In tank injection pumps,interesting (?) facts.

[quk@sievers.com (Phil Payne)]

In message <VA.0000031a.0a43579b@maximum-bhp.u-net.com> Chris Wilson writes:

> What would a Bosch mechanical metering unit make of a drop of upper 
> cylinder lubricant in the fuel?Would this prolong the (expensive) pump 
> life without messing up the metering capabilities of the unit.(Bear in 
> mind the "slots" in the head are microns wide and laser cut).

I can't see that it would mind - the ones I've taken apart have shown no signs 
of residue build-up.  After all, it's sealed and there's no evaporation.  It's 
a different matter in the air mass sensor chamber, where there _do_ seem to be 
signs of residues from fuel evaporation - leakage from the bottom of the 
plunger?

> BTW I have now got a source of correctly rebuilt and flow tested metering 
> units,and warm up regulators.Due to the (typical) pitiful performance of 
> Bosch in supplying genuine factory replacement metering units,I 
> investigated alternative sources,and we can now supply metering units at 
> around half the price of a Bosch unit,with reliable turn round times.

How much for a 0 438 100 153 (w/o system pressure control valve)?

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club