I did a search and didnt find the answers to a couple of questions I have,

Im converting my fuel system to a return style,

now what is the stock fuel pressure at the rail?
do I need a high pressure in-line fuel pump or not?

thanks alot =)

shane

 

Good job!

No you don't need an inline pump, but while you're at it you might want to upgrade to a 225HP walbro. Not sure what stock base pressure is.

 

new fuel rail. or modded stocker
drop the tank. drill, weld in new return bung. usually smaller then the feed.
255 pump.
fuel pressure regulator
beer
fuel line for return

 

yeah you do need an in-line pump becuase at high RPMs with #60 injectors and smaller pulleys the #4 piston leans out becuase (ive only heard this) fuel enters the #1 piston side so with the lack of fuel pressure #4 piston is starved for fuel, and an inline fuel pump would sovle this problem being that our current fuel pump is having a hard time keeping up.

if what I have read on this furm true,


I also plan and am building a turbo kit that I will be proboly putting in this winter or soo.

I know what I need to do and how to do it,

I just need my first 2 questions answered,

whats the fuel pressure at the rail?
do I need a high flow in-line fuel pump or not?

 

https://www.cobaltss.net/forums/show...=fuel+pressure

bigger intake pump.
inline not needed.

 

just get a fuel rail/fpr off of a Jbody with a 2.2 ecotec. I'm taking a wild guess and saying that fuel pressure is going to be near the same, if not get an adjustable one (accel ls1 AFPR fit on the eco rail) get the lines and your set. no need for inline pump

 

alphajaguar on RLF has documented this up and down and is already researching a solution.

 

i thought halfcent and NJHK have come to the conclusion that it wasnt fuel starvation that was causing #4 pistons to blow.

 

That's correct, Fuel pressure will be equal throughout the pressurized rail, regaldless of RPM, flow, etc...

 

Pressure at rail is around 50psi to 60psi at key on and is to be maintained around that pressure under running conditions. No inline pump, you need to use a different in tank pump.

 

Hahn thinks its the distribution of air through the LSJs intake manifold thats causing 4th cylinder to go lean and blow.

 

hmmm
how is a manifold that is identical on all runners, being fed from a central point, going to lean out on cylinder?

 

I am pretty sure that the fuel rail fuel pressure is at 58.

 

I suppose the shape of the manifold itself could cause it to favor a certain port.

 

this is what hahn said in their turbo 2.0 update thread..

 

The spec is 50-60 psi and it varies slightly from car to car.

 

the link i posted is a link to a thread on here about the fuel pressure. it was tested on a IRL.

 

Last time I tested mine it was 55psi on the button at the service port.

 

So these stay at a static fuel pressure throughout the boost range and just increase pulsewidth as boost in increased? I was actually thinking of this today while at work and working on a 2.2 ecotec saturn w/return style. Does anyone make a boost referenced fpr that fits the ecotec rail?

 

If that was the case then it makes the return system a million times easier. Just put a constant voltage pump in there, set it, and forget it.

You also don't need to drop the tank and weld in a fitting. A fitting JB welded into the filler neck is more than sufficient and actually the correct way to do it.

 

anything involving jb weld is not the correct way.

 

Do the n/a cars use a return style? If they did then you would just have to swap tanks which is pretty simple. BTW, I have in the past made a return line with drilling/tapping a line into a filler neck. Jegs actually sells an insert with a nipple on it that you can use for that reason. I'm going try to pick up a rail from the junkyard this weekend to hopefully get this going on my car in the near future.

 

I hope to have this done shortly. I already have the return rail and regulator, just shopping around for pump options.

I'll keep everyone posted when its completed.

 

thats one way of doing it. but using jb weld, while it will work. is not a good way of going about it.


well, the pump choice is a wide open range there Mr Witt.

 

Yea because there isn't 239084293048239048234902384902348 SRT guys using JB Weld for return lines and 94092q85v9q -859dm2q903d2 other people haven't used it for oil return lines. What's your amazing suggestion for putting a fitting in there?