[T3] (Fwd) 1969 Fastback Fuel pump

[Tim Schiller]

Connected 30 and 87 . Pump runs but did not start. I’ll try again after charging battery. 

There was an article or chapter from Clymer that some posted that suggested checking main relay can try that.

Sent from my iPhone

> On Jun 7, 2020, at 1:58 PM, Jim Adney <jadney at vwtype3.org> wrote:
> 
> On 7 Jun 2020 at 12:22, Tim Schiller wrote:
> 
>> There is a click when turning the key to on, but is something other
>> than fuel pump relay. If I place hand on relay there is nothing when
>> the key is turned on. 
> 
> It sounds like the fuel pump relay is not getting actuated. The single click 
> you hear when you turn the key ON is the FI main power relay under the 
> back seat. That energizes the FI brain and the brain should then turn the 
> pump relay on.
> 
> Unless the engine is turning over, the brain will energize fuel pump relay for 
> only about 1 second, so you need to take measurements quickly.
> 
>> Red wire to #30 is hot with 12V
>> Blue & white wire to #86 hot with 12V with key on
>> Grey or white wire is connected to #85
>> Red wire to #87 registers 0 V when key turned on
> 
> I'm not sure of the colors of the wires to 85 and 86. When plugged onto the 
> relay, one of them should be hot all the time and the other should be hot 
> except when the relay is energized. The brain grounds one of those wires to 
> energize the pump relay.If you don't see either of these going to zero during 
> that first second, then your problem is related to the things that should be 
> grrounding that wire. That means the wiring from the brain to the pump relay 
> and the brain itself.
> 
> Start by getting a small jumper that you can connect between 30 and 87 on 
> the relay. This should make the pump run. If it does, see if the motor will run. 
> If the motor starts and runs, it means that the FI system is good, with the 
> possible exception of the one transistor that grounds the pump relay wire, 
> but it could also be the wiring between the brain and the relay.
> 
> Try this and get back to us.
> 
>> The above is with old relay and new relay
> 
> Sounds like the relay is NOT your problem.
> 
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
> 
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