[T3] Fuel Pump Circuit

bobsnotch at aol.com bobsnotch at aol.com
Sun Apr 21 10:56:37 PDT 2019

Jim, isn't there 2 wires that come into the engine bay in the left front corner that travel back to the under seat relay? I think 1 of them powers the ECU, while 1 is a ground. On the t-4, both are hot, which is why I remember them.
Dennis, there should be a white wire (FI wire sized) that connects to the white wire sticking out of the harness where you've got your green wire plugged in. If you ground it (body side) with a jumper wire, and turn on the key, the pump should run. It's the ECU's pump ground wire, or #19 wire. The car harness side goes all the way to the front FI pump relay. You could pull the ECU out, and with an ohm meter check your wiring from terminal #19 to the other wires in the general area to find the other end of #19 in the FI harness. 
I hope this helps.

-----Original Message-----
From: Jim Adney <jadney at vwtype3.org>
To: type3 <type3 at vwtype3.org>
Sent: Sat, Apr 20, 2019 2:22 pm
Subject: Re: [T3] Fuel Pump Circuit

On 20 Apr 2019 at 17:58, Dennis Stiefel wrote:

> > Where does that green wire go? It looks much longer than what I expect to 
> > see. Normally each of those wires would only be about 3" long.

> The end of this wire keeps breaking off that´s why the green wire was added. It´s goes to two black wires that come out of the left rear corner of the engine compartment. Those black wires go into a plastic connection where I connected the other end of that green wire to. According to my DVOM when I turn the ignition switch to the on position it has 12v ground. But it staysgrounded until I switch it off. I avenTMt tried the start position on the switch to see what ITMm getting on this wire. 

That sounds like the wrong wire; it's probably the wire to the 2 rear taillights.

#19 connects to a single wire that exits a harness right near the AT dipstick.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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