[Vwdiesel] adjusting max fuel screw?

Gerry Wolfe gjwolfe at telus.net
Fri Apr 22 22:46:52 EDT 2005

There is a photo of this at my website ('91 TD - 68hp MF engine).

Loosen the 13mm bolt, adjust the screw -- CW = more fuel, CCW = less fuel -- 
and tighten.  I've found this is a pretty tight one to get at, and when you
loosen the bolt/housing the screw also moves.I do mine with the engine off..
Make changes VERY gradually... the width of a screwdriver blade will have an

rgds, g.

website is at www3.telus.net/public/gwolfe and click on the "VW photos"
[best to copy/paste the URL... most mess up on the www3.

----- Original Message ----- 
From: "Area31 Research Facility" <stephensrw at stn.net>
To: <vwdiesel at vwfans.com>
Sent: Friday, April 22, 2005 18:54
Subject: [Vwdiesel] adjusting max fuel screw?

> All,
> I have had to add considerable back pressure as a negative side effect of
> making my genset quiet out of respect for sleeping neighbors.  As a result
> the engine appears to be running too rich. Fuel consumption is way up and
> power is down.  Engine makes more waste heat, all bad consequences. :(  I
> was wondering if I could lean it out a bit by adjusting the max fuel screw
> on the Bosch FI pump.  Am I correct in assuming this is the one at the
> of the pump just above the fuel solenoid wire connection?  How does one
> adjust it?  There are three adjustments, a nut, a sleeve with a wrench
> purchase and a square head bolt at the end.  I'm thinking the nut closest
> the pump may be just a mounting nut and does not get lossened in the
> adjustment.  I am running at 1800 RPM under throttle control by an
> mechanical governor.  Any ideas welcomed.
> Thanx,
> Rob
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