returnless fuel system options
05-07-2008, 08:07 PM
#12
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
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
Last edited by 03sierraslt; 05-08-2008 at 04:39 AM. Reason: I be retarded
05-07-2008, 08:22 PM
#13
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 doesn't mean the pump is bad. Tune is most likely off. Get your Fuel pressure guage hooked up and see what your fuel pressure is.
You mentioned wierd AFR fluctuations, this doesn't mean the pump is bad. Tune is most likely off. Get your Fuel pressure guage hooked up and see what your fuel pressure is.
05-07-2008, 11:01 PM
#14
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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
05-08-2008, 02:22 PM
#16
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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
Mark
05-06-2015, 07:23 PM
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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!!
