Someone told me that it uses vaccuum to lower the fuel pressure in the rail when there's vaccuum in the manifold. So you still get a good injector duty cycle, without spraying too much fuel in at low rpms/throttle position.
However for my engine going into the Carina, I need to adapt the standard throttle body to a non standard intake manifold. So I've had a fairly good look at the throttle body arrangement.
It turns out, that the 'vaccum' hose that leads to the fuel rail, is before the throttle plate.
eg. No vaccuum.
Since it isnt using vaccum for anything, what is it for?
Since my throttle body is now at the opposite end of the engine, it's a bit clumsy running this line to the throttle body. I was thinking that if it is merely for vaccuum, I could tap a line into the plenum for it. However this doesnt appear to be the case?
Can someone please enlighten me!
Did I see things wrong, and it actually draws vaccuum?
Also, a slightly OT question.
What is the charcoal cannister for? I know that it's got a vaccuum line going to the intake manifold, but what does it do?
It's got two other lines coming to/from it.
I've heard that it sucks fumes out of the gas tank for some reason. (?)
I'd assume that the fumes get filtered through the cannister, and then fed into the intake manifold for some reason...
Which would mean that the two other lines lead to and from the gas tank, is this correct?
