no problem..plenty of people are still pushin high numbers on returnless fuel system

 

I have had my 6.0 to 12lbs boost and no problems. I have a Intank 255lph pump and 72lb injectors. I loose fuel pressure on topend but I dont go lean. As long as I dont go lean then I am not to concerned. Being as thought you have a 4.8, your fuel system is going to take you a long way. Get a good fuel pump, you already have 44lb injectors, get a good tune.

You mentioned wierd AFR fluctuations, this does NOT mean the pump is bad. Tune is most likely off. Get your Fuel pressure guage hooked up and see what your fuel pressure is.




Fixed

 

 

Hmm, well the gauge is on the way. Maybe im just full of crap haha, its possible. What about teh details on the pump itself, do we still modify the bucket and what not, or im i stuck in the past in need of an update. thanks for the info as well as P/N

 

Thanks Dewey, you knew what I ment...





Dewey completes my sentences, isnt he wonderfull.

 

the returnless system can handle alot of HP with some upgrades, as for how much upgrades? the sky is the limit, my set up with just a break in tune is at 805ft lbs of torque 96lbs injectors @ 50% duty cycle, All with a returnless system
Mark

 

I didnt realize you were still returnless.

 

What pump are you running and what are you using to drive those injectors? Megasquirt or something similar?

 

Pumps,twin Bosch 420,
being driven by a Synergy motorsport injector Driver.

Mark

 

hi there im new here I have a question for you guys I just installed 2 walbro pumps 400 lph like 2 weeks ago and this is my 4th time removing the bed of my truck for fuel issues, they turn on but they are not strong anymore they just push a little of gas they are not pushing hard like the day I Installed them ,do I need any kind of harness or different fuel pump set up since I have a returnless system, I have 2008 sierra single cab 4.8 the reason im doing this is cuz im going boost and this thing is killing me I will appreciate any tips thanks!!