Return fuel melting fuel tank???

full pull

full pull

Sales&Support Valair Inc
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Jan 12, 2009
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Has any one heard of this, CP3 pumps very,very hot and fuel that returns to the tank is hot enough that it is melting the inside of the tank and plugs the FASS filters.
 
I have seen some other threads about this problem but I havn't heard anything ever come from the treads. I am no where near the level to worry about it but I have heard of this happening.

Joe
 
I haven't seen anything like this in 20,000+ miles on mine.
My pressure is boost regulated too...it hits about 80psi at WOT.
 
This is a twin cp3 set up with 2 dragon fire pumps on a 900+hp truck.

This will be the second tank that this has happend to, and this one went quick less than 3000 miles. We werent sure what happend to the first one, but after this it pretty clear.
 
Is it possable that these pumps would make so much pressure that it would super heat the fuel?
 
UNBROKEN said:
I haven't seen anything like this in 20,000+ miles on mine.
My pressure is boost regulated too...it hits about 80psi at WOT.
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He's talking about fuel returning to the tank after its already been through the CP3 not, supply pressure.

Im not to familiar with the CR Cummins but the Duramax's have fuel coolers in the return line to combat this. Maybe installing one or a bigger one would help.

Kinda OT, but is there a reason your supply pressure is 80psi? I was always under the impression, just providing positive pressure was all that was needed to properly supply the CP3. Any advantages that you've noticed?
 
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this might work for a fix run the return fuel though a cooler before it enters the tank
 
Yes we coud run it trough a cooler, but should it be getting this hot?
 
all it takes for the return fuel to boil is exposer...i have done many PLV tests and seen the fuel come out of the PLV smoking boiling hot so if thats the case that hot fuel is going into your tank...its possible.
 
I would not believe that for a second. The 6.0 ford diesels run the fuel thru fuel passages in the heads. If fuel returning from those engines does not melt the tanks I would never see it getting that hot in a cp3. You would certainly hear of the bargin push-loc hoses many use melting well before a fuel tank, yet never 1 word about that. And with the PLV tests most are conducted with very small amounts of fuel, therefore superheating the test samples.
 
Forget it, my fuel system has seperate returns for the pumps, and the return from the head has its own return.

That line from the head is pretty hot, the returns from the pumps, hardly warm.
 
Does the CR still have the return on the back of the head? If so and for some reason your only sending that back to the tank, then it could be hot, but I can't see the small amount coming out of that being dumped into a 30 gallon tank raising the temp of the fuel in the tank that high.
 
are you running low fuel levels? fuller tank may help keep it from happening, less recirculation of the fuel leading to lower return temps. or are you running a fuel cell? fuel cell fix would be a coil of metal fuel line submerged in a 5 gallon bucket of ice before it gets to the fuel cell.
 
zstroken said:
Does the CR still have the return on the back of the head? If so and for some reason your only sending that back to the tank, then it could be hot, but I can't see the small amount coming out of that being dumped into a 30 gallon tank raising the temp of the fuel in the tank that high.
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CR's still have the return from the head, and that fuel is pretty hot, But very little flow, and I run that down the factory steel line, (by itself) the reason being that's the fuel I want to cool.

The fuel return from the pumps is only slightly warm. (At least on my truck)
 
full pull said:
Has any one heard of this, CP3 pumps very,very hot and fuel that returns to the tank is hot enough that it is melting the inside of the tank and plugs the FASS filters.
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Your saying that liquefied plastic (or whatever material fuel tanks are made of) is plugging filters? I find that very hard to grasp?
What exactly are you finding in the plugged filters. Maybe you have an algae problem?
 
ok so the fuel is so hot that it melting the plactic tanks away, well the material the tanks are made of is going threw your fuel pump your filter and your cp3 pump right back into your motor, if it was me i would find a way to lower the fuel temp it might end up damageing something expensive plus i dont think you want the plactic going threw the pump or injector pump.
 
Snedge said:
Your saying that liquefied plastic (or whatever material fuel tanks are made of) is plugging filters? I find that very hard to grasp?
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You PA folks...
Lets see the pieces are bigger than the openings in the filter media so they won't pass through. Get enough of them and they block the media.

Do you grasp that now. LOL

If you need more explanations let me know. LOL


Sorry Jeff, had to!
 
zstroken said:
You PA folks...
Lets see the pieces are bigger than the openings in the filter media so they won't pass through. Get enough of them and they block the media.

Do you grasp that now. LOL

If you need more explanations let me know. LOL


Sorry Jeff, had to!
Click to expand...

Can you draw us some pictures please???:poke:
 
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