[Vwdiesel] Fueling screw on VE pumps. --( Rabbits )
LBaird119 at aol.com
LBaird119 at aol.com
Tue Jul 20 22:24:59 EDT 2004
> WHAT? does it do ? : It operates about the same as when you adjust the
> float
> level on a gasser.
Not even close sorry!
It's nothing like setting the float level. It most like adding a little
more
travel to the throttle. Back out that screw, put slack in the cable or
push the floor mat under the pedal and you'll get the same results
except your idle will remain the same with the latter two.
Setting the float level down can lead to starvation, where the engine
doesn't get enough fuel to run - doesn't happen when backing out
the screw unless idle drops too far. Setting float higher can cause
flooding or slightly richer mixture due to more "head" above the jet
but that's pretty minimal. The flooding would equate to a bad injector.
"At idle, the air-to-fuel ratio may be greater than 100:1; even at top
speed, the mixture never approaches the comparatively rich stoichiometric
air-to-fuel ratio of approximately 14.5:1 that is common to spark-ignition
engines." (Bentley Manual: Fuel system - Diesel section.)
Basically, as load increases, A:F ratio decreases in order to maintain
speed. Simply decrease the A:F ratio and you lower the speed of
the engine, if you're at limit. Below limit, the car will be going at a
speed commensurate with the amount of fuel being injected.
It looks more like if you want to lean out your engine, slow down.
As long as you're not at the limit of what the pump's set at, turning
the screw back will only limit your maximum acceleration. It
won't make things any more lean at cruise.
Maybe I'm all wet but that's the way I've seen it.
Loren
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