[T3] Fuel Pump Relay - 69 Fastback

[Tim Schiller]

Even harder when the person you are working with is a rookie

Sent from my iPhone

> On Jul 12, 2021, at 11:33 AM, William Jahn <willjahn975 at gmail.com> wrote:
> 
> 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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>> 
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