle and 26K @ WOT with a fresh IP.
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post #12 of 14 (permalink) Old 05-15-2019, 04:17 PM
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I think the 2003 have lower idle rail pressures that the later model trucks. I have a 2003 and mine is about the same as yours. Occasionally I see 5.1 and never over 5.6 at idle

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