what is proper fuel rail pressure

[Kedzierski]

What is the proper fuel rail pressure on 2003 Dodge ram?

 

[HHhuntitall]

It's a somewhat relative term, they all vary quite a bit. But at start up, they should be in the area of 2500-4500 psi. At full throttle, they'll go up to an area around 28,000 psi. I've seen them go all across the board, though. IF they go up over 28,000, they'll usually blow off the high pressure bypass/relief valve in the common rail, then they are hard to start, and don't have much power. That's when you call Geno's or Cummins and order a new rail or bypass.

 

[BBRam]

Idle between 5000 & 5500. What other #'s are you looking for (cruise/wot)? And with or without the aid of a pressure modifier?

 

[TCDiesel]

At Idle In P/N 5200/5400 , In Drive Foot on Brake 5700/5900. WOT is relative to Mods conditions and operation, This is where every truck is NOT equal.

 

[Kedzierski]

At Idle In P/N 5200/5400 , In Drive Foot on Brake 5700/5900. WOT is relative to Mods conditions and operation, This is where every truck is NOT equal.

The most I ever seen on two different scanners is just under 16000psi. At idle is around 5500 psi.

 

[Kedzierski]

Idle between 5000 & 5500. What other #'s are you looking for (cruise/wot)? And with or without the aid of a pressure modifier?

My truck had long starts for a while and just last week it did not start at all. It looks like my FAV got stuck so I replaced it and now I see low rail pressure. What is strange is that my brothers truck is a 2003 ram HO and it has identical fuel pressure like my truck. He never had any starting issues. At full throttle the most we see in the two trucks is 15800 psi. I also had a chance to check my body 06 and he has around 6200 psi at idle.

 

[HHhuntitall]

I'm curious as to how you are reading your rail pressure. Many performance boxes run MAP fooling programs. If you are tied in behind your programmer, you will see what the computer is seeing, which is a lower number than what is actually in the rail. That's how a lot of the valves get blown; programmers run it up higher than it can take. Now for the start issues, many of the '03s had slow starts. There was a dealer Flash/TSB for that. I had an update on my '03 in '05 for the same problem. I've also noted that my '03 runs quite a bit lower than my newer trucks. I've had a TST on both an '06 and my '03, and an Edge Juice w/attitude on an '07. I'm not sure how accurate those are, but I know the two newer ones are up around 5500, but my '03 is around 4000 at idle. Anyone know if that is injector related/difference in 305 to 325?

 

[TCDiesel]

The most I ever seen on two different scanners is just under 16000psi. At idle is around 5500 psi.

5500 A little hi But OK,16000 is way low, either incorrect reading or something is wrong,What are the Boost Pressures at WOT.

 

[Kedzierski]

I'm curious as to how you are reading your rail pressure. Many performance boxes run MAP fooling programs. If you are tied in behind your programmer, you will see what the computer is seeing, which is a lower number than what is actually in the rail. That's how a lot of the valves get blown; programmers run it up higher than it can take. Now for the start issues, many of the '03s had slow starts. There was a dealer Flash/TSB for that. I had an update on my '03 in '05 for the same problem. I've also noted that my '03 runs quite a bit lower than my newer trucks. I've had a TST on both an '06 and my '03, and an Edge Juice w/attitude on an '07. I'm not sure how accurate those are, but I know the two newer ones are up around 5500, but my '03 is around 4000 at idle. Anyone know if that is injector related/difference in 305 to 325?

I have a 2010 snapon scanner and. 2005 Mac tools scanner. My truck has booth boxes still hooked up and my brothers truck has just a vanaaken 3. 2 box still hooked up. The 06 is stock. I just had my injectors rebuild and I was told that HO is the some.

 

[Kedzierski]

5500 A little hi But OK,16000 is way low, either incorrect reading or something is wrong,What are the Boost Pressures at WOT.

Tst on 1 and vanaaken at economy mode and boost is at 30+ no problem

 

[TCDiesel]

30+ Is good I Don't think you could hit that with only 16000Psi 30+ @ 16000Psi would smoke out the sun.

 

[Kedzierski]

30+ Is good I Don't think you could hit that with only 16000Psi 30+ @ 16000Psi would smoke out the sun.

you are 100% right about the smoke. What do you think i should do to fix it? I swaped an high pressure relief valve and no difference. I check the return line at idle and no fuel leaks out of it. My brothers truck with the some rail pressure does not smoke. His truck is also ok on fuel. My is a pig compered to his even when i drive like an grandma.

 

[TCDiesel]

Unplug the Pressure sensor with truck running, it should Die,Report back.

 

[TCDiesel]

What lift system (Pump) and what is the feed pressure.

 

[Kedzierski]

Unplug the Pressure sensor with truck running, it should Die,Report back.

is that fca on the cp3 or the sensor on the rail? i am using a fass hd -150 and making 21lb steady.

 

[Kedzierski]

Unplug the Pressure sensor with truck running, it should Die,Report back.

take a look at this post i did when all this started

https://www.turbodieselregister.com/forums/truck-911/227231-fuel-mpg-problem.html

 

[TCDiesel]

OK. . I read most of it,1st 20psi is to much,Eventually it gonna cause problems. Remans (injectors) are problematic,CR are extremely touchy,10 things could cause your rail pressure loss,couple combinations involved and the diagnostics becomes much more in depth. Any company that selling direct feed pumps and telling their customers that for every day use 20psi is recommended DKS about the injection system on CR. Increase lift for added HP only. I don't think this problem can be resolved by typing,its gonna require Phone calls.

IMO CR Injectors need to be check in the host engine,Sending them to be check and balance is not worth the effort,time or cost.

 

[TCDiesel]

T&C Makes 3 times more from Reman Injector(s) and they Only come with 90 warranty,I just sold a New set of Bosch CR 503s to a customer that had 5 sets of Reman CR R/R from Injector Warehouse beginning April 2010,This is a real nightmare for this owner B/C when He returned the last set and demanded a refund they gave Him the refund on the cost of the Remans only and said that they have NO cores to return to him,So Now He's has a core charge from US,Hopefully IW comes through and return the cores to Us or He is SOL.

 

[Kedzierski]

T&C Makes 3 times more from Reman Injector(s) and they Only come with 90 warranty,I just sold a New set of Bosch CR 503s to a customer that had 5 sets of Reman CR R/R from Injector Warehouse beginning April 2010,This is a real nightmare for this owner B/C when He returned the last set and demanded a refund they gave Him the refund on the cost of the Remans only and said that they have NO cores to return to him,So Now He's has a core charge from US,Hopefully IW comes through and return the cores to Us or He is SOL.

i did not get reman injectors. I sent my injectors to BD diesel and they had them rebuild and flow matched with new 90hp nozzles. I am planing to take them out and have them cheeked. Truck only has 78000 miles.

 

[TCDiesel]

After dealing with 1000s of Remans,NO one has the technology to test CR correctly at this Time. (In USA) I hate the fact these companies are ripping off People. You can only check the volumes rate with the equipment companies have at this Time. I set One set of CR injector to several So call test facilities (I molested 3 out of 6) Not 1 company results were correct. I don't see How You can test CR Injectors without some type of meter explosion in order to check Post and pre Injection. Now each Injector would need to be tested at 3 different pressure settings,then check the return rates at several levels.