campbellflage
Member
So your thinking there is 2 return lines one from the hp pump and another from the whatever the engine doesnt use in the 6.7?
6.7 fuel pump on 7.3.
- Thread starter dsberman94
- Start date
So your thinking there is 2 return lines one from the hp pump and another from the whatever the engine doesnt use in the 6.7?
Ron's Power Stroke
Member
that is how i read it... Fuel that is returned from the fuel rail combines with fuel being returned from the high-pressure fuel injection pump and passes through the frame mounted fuel cooler to the diesel fuel conditioning module.
campbellflage
Member
Ok but isn't the diesel fuel conditioning module on the return side of the pump? Thats how i understand it, depending on its temp it either goes back to the tank or rerouted back to the engine through the filter on the pump?
dsberman94
Well-known member
No. Read the red words. It says based on the fuel temp it either routes it through the conditioning module or straight to the tank. Not sure that means going back to the engine. I'm thinking it just bypasses a part of the filter portion and will go straight to the tank. You're the one with the pump sitting on a bench somewhere, check the thing out and see how it works so we can all stop guessing.
campbellflage
Member
Maybe we are not understanding each other, the DFCM is the fuel pump itself, so yes fuel is sent back from 2 different places on the 6.7 back the the DFCM and depending upon heat either sent down into the pump or back to the tank, where are we lost here thats what i have been saying.
dsberman94
Well-known member
But why would the conditioning module be on the return side when you want the water out of the system before it gets to the hp side of things. As far as I'm understanding the conditioning is what removes the water from the fuel?
I'm actually not understanding what temperature has to do with it actually.
I'm actually not understanding what temperature has to do with it actually.
Ron's Power Stroke
Member
:whs:
i believe its the water separator filter
i believe its the water separator filter
campbellflage
Member
The DCfm has 2 inlet 2 outlet, so feed and return, return an go back through the water separator or back to the tank, if their was no temp regulation and it just kept looping back to the engine could you imagine how hot that would get, at least if it goes back to the tank it mixes with more diesel and cools down a little.
In normal operating conditions (low demand, low temps) the system would operate as a continuous loop going between the LP pump, HP pump, injs. In events of very high return fuel heat (by product of high demand, engine heat rejection, heat caused by pressure), the fuel is sent back to the tank where its mixed to cool. In real cold temps, the circulation loop would be beneficial, avoiding this hot/cold fuel mix can eliminate tank condensation and water production as well.
We (7.3 guys) would greatly abbreviate some of the functions on this system. As we would use it, it looks like it would function similarly to an airdog with water separator functions.
We (7.3 guys) would greatly abbreviate some of the functions on this system. As we would use it, it looks like it would function similarly to an airdog with water separator functions.
campbellflage
Member
What he said.
Ron's Power Stroke
Member
too complicated for a 7.3 IMO..we don't pressurize fuel like a 6.7 so the only way for it to heat is fuel sitting in the bowl with the engine cover closing it in or by fuel passing though the heads with a RR...test has proven with a full RR and full tank of fuel that even in Florida/AZ heat, the temps do not rise enough to make a change.. by the time fuel gets close to being hot in a 7.3 its time to refuel anyways..
also have to think, the hotter the fuel is when going into the cold tank,the more condensation you will make..
also have to think, the hotter the fuel is when going into the cold tank,the more condensation you will make..
Last edited:
dsberman94
Well-known member
Only reasons I wanted this pump originally was for the amount of fuel flow and the water separator. I'd have an issue with using an air to air fuel cooler up here in the winter. I'd have instant fuel gel in it when it reaches 0* outside in the winter.
campbellflage
Member
This truck has a reg return, even if it circulates closed loop, until the fuel gets hot enough to go back to the tank, who cares it's not hindering performance and would be a benefit I would think, can run huge injectors with what might be basically a double feed pump (tank pickup, and return side loop). Either way, I'll post up how it goes, maybe toss in a temp sensor tied into the cts for measurements
campbellflage
Member
I can understand that, down here lowest temps are in the 30s, will I benefit from it, probably not, but it's not gonna hurt adding a cooler either.
Ron's Power Stroke
Member
maybe if i could understand why a 6.7 is set up this way it would help me understand it better,, is it for performance? or is for the EPA ??
swinky
New member
You 7.3 guys are a different breed. Why are you making this so complicated?
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Sent from my HTC One M9 using Tapatalk
campbellflage
Member
Idk, I was just going to hook it up and wing it
swinky
New member
That's what I did like 8k miles ago. No problems.
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