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Re: [T3] My Automatic Square update (long)


I sold autoparts 15 years ago, and even then most FI filters were
steel or aluminum cans. The only ones I recall not being steel cans
were the low(er) pressure FI filters, like for the D-Jet and L-Jet. In
fact, most fuel filters I saw were biggish cans, like the size of a
Coke can. Many had threaded fittings that they would connect to- like
the GM TBI-equipped models.


On Mon, 14 Feb 2005 13:37:17 -0800 (PST), James Montebello
<lapuwali@yahoo.com> wrote:
> 
> Many of the new fuel filters are metal bodied,
> primarily because the fuel pressures in newer FI
> setups are higher.  D-Jet's 28psi is actually pretty
> low.  K-Jet (aka CIS) used 100psi, L-Jet used
> something in the 30s (32psi comes to mind) and most
> current EFI setups use 45-50psi.
> 
> Ask any engineer versed in hydraulics and they'll want
> filters after gravity-fed pumps, not before them.
> 
> --- Constantino Tobio <ctobio@gmail.com> wrote:
> 
> > I too have always known the filter to be after the
> > pump. Just about
> > every FI car I've known has been set up this way
> > (particularly when
> > the pump was inside the tank, since obviously there
> > was no other
> > practical way.)
> >
> > Now, usually the filters I've seen that go after the
> > pump were metal
> > cannisters, presumably for pressure.
> >
> > On Mon, 14 Feb 2005 13:17:16 -0800 (PST), James
> > Montebello
> > <lapuwali@yahoo.com> wrote:
> > >
> > > > Toby's new car is FI, and the FI filters always
> > go
> > > > in front of the pump. This
> > > > is both for the reason you gave and because the
> > > > filter can't take the pump
> > > > output pressure.
> > >
> > > This is news to me, considering the 914 uses the
> > same
> > > pump, the same fuel filter, and the stock setup is
> > to
> > > have the filter after the pump.  The VW FI filter
> > is
> > > supposed to be able to take the pressure from the
> > pump.
> > >
> > >
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