

| Subject: | Fuel pump circuit information to file away |
| From: | Jonathan Poole |
| Date: | Tue, 7 Jun 2011 22:04:39 -0400 |
Some of you may recall that the air cooled engine in my 83 westy was experiencing a cutout at around 3k rpm while driving. When I last emailed the list about this problem I suspected the electronic ignition that I had recently installed. In the subsequent months I've only driven my van a few times so opportunities to test my changes and to troubleshoot have been limited. I recently discovered the problem though and it turned out to be lack of power at the fuel pump. This was caused by my neglecting to reconnect the fuel pump circuit lead to the starter when I had changed something on the starter wiring. I must have not seen that it was disconnected when I put things back together in there. So here is the oddity, the fuel pump was getting enough power to run the engine in spite of it's primary lead being disconnected from the starter. I haven't traced the circuit out in the wiring diagram or on the van so I'm not sure where the power was coming from but apparently it was enough voltage/amperage to run the pump so that I had the volume of fuel needed to run the engine at around 3k rpm but not above. It's an odd problem that had me scratching my head. Once I was able to determine that it was a fuel supply issue it became easier to track the problem down but I wasted a lot of time looking elsewhere which is too often the case with mechanical troubleshooting. I now have a starting battery drain to track down and blinkers that are always powered which I don't think should be. I wonder if these problems were somehow caused by the overloading of a circuit by unintentionally powering my fuel pump with it?? I hope to find out soon. Jonathan Poole '83 AC Westy
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