Mystery Fuel Line/ Delivery Component

[ben312]

14.7:1 is ideal for the most efficient burn, yes, but not neccesarily for the best fuel economy or power.

also the O2 sensor doesn't adjust fuel for altitude, the air metering device (AFM, MAF, whatever you're using) does that automatically.

not for altitude, but to keep the air:fuel mix the same, which changes as you go up in altitude.

The computer uses the oxygen sensor input to regulate the fuel mixture, which is referred to as the fuel "feedback control loop." The computer takes its cues from the O2 sensor and responds by changing the fuel mixture. This produces a corresponding change in the O2 sensor reading. This is referred to as "closed loop" operation because the computer is using the O2 sensor's input to regulate the fuel mixture.

[nando]

not for altitude, but to keep the air:fuel mix the same, which changes as you go up in altitude.

yes, but the O2 sensor doesn't have to correct for that, since the job of the MAF or AFM is to measure the mass of air flowing through them. As you increase in altitude and ambient air mass drops, the MAF and AFM has already measured this. there is nothing to compensate for, except perhaps a small reduction in exhaust back pressure.

[ben312]

yes, but the O2 sensor doesn't have to correct for that, since the job of the MAF or AFM is to measure the mass of air flowing through them. As you increase in altitude and ambient air mass drops, the MAF and AFM has already measured this. there is nothing to compensate for, except perhaps a small reduction in exhaust back pressure.

I wasn't saying that the O2 is there only to change air fuel in the change of altitude. My point was that the O2 helps to regulate the air:fuel mix, sorry if my point was confused.

[nando]

well that was sort of besides the point anyway. you don't make the most power at 14.7:1.

[ben312]

well that was sort of besides the point anyway. you don't make the most power at 14.7:1.

you right, but like I said the easiest way to make quick power on an N/A engine is to lean it out, so why would someone make a "fuel cooler" other then to keep from getting vapor lock? Also 14.7:1 is just a "perfect" burn number, not a power number. This whole thing is besides the point, the part in question is the fuel pressure pulse damper, which if I'm correct can be deleted without any major issues.

[techterr]

Why are there koolcans?

I understand that leaning an engine down does produce more power supposedly, but it does make you wonder why we ran koolcans on our cars and consistently ran 2 to 3 10th's quicker???? maybe it was the carbs... As for the fuel line that goes across the firewall to the ac line, it is the return line, which would cool the fuel returning to the tank, not the fuel rail... it doesn't like the high pressure side of the system, it will leak if you try and use it for that... don't ask me how I know this.......