[Vwdiesel] max fuel adjustment

Will Taygan william at taygan.com
Tue Mar 30 18:22:08 EST 2004


Is this right?

Top of pump (screws connected to accelerator) controls the amount of
fuel injected, thereby controlling idle and max rpm.

Side of pump controls max fuel given at a particular degree (of the top of pump accelerator control), in
essence giving more fuel for the idle, more fuel for the mid range and more fuel for max at a given rpm,
(raising the scale).

I'm going pick up a copy of the bosch ve yellow book to see if I can internalize this.

Will Taygan
Concrete, WA

> -------- Original Message --------
> Subject: Re: [Vwdiesel] max fuel adjustment
> From: LBaird119 at aol.com
> Date: Tue, March 30, 2004 2:31 pm
> To: vwdiesel at vwfans.com
> Of course the max rpm screw (which could be interpreted as a max fuel

> screw, on top of the pump, only limits the maximum fuel.  The
> fuel/injection 
> one raises it over the whole range BUT it's more like just raising
> scale. 
> The bottom is still there but you have to readjust the idle screw to
> get 
> back to it.  It will only smoke at higher rpm (mostly higher throttle

> positions) because it's now capable if injecting more fuel than 
> before (if you turn it up).  At lower rpm and throttle settings, the

> engine is able to speed up thusly using the extra fuel rather than 
> spewing it out as smoke. 
>   Make sense?  (Sometimes I don't).  ;-)
>      Loren
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