[T3] Fuel Pump Relay - 69 Fastback

Tim Schiller schillertim at comcast.net
Sun Jul 11 21:48:56 PDT 2021

I did a little testing when I got home and prior to reading these most recent posts. He is what I found or know.

My 85 & 86 wires no longer have the white plastic cover on the pump relay. Is it possible to replace?

I did not cut any wires but did ground the 85 pin. When I turn key on, pump runs. Turn key off pump stops. So I think this tells me pump is good and it is not my ignition.

This appears to indicate there is an issue with the wire labeled in Bentley as T1 , 19 which I believe means it goes to the ECU #19 terminal. Not sure what is meant by T1, if anything 

Sent from my iPhone

> On Jul 11, 2021, at 9:19 PM, Jim Adney <jadney at vwtype3.org> wrote:
> On 11 Jul 2021 at 17:17, William Jahn wrote:
>> If you just ground it connected you will kill the ECU.
> No it won't. It won't care. It's an open collector on an NPN transistor to 
> ground. You can ground it or not. If you connect a full 12 V to it, without any 
> limiting resistance, that WILL kill it.
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
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