Modded CP3 is on - Dyno and review:

[csutton7]

you don't need the marine version--I've been running the A1000 for 5yrs--it has the same ratings as the marine version--less expensive too, but still it's not cheap at $300--I will say that I've been 100% truly gravity fed for this period of time also and running an aeromotive bypass--I have -10an from tank thru an aeromotive filter then

-10an to pump and then -08 to a RACOR filter and -08 to the bypass and -08an to the vp and back to the tank---it's regulated at 19psi and stays between between 15 to 19psi no matter what I do, at idle there's a tremendous amount of fuel that gets returned to the tank---no figures but I can see it when looking down the fill neck tube when fueling up before I shut the truck off--I plumbed in a tee at the overflow line and there's so much fuel coming back that it comes out the overflow tie in at the fill tube... ... ... chris

 

[AEzzo]

you don't need the marine version--I've been running the A1000 for 5yrs--it has the same ratings as the marine version--less expensive too, but still it's not cheap at $300--I will say that I've been 100% truly gravity fed for this period of time also and running an aeromotive bypass--I have -10an from tank thru an aeromotive filter then

-10an to pump and then -08 to a RACOR filter and -08 to the bypass and -08an to the vp and back to the tank---it's regulated at 19psi and stays between between 15 to 19psi no matter what I do, at idle there's a tremendous amount of fuel that gets returned to the tank---no figures but I can see it when looking down the fill neck tube when fueling up before I shut the truck off--I plumbed in a tee at the overflow line and there's so much fuel coming back that it comes out the overflow tie in at the fill tube... ... ... chris

I just wanted to note for everyone that you are making 741 H. P. on approx 85 GPH.





on edit: How are you running a -10 line from the tank?

 

[Tomeygun]

I just wanted to note for everyone that you are making 741 H. P. on approx 85 GPH.

on edit: How are you running a -10 line from the tank?

AHH, but with a bypass system. Thats my beef is that the full FASS has a pressure bypass (not regulator) and my HPFP does not. And I think that will end up hurting my HP numbers.



If I have to I'll install a bypass and try two pumps, one internally regulated and one not regulated - And see which one get the highest HP. My moneys on the bypass system



I really can't believe I did not think more into this. Try running a barry grant fuel pump without a bypass, lets just say you wont get your moneys worth...

 

[csutton7]

punched a hole in the bottom of the tank and used a 90* bulkhead fitting cut down--chris

 

[csutton7]

you got that right on the Barry Grant--that was my first try and burned itself up in no time--then went to a Mallory 110efi pump (I think that's the right number) and burned that one up too--so then the hole in the bottom of the tank and thus far I've changed the aeromotive once--but it was due to stupidity on my part--thought it was going out so I set up the new one and had the original one almost out when I noticed the ground wire was loose---so since I had the new setup I shoved it on and the original is my backup---chris

 

[AMassaro]

Tomeygun, you should do some more research on Dtr and Cumminsforum. Tons of info and pics with those of us who have Walbro setups. Lots of different ways guys are doing this efi pump system. I have a simple bypass at the cp3. Others are running bypass regulators with seperate returns either going to the filler tube "tee" or using the old vent after the vent mod.

 

[Diesel Power]

This is just a question here but what kinda pumps did Wade and John use when testing the cp3's to rate the different stages? This may have been noted already though, just curious thats all!

the fass 150 @ 40psi was what we ended up at for the BEST RESULTS, it will NOT fall off as rpm increases Oo. ----untill other areas are looked at this set up is the only current recomendation. thanks

 

[AEzzo]

the fass 150 @ 40psi was what we ended up at for the BEST RESULTS, it will NOT fall off as rpm increases Oo. ----untill other areas are looked at this set up is the only current recomendation. thanks

Do you mean as pressure increases?

 

[Diesel Power]

i am going by what tommys truck did at high rpms----it fell off, because of lack of fuel, the modded fass will not do that. :-laf

 

[GWoody]

QUOTE

As the discharge pressure is increased the flow tapers off (it does not increase).



That is true, AS THE DISCHARGE PRESSURE IS INCREASED, or in other words restricting the flow, but we are raising the pressure at the pump bypass valve by modifying the spring which causes the valve to stay closed longer increasing the pressure and flow till the valve opens. An everday garden hose will flow more gph per hour at 40 psi vs 20 psi.

 

[Tomeygun]

Tomeygun, you should do some more research on Dtr and Cumminsforum. Tons of info and pics with those of us who have Walbro setups. Lots of different ways guys are doing this efi pump system. I have a simple bypass at the cp3. Others are running bypass regulators with seperate returns either going to the filler tube "tee" or using the old vent after the vent mod.

So you just have an open line at the inlet of the CP3? What stops the fuel from flowing right back to the tank?



I know that the recommendation is the FASS150, but what can I say, I like experimenting!



The longer I think about it, the more sure I am. I will call brad tomorrow and ask what the HPFP150 will do when un-internally regulated. Then I will borrow a bypass regulator from my uncles race-car parts bin and see if I cant piece together a inlet back to the tank (most likely the "tee" if it looks easiest).



This is going to be fun!!



PS - I was talking to another person with the HPFP95 and we both wondered why it is noisier than other peoples full fass system, well duh! - Deadheading always makes more noise - trying to push fuel when there is no where to go .

 

[AEzzo]

QUOTE

As the discharge pressure is increased the flow tapers off (it does not increase).



That is true, AS THE DISCHARGE PRESSURE IS INCREASED, or in other words restricting the flow, but we are raising the pressure at the pump bypass valve by modifying the spring which causes the valve to stay closed longer increasing the pressure and flow till the valve opens. An everday garden hose will flow more gph per hour at 40 psi vs 20 psi.

I agree with what you are saying but we are really not talking about flow through a hose but the flow of the pump. Spend some time looking at flow charts on the internet. The flow drops on all of them as the pressure rises.

 

[Jeff_K]

QUOTE

As the discharge pressure is increased the flow tapers off (it does not increase).



That is true, AS THE DISCHARGE PRESSURE IS INCREASED, or in other words restricting the flow, but we are raising the pressure at the pump bypass valve by modifying the spring which causes the valve to stay closed longer increasing the pressure and flow till the valve opens. An everday garden hose will flow more gph per hour at 40 psi vs 20 psi.

A pumps flow is directly related to the pressure of the system. Just because you are increasing the output pressure (by modifying the spring) does not mean it will flow more, it means that it will produce a higher pressure before it relieves to the bypass. The pump is still limited to its flow curve, and by increasing the pressure you are just moving the operating point on the curve.



The analogy to a garden hose is completely different. Of course a garden hose flows more volume when you increase the pressure of the system, its a hose, not a pump.

 

[Jeff_K]

So you just have an open line at the inlet of the CP3? What stops the fuel from flowing right back to the tank?

They was I understand it is the cp3 is going to take the fuel it needs, and the rest will flow back to the tank. Because the bypass line is small enough to keep pressure on the cp3, only the unused fuel goes back to the tank. A few guys have used needle valves in the bypass line to regulate the pressure at idle, but once the rpm increases and the cp3 demand is higher, the pressure will drop. For a stock truck this may be fine, but you want to use a regulator to try to maintain pressure at the cp3 inlet.

 

[AEzzo]

So you just have an open line at the inlet of the CP3? What stops the fuel from flowing right back to the tank?

Tomeygun If you went with a walbro you would not be able to run the bypass. You would have to run a bypass regulator. The bypass is only good on stock to very midly modded trucks.

 

[AMassaro]

Originally Posted by Tomeygun

So you just have an open line at the inlet of the CP3? What stops the fuel from flowing right back to the tank?



Two tapped banjo bolts. One on the inlet, one on the return of the cp3. 5/16" fuel line looped between them with pressure sender inline. The back pressure of the return line keeps my pressure up. On a heavily modded Cummins, like yours, I'd definately go with a bypass regulator with seperate return line. Should be able to keep whatever pressure you desire at the cp3 with that setup...

 

[Tomeygun]

Tomeygun If you went with a walbro you would not be able to run the bypass. You would have to run a bypass regulator. The bypass is only good on stock to very midly modded trucks.

Two words:



GAME ON!



nothing quite like the sight of the return fuel flowing in like a garden hose... (its a drag racer-fuel-cell-in-the-trunk thing is guess :-laf )

 

[MCummings]

Speaking of other stages, Let me say that I think the p-pump has its days numbered... .

You haven't had personal experiance with a really modded P-pump yet have you ? :-laf





However, this ISB-e stuff is the way to go for a street driven hot-rod...



Kinda like comparing a Carb. setup to an EFI setup... (P-pump vs. HPCR Pump)





Merrick

 

[Tomeygun]

You haven't had personal experiance with a really modded P-pump yet have you ? :-laf

However, this ISB-e stuff is the way to go for a street driven hot-rod...

Kinda like comparing a Carb. setup to an EFI setup... (P-pump vs. HPCR Pump)

Merrick

Heck I wish I had bought the 97 that came through Lou Fusz Dodge about a year ago, Kick myself everytime for not snagging it for the 8k the guy wanted...



Honestly though, after seeing some of the Floor-it diesel skunk-works (like the stage 4 that John mentioned yesterday), I see no problem with making more power than even a heavy modded P-pump...



I might have to eat my words, but man I'm tell'in ya, that stage 4 was - just crazy!, you know that kind of size that makes you wonder if there will ever be a truck that can run it?

 

[MCummings]

Tom, Hopefully you are right!



That would be something else to see the HPCR's out doing the P-Pumper's.





So,,,, When are we getting bigger rails and lines? heheh



Merrick