Fuel pressure question
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Junior User
Joined: Aug 2005
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From: Atlanta
Fuel pressure question
Thank you for all the great information on this forum. I have learned a lot by searching and reading the posts. My 2006 6.0 is now out of warranty and I am getting ready to do some of the upgrades recommend on the site. To get ready, I installed a DashDaq with a Zeitronix EGT and fuel pressure sensor. I have been monitoring my EGT/EOT/ECT for awhile. I have two questions. (1) My fuel pressure reading shows 90 psi on start up and it slowly drops to 44 psi in a couple of minutes. Does this sound correct? (2) Can someone comment on the BPD EGR delete versus the other deletes? I live near Atlanta and I like the idea that the BDP delete that will pass a visual. I plan to keep the EGR valve installed as well. I assume the BDP delete uses the stock up pipe with scoop, will there be any concerns with this? Many thanks
Lead Driver
Joined: Sep 2007
Posts: 8,180
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From: Scio, OR
Your fuel pressure is odd. Mine stays pretty constant from key on, through starting and running. It may be your pressure sensor/DashDAQ setup isn't quite right, or it may be a sticking fuel pressure regulator. It would be worth it in your case to rebuild the pressure regulator with the updated blue spring. You can search on blue spring and you'll find a lot of information.
I'm not terribly familiar with EGR deletes. Mine is still stock. I think the bulletproof EGR cooler is not a delete, though, but a replacement cooler. It still functions like stock, it's just a better built EGR cooler. So you should not have any emissions testing issues with it.
I'm not terribly familiar with EGR deletes. Mine is still stock. I think the bulletproof EGR cooler is not a delete, though, but a replacement cooler. It still functions like stock, it's just a better built EGR cooler. So you should not have any emissions testing issues with it.
Posting Guru
Joined: Sep 2009
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From: Virginia beach, VA
The BDP egr cooler is emissions legal and also has a lifetime warranty I believe.
As for your fuel pressure issue, I'm not sure why it is 90 at start-up but if it normally sits at 44 you should get the blue spring upgrade as David mentioned. Anything under 45 psi is supposedly bad for injectors.
As for your fuel pressure issue, I'm not sure why it is 90 at start-up but if it normally sits at 44 you should get the blue spring upgrade as David mentioned. Anything under 45 psi is supposedly bad for injectors.
Hotshot
Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
I would verify the fuel pressure reading with a manual gauge. What you're describing isn't right at all. The fuel pressure should remain fairly constant from key on to shutdown. Going from 90 to 44 is definitely not right. I'm sure Drewtech can give you the spec's on what the sending unit should be putting out.
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Junior User
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From: Atlanta
Thank you for the help. I had suspected the 90 psi was not right. I checked my install set up of the pressure sensor and I am fairly sure it is correct. The sensor install is in a Diesel Manor billet fuel filter cover with the sensor installed in the cover. I have a small fuel leak from the bottom of the regulator cover, so I had planned to do the blue spring update right away. Maybe the leak and pressure issue are related?
What type of mechanical gauge (for verifying the sensor) is safe to use under the hood?
BPD does have an EGR delete, as best I can tell it is their regular EGR shell and the exhaust passage is blocked. I was just curious if there were any opinions on the subject.
What type of mechanical gauge (for verifying the sensor) is safe to use under the hood?
BPD does have an EGR delete, as best I can tell it is their regular EGR shell and the exhaust passage is blocked. I was just curious if there were any opinions on the subject.
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From: Atlanta
Thanks for the help everyone. This weekend, I checked the wiring of the fuel pressure sender to the Zeitronix (which feed the DashDaq) and it was incorrect. After correcting the wiring, the fuel pressure was between 45 – 49. The pressure almost vibrated between these two readings. Due to the low fuel pressure and the fuel regulator leaking, I installed the blue spring regulator and now the pressure is a consistent 67 PSI. While I was under the hood, I pulled the EGR valve and check the FICM voltage. The EGR valve was dry and had a light to medium coating of soot. The FICM voltage was 48 without the engine running, but it was 43 – 44 with the engine running. I believe this is marginally acceptable. I assume I should keep an eye on it and plan on replacing it if the voltage gets much lower?
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Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
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Junior User
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From: Atlanta
After thinking about it, when I checked my FICM last weekend, I may not have had a good connection to ground. I retested the FICM today with ground lead attached directly to the battery. The FICM voltage was 48 without the engine running and it was 47.5 - 48 with the engine running. I monitored the FICM voltage with the engine running for several minutes and it stayed in this range. Based on this, I assume the FICM is OK?
Fleet Owner
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Just because folks have good FICM voltage does not mean that the FICM is good.
However, I can't see where you are experiencing any problems - are you?
If you aren't experiencing operational issues AND your FICM voltage is good (after correcting the ground issue), then I suppose there is nothing to worry about there.
Your fuel pressure is too low. Get it corrected.
However, I can't see where you are experiencing any problems - are you?
If you aren't experiencing operational issues AND your FICM voltage is good (after correcting the ground issue), then I suppose there is nothing to worry about there.
Your fuel pressure is too low. Get it corrected.
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Junior User
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From: Atlanta
Mark, I don't think so. The truck starts within 3 - 4 seconds of turning the starter over. No smoke or rough idle. I'll keep checking the voltage every couple of months. I added the blue spring fuel pressure mod last weekend and my fuel pressure is now 67 - 68 PSI. Thank you for the help.
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