Checking Fuel Pressure

[Ti Kan]

Ice Cat     ^. .^   ~ writes:
> Hi everyone !   Jim is about to test the fuel pressure on the '88
> Audi 5000 but do not have remote control device to plug into fuel
> pump relay socket.

Easy enough to make one... a length of 12 gauge wire, a switch that's
rated for more than 15 amps , two male lugs, (optionally) an inline fuse
holder and fuse, and some solder is all you need.  You can get everything
from your local Radio Shack.

> One thing we thought of was to use a separate battery to run the fuel
> pump independently of the ignition.
> My concern was this without any safeguards in the way of shut offs,
> was that too much pressure might be applied to the line with no where
> to go and damage something.   Is that possible?

No.  Excess fuel is pumped back to the tank via the return line.

> Is the dump line which returns to the fuel tank going to be working
> okay if the engine isn't running and the fuel pump is, for example ?

Yes.

> Or defeat the switch on the air plate in order to keep the fuel pump
> running while the engine is off?

You don't need to do that.  Jumpering the fuel pump relay will make the
fuel pump run whether the ignition is on or off.

-Ti
2003 A4 1.8T multitronic (soon)
2001 S4 2.7T
1984 5000S turbo
1980 4000 2.0
--
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Laboratories, Sunnyvale, CA. USA
  ///    ti at amb.org
 //////  http://www.amb.org/ti/
///