80q Fuel pump relay

[Huw Powell]

> Thanks Huw.
>  
> I think my numbers don't quite match up to yours, but I get the general  idea.

They should be the same... and on the bottom of the relay, etc.  The 
15,30,31 and 87 are standard DIN relay numbers; the "1" probably is, 
too.  Anyway...

> So, I take it there is no way to check the integrity of a FPR by connecting  
> straight to battery power?

Correct.  You would at least need some sort of signal for the coil 
terminal, either from a running engine or some sort of signal generator. 
  Rat-at-atting it with 12 volts might work.

Side note: the "fuel pump priming" feature often observed on these cars 
is just a bug - the FPR turns "on" for a moment in response to the first 
pulse from the ign sw to the coil.  Then it turns off.

> And, excuse my ignorance, but what is an SPST relay?

Single Pole Single Throw.  A simple on/off switch, in other words. 
Normally Open (NO) in this case.


-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/