Now that the 2005 has an in-tank fuel pump, do we have to worry about running the tank so low that it could cause the pump to overheat/die??? I remember this being the case on some vehicles a few years back. Any ideas? Is this the first time DC has put an in-tank pump in the CTD equipped trucks?

 

First time for DC to put intank pumps on the cummins diesel. Will it last longer, I hope so, only time will tell, It should since it does not have to suck fuel and it's immersed in fuel oil so it shouldn't over heat. By the way overheating was never a problem with the old style lift pump on the engine. Failure was due to having to suck fuel 8 feet when a electric pump is designed to push rather than pull fuel.

I would think with an intank fuel pump it is a different type. Do not know but research and time will give the answer to that question.

 

I pulled out 3 intank pumps last weekend while doing the vent mod. To me they do not look like anything special and can hardly believe the mighty Cummins is happy being fed by it.

 

Juicedcummins,
Did the pumps need to pulled because they failed or because of the vent mod?

What is the vent Modification?

My understanding is the pump is a low pressure pump, 6 psi or something simular.

 

None of the pumps pulled had failed. They are part of the fuel level assembly that you have to take out to do the vent kit.
The vent kit raises the vent to the highest point on the tank and in turn gives you more fuel in your tank. It also gives you much faster fill ups with a properly vented tank. On my sb I could only get 125 Liters before the mod after a lot of screwing around.. Now I can put in 145 Liters and only 3 of those are after it clicks off. [145 liters was bone dry.]
I am sure it was on this site before if you do a search. If you can not find it search the TDR for fuel tank vent kit.

 

Juicedcummins -
When you had the 05 pumps out, could you tell if they would work as a direct replacement for the 03-04.5s? I know that wiring would have to be run back to the tank, but curious about the fit into the tank. Am considering doing the Holley pusher mod, but if the 05 pump will work, would rather go that route. Opinion?

 

Another big reason pumps fail is because of the many restrictions in the factory fuel system.
Putting the pump in the tank will help but it still does not address the skinny lines and bottlenecks the banjo bolts produce. A bigger banjo bolt does not eliminate the bottleneck, it just makes it bigger.

The dealer here had one bad pump in an 05...nothing to do with a failure...simple a dud from the factory.

Pushing from the tank has some merit but not as much as one would think. Its more ecnomical for DC to put the in-tank pump then it is to change the lines and get away from banjo bolts.

I sure do like the idea of the vent kit...where can I get one? You speak of liters...are you in Canada as well?

Scotty

Edit: I keep forgetting the biggest issue...fuel quality...that really kicks the pumps hard. How is the in tank pump protected from picking up debris in the tank?

 

The 05s with the LP in the tank haven't been out long enough yet to get a feel for how reliable it is.

I'm not sure how you guys can say that they weren't failing because of overheating or because of fuel quality, etc... the simple fact is that no one knows for sure. Otherwise there would be one definitive answer and one solution to the problem.

I think that by locating the LP in the tank it solves two of the three most common theories as to why the LPs fail. That being overheating and pushing the fuel rather than pulling it.

Time will tell.

 

Well the gasser in tank pumps failed at a somewhat high failure rate in my opinion.Usually higher mileage(75k to 150k) but we replaced a fair amount of them on a monthy basis.

 

If it comes to the point that the lift pump gives me problems I will just add one to the frame in front of the fuel tank like I did to my 99. For some reason two lift pumps in series seem to last a long long time. I know guys that were replacing lift pumps every 5-10 thousand miles before adding a pusher pump and after they are over 70,000 miles now without any failures or decreased pressure.

Hounddog,
by your post it would seem that you work for a dealership or service department of some kind. Could you tell me what the fuel psi is on the new 05 Dodge cummins with intank transfer pumps?

 

The intank LP just like gasser fuel pumps need the fuel to keep them cool. Run down the tank the pump over heats and causes problems. May not be today(although i have seen a fair amount quit immediately) but for sure shorten the life of the pump. Why take that chance?

 

JIMCTD, I have never had a tank off of an older 3'rd gen so I really don not know for sure if it would work. Knowing how cheap DC can be I would not be suprised if the lock colars are the same. If they are it could work.

The lift pumps on the 05's have a fine screen on the bottom. It has a big enough surface area to likely not be a problem.

Scotty you have a PM.

 

is the 05 in tank pump strong enough to fuel the higher horse units or are we going to have to put on a pusher pump as well, this task wont be easy with the in tank pump since i think the fuel is going to be regulated by the in tank assembly itself, the only other way to get more fuel out of this system in to steal fuel from the return line and reroute it back into the main pump. any other suggestions?

 

I know on the other truck I owned and I had a pusher pump I could disconnect the pusher pump and still get over 11psi on the oem pump, or dissconnect the oem pump and still get 16 psi out of the pusher pump.

Until the o5's start having lift pump problems I am not going to worry about it. the 05's have the factory warrenty and after what DC put me through on warrenty on my 99 this time I will just get a lawyer and let them fight it out. I will not loose my warranty on this one......Screw me once shame on them, Screw me twice shame on me.