if the fuel pump ran fine with the x relay 17 or 18 swapped into slot 2, you have ruled out all the internal connections for live, ignition live, earth and output to fuse 5. that leaves you with either a dead fuel relay, or an issue with the rev counter signal back to the fusebox. since the rev counter appears to work then just leaves you with faulty relay. but dont worry about the relay for now, concentrate on getting the car running just leave the x relay in that slot for now. the output from fuse 5 goes to E/14 which is fed by fuse 5, powers the fuel pump and also a male spade which then powers thye AAV and WUR in the engine bay. Also feeds big spade N before the fuse, but this is unused on the kjet 8v so no need to worry about that. N is used for some versions of digifant injection, on carb engines it feeds the inlet manifold heater and on diesel engines its for glow plugs unless you mean the extra connections for the relay socket, unless they are shown connected to the relay they are unused. pins 6, 7 and 8 on the socket are for other engines and not relevant to the kjet injection.