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Registered
Join Date: Aug 2003
Location: Bowling Green, KY
Posts: 36
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fuel pump wiring for carb conversion
In the 914-6 tech section of PP- there is a section that describes what to do to hotwire the relay board to operate the new fuel pump when the ignition is turned:
"The 914-4 relay board has the fuel pump wired to be controlled by the fuel injection computer. Removing the fuel injection system and the FI brain, disables the fuel pump. In order to get the fuel to work again, you need to jumper some wires on the relay board. An electrical diagram of the relay board is shown in Figure 1. In this configuration, the fuel pump is powered by jumpering from another 'hot section' on the relay board. In order to wire the fuel pump to turn on when the ignition is on, wire pin 85 from the rear window defogger relay to pin 85 of the fuel pump. This is the ground lead. Then wire pin 30 of the rear window defogger to pin 86 of the fuel pump relay. I used bullet connectors and a short piece of wire to plug into the sockets on the relay board. This should work well."
I tried this today using two small jumper wires. As soon as I connected the battery, the pump started. I disconnected the battery and doublechecked that I had the right relays connected correctly. Again, when I connected the battery, the pump started running. For grins, I then went over and inserted/turned the key: the jumper wires fried and smoke filled the garage. Note to myself: I am a dumbass. Anyways, after removing the jumpers- I checked everything again ...and everything is still working correctly (got lucky).
I am assuming from the directions, that the relays need to stay in their respective places. True? Or am I supposed to jumper as instructed and remove these two relays from the board?
Ideas?
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