2006 Dodge Ram 3500 - Thor Project

[Tractorman]

35 minutes ago, Doubletrouble said:

 Also, what is the preferred pressure from the lift pump? 

 

Pretty much the same as our VP44 engines.  When my VP44 replacement and in-tank lift pump mod was done by the dealer under warranty, it was replaced with the same in-tank pump that was used for the common rail system.

 

35 minutes ago, Doubletrouble said:

This would cause me to question pressure and or volume from the lift pump.

 

I agree - that's why I am recommending temporarily plumbing the lift pump to a remote fuel container and then going for a test drive.

 

- John

Edited February 12 by Tractorman

[Doubletrouble]

9 minutes ago, Tractorman said:

 

I agree - that's why I am recommending temporarily plumbing the lift pump to a remote fuel container and then going for a test drive.

 Yes, I saw that. It may be worth looking into. Would low lift pressure cause the fluctuation that he is seeing? I don't know but, any fuel starvation is bad. Also, could there be air in the fuel. Bubbles would certainly cause dips in pressures. Obviously that would be isolated to the suction side of the lift pump. Anything on the pressure side would be in the form of a leak.

[Tractorman]

10 minutes ago, Doubletrouble said:

Would low lift pressure cause the fluctuation that he is seeing?

 

It is possible.  I have worked on a few common rail Dodge Cummins engines.  What I have found is that it can be very difficult to troubleshoot this fuel system, even with the use of the right diagnostic equipment.  You may be fairly certain that a high fuel return rate is occurring, but that could be caused by a leaking PRV, a CP3 pump, one or more injectors, crossover tube / tubes not seating, etc, or even a combination of the these.

 

It is for the above reasons that I would want to prove (which can easily be done) that there are no issues with fuel supply, first - then move on to other diagnostics if the fuel supply is good.

 

One thing for sure..., if there is a problem with the fuel supply, then the high pressure part of the injection system cannot run right.

 

- John

[Mopar1973Man]

So. I'm going to chase a few different things here. First off I've already talked to @dieselautopower about this and got a clue. So the over pressure valve is a serviceable item which is possible it's leaking DAP has a rail plug to block that possible leak and see if there are any changes. NAPA wants $417 for the valve then DAP can do much better under my vendor side.

 

I called another member @towhungerford and chatted about this issue and he's agrees the over pressure valve could be leaking. This could affect restart because air could be introduced by the return rail. 

 

Personal note...

Sadly today it was like +7°F this morning. I just done with my 6 month check up. My back is killing me found out I've got L3 and L4 compressed and 1.5 inch shorter now. No cancer found but still fighting with my kidneys.

[Doubletrouble]

 Glad to hear you cancer free @Mopar1973Man! Chiropractor for the spinal compression? 

[Tractorman]

1 hour ago, Mopar1973Man said:

today it was like +7°F this morning.

 

8°F below zero at my house this morning, 20°F below zero at the airport reporting station (National Weather Service).

 

- John

[Mace]

You could also fuel field the cp3 and watch it hopefully make full pressure.

 

[Mopar1973Man]

22 minutes ago, Mace said:

You could also fuel field the cp3 and watch it hopefully make full pressure.

 

No problem grid heater light pops on it locks to 19k to 20k rail pressure cruising faster than 40 MPH. 

 

25 minutes ago, Tractorman said:

 

8°F below zero at my house this morning, 20°F below zero at the airport reporting station (National Weather Service).

 

- John

Everyone here is like nope stay in day too cold to mess around as well the sun is heading down, shadows are coming, temperature already failing. Try again tomorrow.

 

Yes I know date and time are wrong. 

Edited February 12 by Mopar1973Man

[Doubletrouble]

We are currently experiencing freezing rain. They're calling for up to 1/4 inch of ice.

[Mopar1973Man]

Might get out today and work on Thor...

[Mopar1973Man]

Now on Thor i went through and for sure torqued all crossovers to Industrial injection specs of 44 ft/lbs and then added 4 more on a second pass on torque. 

 

Now...

 

I need the chime list for sure. Drove the truck runs way better and more power. Still extremely long starting and loss of prime instantly. Turn off the engine and prime is gone instantly. Also my repaired injector #1 is now tossing P0301 code misfire cylinder one.

 

Chime list - 1, 5, 7, 8, and 10 chimes with grid heater light. Every cycle I would either clear the light with my code reader or it would self reset just idling.

 

I've call Industrial Injection only thing he's will do is sell me a entire fuel system for $4k. Nope not happening.

 

Alligator performance was helpful but no clue on chimes or meanings. Again just would sell a full fuel system, injectors, cross over tubes, cp3, and rail pressure sensor with relief valve. 

 

I'm looking for that chime list.

 

Now @dieselautopower I talked to Lenny and he's going to retest everything for me again being this is the 4th time pulling these injectors in under 1,000 miles.

Edited 16 hours ago by Mopar1973Man

[Mace]

You replaced the rail prv?

 

 

[Mopar1973Man]

2 hours ago, Mace said:

You replaced the rail prv?

 

 

No need when no fuel is leaking out. If you can remove the banjo bolt lightly tweak the line a little and fire it up and watch the PRV top for any changes. No leakage of fuel.

 

Oh just fun to now have a 3 chime grid heater light. I WANNA KNOW WHAT THESE CHIMES MEAN. 

 

As for what I've done today.

 

Mark was a huge help getting the a frame out and then getting the bed cut free from the frame. You have no idea how wild it was to keep lifting the bed and watch the weight transfer and seeing the natural rake of stance return. That bed is farking heavy! Those rear spring had alot of weight. 

Edited 10 hours ago by Mopar1973Man

[Doubletrouble]

 Is it possible that you are pumping aerated fuel from the lift pump to the injection pump and that is causing the loss of prime? Somehow the lift pump could be sucking in air as it also draws fuel and sends it on its way full of bubbles which would facilitate a rapid loss of prime.

[Mopar1973Man]

Great minds think alike. I just filled Thor rim full with 98 dollars of fuel and got the bed off and its dry up top of the module and pump is drowning in the tank.

[Doubletrouble]

 That should eliminate it from drawing in any air then.