Had a performance problem

[TCDiesel]

A couple years back, I lost my FASS on the way back home... drove over 2100 miles without a lift pump, highway speeds, 1000#s of brick in the bed, from Washington to Pennsylvania. That was probably around 210k, I sit with over 266k on the ORIGINAL CP3 THE TRUCK CAME WITH FROM THE FACTORY (and the last 100k with a Smarty JR).



I guess actual experience doesn't matter? I know when I sell this truck in a month or so, I will not miss your holier than thou posts one bit.

I remember the Thread... Their are tens of thousand of pumps running without No lift,Your experience proved Nothing that was NOT already achieved, depending on setup You do NOT need any lift as long as the setup has a priming ability.

 

[TCDiesel]

Eh? Your too kind. I think I know what he is trying to say but it would be much easier reading if he could just SAY it in plain language. :-laf







Talk to the Dmax guys and pump rebuilders about how that works out, its not that great. Addition of an LP used to be worth 20-25 hp and they quit eating pumps up at an alarming rate.



The Dmax setups have larger fuel lines, the CP-3 sits in a much lower location in relation to the fuel tank, and they have a different gear rotor pump that is supposed to accentuate the no LP design. Its not a fair comparison to the Dodge\Cummins installed design.



I think what Todd is trying to say is by the time performance has been effected and noticed the CP-3 has been short of lube and cooling for a much longer time.



A lot will depend on your filtering. If your running the typical FASS filters and OE cartridge and plugged them you have probably run a LOT of crap thru the system in addition to lack of cooling\lube. If it was true 2-3 um filter then all you have to worry about is the lack of cooling and lube. Either one is a death sentence on an HPCR pump.



I am surpised you did not see the pressure drop at the CP-3 or rail pressure drop sooner.

I agree. . but what can happen is the CP3 will feed the Injection side 1st. . when Modding the COV or failed COV plays heavily Here.



The Way Yo Hoot watches his gages I am sure any + or - would have alarmed Him.

 

[cerberusiam]

I agree. . but what can happen is the CP3 will feed the Injection side 1st. .

Yeah, that little item is too often overlooked in the whole scheme of things and eventually bites. Even if pressure is good it could be running at partial circulation and no problems are indicated.

 

[TCDiesel]

I am not to concerned with the lack of Volume, as opposed to those filters He's running were Plugged, I wonder what may have made it by, In all likely hood its rare a 1 time problem should effect possible Damage,But this is CR and you can never be to cautious.

 

[cerberusiam]

A couple years back, I lost my FASS on the way back home... drove over 2100 miles without a lift pump, highway speeds, 1000#s of brick in the bed, from Washington to Pennsylvania.

Yes, both the FASS and AD will draw thru, much better than the OE setups. Their design, mounting position, and fuel line size actually enhances a siphon\prime effect.



With good filters, typical conditions on a direct route your drove, and no noticeable performance issues its doubtful that 2100 miles would have an effect.



Thats not quite the same as hitting performance issues with a FASS installed and finding the filter to be the issue. You knew how long you drove, Yo is not sure how long or how bad the flow reduction was.



Like Todd said, what plugged the filter that bad and how good is the filter in reality are the pertinent questions. Big difference between plugging a 10 um as opposed to a 2 um is huge.

 

[Yo Hoot]

The restricted filter had 20,000 miles on it. I write the date and mileage on my filters with a permanent marker. You could get a bad load and clog a brand new filter instantly so it's hard to say. This seemed to come on gradual. I notice my pressure reading (from the port in the FASS) is 2 psi lower with the new filter so I'm thinking higher pressure shows restriction?

BTW on my Dmax I was running a secondary 2 micron Racor. Thing is I traded the truck at 75,000 miles and I'm guessing I had the filter on there for about 50,000 of them (changing elements of course). Whoever bought the truck probably had a bad experience since the filter was so hidden, mounted under the battery tray although I think I wrote a note in the owners manual.

I did hear the Dodge uses smaller fuel lines probably because they decided against the problematic suction design that Dmax used. A small air leak was trouble. Since they went with a lift pump, bean counters probably spec'd smaller tubing. Dmax changed to LP later did they not?

This is the filter I installed in the Dmax many years ago. .

#ad

 

[AH64ID]

For reasons like this I would move the pressure sender to a "T" fitting just before the CP3, give you a better indication of what's going on.

 

[cerberusiam]

This seemed to come on gradual. I notice my pressure reading (from the port in the FASS) is 2 psi lower with the new filter so I'm thinking higher pressure shows restriction?

So it was a downstream filter that plugged, not the FASS filter? What um rating was the plugged filter?



Like AH64ID pointed out, pressure read at the CP-3 inlet will show a filter plugging, as long as there is no bypass on it.

 

[Yo Hoot]

So it was a downstream filter that plugged, not the FASS filter? What um rating was the plugged filter?



Like AH64ID pointed out, pressure read at the CP-3 inlet will show a filter plugging, as long as there is no bypass on it.

The only filtration I have is the FASS. There is a port on the FASS for the pressure sender. I don't know where it gets it's reading. If it's before the restriction I can see where pressure might increase.

 

[steved]

The FaSS reads post filters... I scrutenized mine before installing.

 

[TCDiesel]

Pictured . . 1 over heated Piston ,1 new Piston. The Piston was removed form a Modded Pump that was NOT adequately cool. I rarely see this with factory pump,The failed Piston was form a pump that is now junk, Its was new with less then 300 miles according to the shop that installed and remove it. I will leave the details out,with the fueling requirements and big Nozzles and with new tuning available pumps are being pushed into new demands.



Factory pumps have internal restrictions to stop over heating if these restrictions are removed and not replace with other modifications they will fail.



I have received Many D-Maxs Pump that are over heated and fail, I rarely see this on Cummins unless the system is altered.



The road restrictions are Being removed at 12:01 tonight So My construction business will be starting this week I will not have much time for Keystrokes until fall, looks like the TDR will be getting a break.