Is there gonna be much difference which setup I go with if I plan to one day do the cp3 mod. I had read somewhere that it the fass might not keep up. Anybody have the specs on what relentless cp3 setup requires?

 

I keep reading that the modded CP3 requires 40psi. Not sure why they`re wanting that much pressure and giving no volume requirement, but thats what I`ve heard.

I`m not going to start another war on this subject, IT IS MY OPINION that the Walbro will flow alot more fuel at 40psi than the FASS will. That may not even be an issue, but I can`t see the CP3 only needing more pressure and not requiring any more volume, so I`m assuming it is.

 

The 40 psi at provides the needed flow thru the stock lines to meet the CP3 flow requirements. We have no easy way to measure actual flow so psi is the easiest to use for a target number. If you upgrade the fuel lines you can probably get by with less pressure.

Any pump system that will provide the flow will work; FASS, AirDog, Walbro, or your favorite pump. What I am looking at is the extra abilities of the system plus the time and cost of installing it.

The FASS/AirDog is a complete system that includes filtering, bypass, and air removal. This all happens close to the fuel tank and out of the heat soak conditions under the hood.

The others are a pump only. Filtration, bypass, and plumbing will all have to be fabricated. Entrained air will not be removed and will only get worse as there will be more fuel bypassing than being used most of the time.

Either system will work with each having its pros and cons.

 

With no way to measure actual flow I would be concerned with the over all performance of the system at 40PSI and ????flow. What you are saying is that the FASS at 40 PSI will provide the requirements of the system for lubrication and fuel delivery to the Rail. Yet you are unsure of the actual requirements needed for proper flow and lubebrication.
How much fuel does the CP3 require for proper operation of the engine and how much for cooling and lubrication of the CP3?? If those answers cannot be answered then we are in trouble.
From what I gather the modded CP3's are using higher inlet pressure to boost over all out let pressure. With the mod of the larger pistons on the high pressure side. Yet with no mod being done on the low pressure side of the pump. Hence why a higher pressure demand from the lift pump.

Hope I didnt **** any one off. But when some one says use this and this but wont or does not have the charateristics of said iteim then I begin to worry.

Cheers all

 

The FASS will provide enough flow at 40 psi at the pump inlet thru the stock lines to feed the Stage 1 CP3, injection fuel and cooling/lube. If you change the line size between the FASS and CP3 it will be less than 40 psi. If you add more restrictions, as in filters, it will be more. Pressure equates to flow thru a fixed restriction. As far as how much is needed, thise figures are not readily available for the stock setup let alone a modded one. I gather that John and crew have arrived at this number by extensive testing so in the absence of any others it sounds pretty close to what it should be.


Well sorta. The higher inlet pressure provides the flow to be able to keep up with the rail demands. The input pressure has no bearing on output pressure as long as the volume is there to prvide enough fuel for the FCA when the ECU says crank it up. If you had a large enough supply line you could have 10 psi and it would still work.


How about the reccomended supply pressure for the Stage 2/3? 80 psi!

 

We will have a pump for any application of CP3 Mod....

Typical Life span is 10-15,000 Hrs on these new motors. Here is the flow chart on our pumps......

The ones that have been out since 2003 with the serviceable brushes and the units with the non-serviceable brushes:

95 gph unit:

0 psi 84 GPH
10 psi 72 GPH
20 psi 66 GPH

150 GPH unit:

0 psi 150 GPH
10 psi 138 GPH
20 psi 126 GPH
30 psi 114 GPH
40 psi 96 GPH
50 psi 72 GPH

The new units that have the Larger/Higher RPM motors:

95 GPH unit:

0 PSI 102 GPH
10 PSI 96 GPH
20 PSI 96 GPH
30 PSI 90 GPH
40 PSI 90 GPH
50 PSI 90 GPH
60 PSI 78 GPH
70 PSI 78 GPH
80 PSI 78 GPH

150 GPH Unit:

0 PSI 210 GPH
10 PSI 204 GPH
20 PSI 204 GPH
30 PSI 198 GPH
40 PSI 186 GPH
50 PSI 180 GPH
60 PSI 162 GPH
70 PSI 156 GPH

 

The Relentless Diesel cp3 stage 1 mod which made 86 rwhp was made with a fass 150 at 15psi.There are some more upgrades coming which do require more psi from the lift pump,if I were to tell you which pump to buy,I would buy a rasp,its quiet and it will exceed any psi you might ever need.

 

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FASS comes with a 4 year, 400K mile warranty. Pretty easy choice.

Nice flow numbers on the FASS BTW.

 

When someone pipes up and ask whats the required flow rate for a modded cp3 I just shake my head. Why doesn't that someone get a wrench and undo their stock fuel line into the cp3 and measure the flow with a marked volume container. Do the math and you have your answer. I did with my fass 95 with filters hooked to the cp3 directly and then changed to the stock filter housing. The fishing for flow rates and pressure are just numbers so that someone can spew off. A lot of men have spent serious time tuning, (time/money) so why is it so important for someone to know?

 

HUH....as far as i know....we have no mileage requirement....

 

I would like to know . if your telling me it flows more , how much. I am not going to check because I am not seliing it. anything I sell I can assure you ,I know what it does.

 

So you want to know, measure the flow yourself. I'm not going to tell you what my flow is, all trucks are different, I'm not selling anything. I am not trying to be a jerk on this. I've spent the time finding the stock oem pump flow and pressure numbers and cp3 requirements stock flow. I also had diesel running up to my armpits and many hours tweeking my fass setup. My truck is my hobby/obsession.

 

You might want to consider this:

Mitusa Mechanical Lift-Pump! It Rocks!!

 

Your test did not tell you how much fuel the stock CP3 needed only what your FASS puts out. The only way to test the fuel requirements for CP3's would be a flow bench like Industrial Injection has.

It's important to know so you supply the new pumps with enough fuel. They will put out more fuel than a stock pump.