 Figure 1: Relay Board Electrical Diagram (large download) |
Question: I just finished installing my
six-cylinder engine in my 914-6 conversion, and the fuel pump won't run. What is the
problem? Answer: 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. If the fuel pump still doesn't operate, then check the fuse (located towards the rear of the relay board), and also check the relay. You can check the operation of the relay by removing the plastic cover and pressing down on the top 'flapper piece.' If the fuel pump begins to operate, then there is a problem with either the signal to the relay, or the relay itself. If you have a good working relay, you can also use it to check the fuel pump relay. Remember that the ignition switch must be turned on for the fuel pump to operate. Also remember that the fuel pump and blower motor share the same fuse, so an electrical problem with the blower motor will affect the fuel pump as well. |
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