i just installed my stage 3 pump, II works great, rock steady rail pressure of 5000psi at idle, seems to hold well on the hyway,i run the edge on 1, TST is on 1/1 and the smarty on 5. for some reason the truck quits all power when the rail hits 25,000psi
i just installed the smarty for the first time tonight, wanted to play a bit, but it pulls real hard for seconds, then falls flat on its face, once pressure goes down, it picks up again. what gives?
i have no instructions with the pump, it looks like there is some sort of relief valve on the pump.is my stock relief shot? should i remove the edge altogether?
not sure where to start, since i don't know how the stage 3 pump works.anybody? help?thanks

 

Sounds like a faulty FCA

 

i see in you sig that your rail is caped, what is that?
and how much different is the floor it stage 3 from the II stage 3 i have?
i noticed with my install, nothing was the same, the stage 3 is a different animal from the stock one i pulled out.mounts the same, but thats it, fittings are in different places, i could use my dual line kit, it wouldn't fit, and the fitting i have is different, doesn't go into the pump deep enough. do i even have the right pump?there is nothing in the box telling me what i have, or instructions, not even a sticker.

 

I heard the II Stage 3 is a Dmax pump.

 

I believe I read that the stage 3 II is 230 LPM and the floor it stage 3 is 270. Basit twins is like 340 I think. Anybody got a better guess on the industrial units?

 

yep its a Dmax pump thats why the fitting are differant. The rail cap is the banjo bolt on your rail i replaced it with a cap, so it doesnt pop the valve under pressure.

 

can you tell me how to do that?
also, i have an update, i took the smarty out of the picture, and ran it with the TST and EDge.edge still on 1, tst on a couple different settings.if i floor it, it pulls hard, usually get a shift in there, then it just falls flat on its face.i watched the rail pressure, and it doesn't seem to matter where it is , but usually around 20,000-25,000psi.
it did this numerous times, and i cant go hard, or go from a wot and keep going, it just quit pulling, making power, until i let off, give it a couple seconds, then i can get back on it, and it will do it again. it seems to do it when i kick it down like going to pass hard. if i roll on it in over drive, it seems to be ok, bit thats not wot.i don't know if this is a tranny related problem, or a pump problem, maybe head gasket problem? i don't know enough about these trucks. i know when i changed the pump, my coolant res was empty, rad was full.i haven't checked it since changing out a upper rad hose about 2 months ago.what ever i put in there when i changed it, it could have sucked that up.not sure how to test for a head gasket failure, only way i know is to pressure test at the rad cap, pump up to some pressure, and let it sit for some time.
i still don't know why i can't use the dual line kit with my pump, they sell it,should be able to use it, unless i need different fittings, but i don't see how it would fit, i couldn't get the pump started on the studs with out the fitting i had to moddify getting in the way of a bracket on the block, just ahead of the ecm.

 

to add to that, it feels like it just ran out of fuel, no poping or anything, but my low ful pressure is still good around 15-16 psi, and the rail seems to be around anywhere between 18,000-25,000psi when it does this.
i would think it would show on one of the gauges if it ran out of fuel, which i never had a problem in the past with that, but never used the smarty until now.makes me think something isn't right with either this pump, or a check valve/relief valve, injectors, or my motor is no good. doesn't over heat, seems to be in the norm temp range, runs good other wise.i don't remember this being a problem with the old pump, but the old pump was no good as it was jumping up and down in pressure, sometimes at start up it would start, and fall past the 3000psi, and die, would have to re start and it might do it again, or it would just bounce around but stay running.
not sure what other info i can give here.kinda stumped.

 

i just tried the truck on stock, no programming, and rail pressure went as high as 26,000psi, did the same thing, seemed to pull longer before falling flat on its face, had a little bit of popping out the tail pipe.
i am not sure what i should be looking for, but maybe my stock injectors are no good? getting too much fuel for what they can handle?
if my relief valve on the rail was no good, wouldn't it do this at a certain psi?

 

When's the last time you changed your fuel filter? I know I had the same issue before with popping out the tailpipe and loss of power then it would pick back up. It ended up being the fuel filter. I would also look at your oil and see if it has any fuel in it. If there is something seriously wrong I would not be driving it at WOT trying to figure out what it is. Usually when the head gasket goes you will get oil in the radiator depending on where it blows. With the popping and stuff it sounds like you have a fuel related problem. You also could have got a bad tank a fuel and clogged the fuel filter. I've done that before to but that bad tank of fuel also contributed to loss of injectors.

 

Without the dual feed line in place you need to cap your relief valve orfice off...The relief valve is doing what it is suppose to and popping open at around 27.5kpsi...the more you pop it open the lower the pressure will be that it will start to creep open and then it will leak and then you are fubared... No instructions from II....I'm shocked...but that is a whole different story. You need an adapter to go into that pump with your existing dual feed line...They have one at II. If you didn't ask for it they wouldn't clue in to provide it....probably something between $40 and $120 bucks. Good Luck....KS....ps You won't be able to sledpull in some jurisdictions as that pump is not the original pump for that truck....that is why Floor-Its pump is the cats butt. KS

 

i run 2 fuel filters, and both were changed about 2 weeks before i got the pump, they should be good still.what is every body running for fuel pressure to their modified CP3 pump? i have been told 2 different things with that. right now i see about 16-17psi on the low side.

 

BTW how do i cap off my relief valve?what do i need to do it?

 

You can tap the bottom of the banjo bolt and plug it,but I would order the rail cap from Floor It.Just put mine on last week,cap looks identical to the relief valve but has no hole thru it.Simply remove the RV and install the cap and put the return line and banjo bolt back in the top.

Your fuel pressure is good.Shouldn't need anymore than your running

 

Tha floor it one is cheap when you consider that a dual feed line is like $300 and so is a new relief valve. Tha cap is like $60 sumthin or less