[T3] Fuel Pump Relay - 69 Fastback

William Jahn willjahn975 at gmail.com
Mon Jul 12 11:33:04 PDT 2021

It's difficult trying to diagnose an electrical issue when I can't see the
car. I've been able to fix everything on my own 73 including repair the
electric air bypass valve that was sticking . Over time original pump and
power relays will no longer exist.

On Mon, Jul 12, 2021 at 11:15 AM William Jahn <willjahn975 at gmail.com> wrote:

> I was simply going by what the Bentley states. That's all I have for
> reference. In testing the fuel pump Bentely states not to ground that wire
> connected to the ECU it doesn't say all years or specify a year. I never
> had any issues with the pump not running except once when it was the
> connector on the fuel pump. I have no more advice to offer. The only thing
> it seems I was possibly right about was connector T1 and it's an
> intermittent electrical issue and only because it did work a few times.
> Bypassing the relay 87 to 30 will only tell you if the pump and it's wiring
> are working if the engine runs, it won't tell you anything as to why the
> pump relay coil has no ground. The Bentley is fine for some things, not for
> everything.
>  At least I tried and in doing so made me look like an idiot offering all
> the wrong advice.
> On Sun, 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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