I am getting ready to add MSII to a GM 3.5 out of a 2004 Malibu I noticecd that it only has one fuel line. From what I can see the return line feeds back to the pressure side. Can anyone tell me about this system, how is the pressure regulated, what is the factory pressure, or do I use a special pump for this application? Any insight would be greatly appreciated.
Thanks
Blatzy
No fuel return line ?
Re: No fuel return line ?
I'm specualting here, but others will chime in with better/more info.
Newest trend is to have returnless fuel systems to save on material cost. The fuel pump is then given a PWM signal from the ECM, and pump output controls amount of fuel flow instead of having full flow and returning what is not used (which is most of the time!).
A returnless system probably reduces vapor pressure in the tank and would be easier for retrofitting into a non-EFI car (if that's what you are doing). Are you putting MS on the Malibu or are you putting the engine in something else and ditching the OEM controls?
Newest trend is to have returnless fuel systems to save on material cost. The fuel pump is then given a PWM signal from the ECM, and pump output controls amount of fuel flow instead of having full flow and returning what is not used (which is most of the time!).
A returnless system probably reduces vapor pressure in the tank and would be easier for retrofitting into a non-EFI car (if that's what you are doing). Are you putting MS on the Malibu or are you putting the engine in something else and ditching the OEM controls?
Needs to get the toes out of the water and just jump off the diving board!!!
current EFI project:
65 Chrysler 300L, 413, working on inline dual GM TBI units, will run with MS2. Hoping to have factory-style appearance.
current EFI project:
65 Chrysler 300L, 413, working on inline dual GM TBI units, will run with MS2. Hoping to have factory-style appearance.