Fuel pressure

[SJ]

----- Original Message ----- 
From: "Sam Letzring" <sletz at msn.com>
To: "SJ" <syljay at optonline.net>
Sent: Monday, December 20, 2004 9:11 AM
Subject: Re: Fuel pressure


> Thanks for the reply- HOWEVER- this is the pressure directly out of the
> pump- before the regulator (procedure Bently manual 20.16)

Think of a hose with spray nozzle connected to a tap.
Put a pressure gauge at the tap.
Pressure will read 50 psi , or whatever your water supply pressure is when
the spray nozzle is closed.
If you fully open the spray nozzle at the end of the hose, the pressure at
the tap will drop to almost zero.
As you play with the nozzle, the pressure will vary from 50 to almost zero.
The spray nozzle at the end of the hose is the pressure regulator.

It works the same way in the audi.
If you  have a blockage at the end of the line(spray nozzle closed), the
pressure at the pump will read max . . no fuel flow thru the system.

SJ
>
> Sam
> ----- Original Message -----
> From: "SJ" <syljay at optonline.net>
> To: <quattro at audifans.com>
> Cc: <sletz at msn.com>
> Sent: Monday, December 20, 2004 6:09 AM
> Subject: Re: Fuel pressure
>
>
> >
> > > From: "Sam Letzring" <sletz at msn.com>
> > > Subject: Fuel pressure
> > > To: <quattro at audifans.com>
> > >
> > >
> > > Started through the checklist in the Bentlry manual- and the first
check
> > of
> > > fuel pressure showed > 150 psi instead of the 60-70 psi expected. This
> was
> > > the pressure directly out of the fuel pump - before the regulator.
> >
> > ***** System pressure should be around 90 PSI.
> > Its not the fuel pump that regulates the pressure, its the pressure
> > regulator at the end of the line that does it.
> > I think its clogged, or you have some other clog in the fuel system.
Thats
> > why the pressure is so high.
> >
> > Fuel pump ---> fuel filter---> fuel distributor ----> pressure
> > regulator -----> back to tank
> >
> >
> > SJ
> > 85 Dodge PU, D-250, 318, auto
> > 85 Audi 4k - - sold but still on the road
> > 88 Audi 5kq
> > 90 Audi 100q
> >
>