First i just edited my signature so everything is current. After reading my sig. does anyone have any suggestions as to where i am loosing my rail pressure? I rarely see my rail go over 15000 WOT no matter my smarty setting. It does spike to 25000 26000 right after i pull out but no matter my settings i cant keep enough rail... thoughts??? after i swapped my FCA for a modded one from floor it i could hold more rail before i would never see the spike to 25000. rail cap didnt seem to change a thing. feel free to quiz me on possible ideas...
Two ideas i have...
1...Weak CP3 but at 65000 miles i would hope not.
2...Injectors letting too much fuel go back to tank. anyone know how to test this? i have heard of people testing it but i havent every found how to do it.

Other tid bits i have tried numerous smarty tunes and diiferent levels on the mp-8

 

I would be leaning towards the cp-3 being bad,possibly the cascade overflow valve.Did you describe your problems to John at Floor It?Dealer can do a return flow test.Being you haven't messed with your injectors I doubt there is a seating issue with the connector tubes.How does the truck run at idle and while driving.

 

I don't see injectors in your sig, are you still running stock sticks. I see 26k with my stock cp3. I do have bigger sticks just don't know how big.(were in when I purchased truck).I do run the rail dry but not untill I get up high in the rpm. If it was me I would send out my cp3 and have it checked by Floor-it or another good pump shop.

 

homewrecker runs great i can just tell that im missing fuel for optimum hp. any way i can do that return flow test? just get the number i need to compare from them? or is it too hard. i just hate the automatic 150 bucks i drop it off. yes i have stock sticks as far as i know

 

Is your rail pressure gauge before the MP-8? I would think you have that right though. Just checking stupid stuff first.

 

maybe your not getting anough fuel pressure? maybe your cp3 cant keep up witht the demand of the tnt tune?

 

I agree with!!!

 

Where do you have your fuel pressure sending unit hooked up? What kind of pressure are you seeing at idle, cruise, WOT?

 

Go to the dealer and have them ride around the block with you with a DRB scanner.They can watch actual RP and command RP at the same time.You will have to unhook anything hooked to the RP sender.I had to do this a while back.They only charged me $30.Only took 30 minutes.


Check out post # 34.
https://www.dieseltruckresource.com/...ow+test&page=3

 

rail pressure is hooked up right and i did check to see if its right by using a friends quad rail gauge both read the same. fuel pressure is set about 26 and will drop to 24 at the lowest. homewrecker sounds good ill have to bite the bullett on the dealer charge and see what i find out

 

oh ya that fuel pressure reading is six inches from cp3 so to me i would think i have enough...do i need more?

 

Thats plenty and thats the best spot to read it from.