ok, so i hear alot of this talk about how #4 runs to hot and lean and goes first. I was wondering if, instead of haveing to run the car richer so it gets enough fuel, if we could jsut install a higher flow and speed or wutever fuel pump to supply the fuel needed. would that work and take care of the problems or wut? I just thought about it today and decide to throw that out there.

 

Are you talking about a bigger injector in cylinder 4?

 

no, taking the stock fuel pump out and upgrading it so that enough fuel is supplied thru out all the injectors, cuz i hear that is the reason #4 dies first cuz it runs Lean because there isnt enough fuel running to it and also it runs hotter then the other Cylinders.

 

large fuel pump doesnt mean it will spray more.. that is dependant on your injectors.. larger pump just gives you the ability to pump more fuel.... fuel really isnt the issue, its the heat.. most peeps are just throwing more gas to help cool the cylinder a little bit.. not because of lean conditions..now i think about it.. im not sure if anybody has blown from a lean condition.. stats on this?

 

well, wut i was lookin at it this way, with wut we got, its not getting enough fuel, but if i put on a higher flow fuel pump, it would push more then enough fuel up so that cylinder 4 wouldnt have less pressurized fuel in the line for it. like the way im lookin at it is right now it gets the fuel but being last in line isnt getting a whole lot to be pressured in the line to the injector so on hard pulls its gettin gas but not like the other injectors are, but if u pump more fuel to the injectors more fuel will get to the fourth because they would all be gettin more fuel faster and more then enough so that the fourth injector would be getting pressurized in the line. I dont think im explaining it very well for you guys. I understand wut im saying. but i dont think you guys are.

 

I thought that some people were saying that they think the #4 cylinder is running lean, but doesn't show up on the AFR because that is measuring all of the cylinders combined. This is why people are thinking that their tune is OK when really its rich in cylinders 1-3 and lean in 4. It seems like running a larger fuel pump might help if #4 is running lean and it is because the injector in the #4 cylinder isn't getting enough fuel.

 

hm. not sure ill have to look around i havent followed to closely on the #4 but you could be right about the leanness.. i thought it was heat driven causing the problems

 

i know what the fuel pump does. umm, ok, say i have a water hose with another house connected to the side of it. no if i have limited flow, i wont get much out of the 2nd hose. but if i increased the flow of the water to fill the hose and pump more thru it, chances are that its gonna puch more thru and seperate more into the 2nd connected hose. get it? its so hard to explain. to me it is. if u understand jsut tell me. lol if not, through an idea of wut u think im sayin and i'll let you know if u got the right idea.

 

well another thing that you can do is either make your own fuel return system with a larger fuel pump in the gas tank or you can install an inline fuel pump with a splitter to two lines and then make an adapter to the other side of the fuel rail to make it so its getting even pressure throughout the whole rail...just put a fuel pressure regulator in the system somewhere before the rail and your all set

 

well it is, but i seen this as a way to keep it from running lean, the heat situation is still boggling me. maybe routing the coolant to flow the opposite way, but then #1 would run hotter. but it would be getting more then enough fuel, but maybe less problems cus it doesnt have the lean issue?

 

i forget what brand the fuel pump was and how many l/pm or g/pm it was, but i got the idea off of collens family motorsports in North Hunnington PA...the car club im part of is sponsored by them so we get free admission to the 1/4 track and discounts on parts and labor

 

how bout that, splitting the line in 2 with a higher fuel pump and tapping it into the fuel rail on the other side so that fuel flows on both sides

 

ok? lol. i was thinking of a walbro fuel pump. size i dk yet, but this guy i kno at the cruise runs a 255 walbro for is older turbo grand am motor swap into a feiro. hes got a turbo on it off of a deisiel, its big enough to push 600 hp, but he said is motor wouldnt stand that much boost hes only running 8 lbs. but it sounds freakin awesome and i hear its fast as heck, he wont even pull it off the trailor unless at least $1000 is on the table.

 

theres going to be another vendor coming to the site soon...a bunch of the guys here in PA are going to form a site and actually fab these kits and sell them so i'd look for them here sometime in the future...just don't know when expected debut is

 

I also, think thats a good idea. Some one needs to do this, because i dont have the money to do it right now. I would have to buy a new fuel rail and make sure it'd work before putting it on the car, its my DD.

 

hmm i can show the motor to my uncle and ask him what he thinks we should do, and imm a ask the mechanic at the shop too see what he has to say

 

k tahts kool, jsut let us know wut u find out. cuz this would be good mod to save our motor if it helps.But im pretty sure it would work.

 

i think it could work, but i will look at the fuel rail tonight too

 

already a huge discussion on this and its feasibility on RLF.... at least two of the members there have blown engines because of this.

 

blown? what happened?

 

i think more than 2 members, i can name 2 off the bat, Tityrous (Keith), and Blown-4-Banger (Cameron), i think theres more than 2

 

Oh, your talkin about #4 running lean, lol. yea. thats why i thought about this. and these guys come up with some good ideas like the fuel rail thing.

ok, so i jsut seen this, and im reading thru it. i jsut thought i would throw it in hear. But Cobalt SS super, you should tell them about ur idea, because there thinking of putting a line in the middle of the rail, which i dont think is a good idea. along with some others on there. Check it out. http://www.******************/forums...ight=fuel+rail

red line fourms = ************* b.s lol

 

but wait i looked at my fuel rail just now, the line if i tap it may be too short, and send more fuel to the 4th cylinder then the others, now i have to think, i saw the end of the fuel rail had a nice are to tap into and put another line, but im not sure how this could work, could i use the factory fuel pump for it?

 

i dont know, i havent been out too look yet. Im gonna be puttin on a 255 walbro fuel pump once i get my 60 #ers and 2.7 and if no body fixed this i'll buy one get crazy with it. cuz i need my daily driver ya know. cuz when i get out of basic training im puttin a turbo on my car, so, i need to get the problem with the #4 fixed. i think it would work. like, have the retun line come from the middle of the rail, while the lines are pumping fuel in on each side. ****, pop another hole in the tank and jsut put another stock fuel pump with a line running to the side that you tapped.and the return line for the fuel? idk.

 

hmm a reutrn fuel line, where can we tap that into tho? if we run 2 lines from either side of the fuel rail