Yesterday was a milestone and was a very eventful day.
I fitted the main fuel tank breather and then filled the tank with about 15 liters which didn't end up on the garage floor, so that was a good sign.
When I switched on the ignition, fuel pist out of the fuel pump, but fortunately it was just a connection that needed more tightening.
The engine was cranked over, but only came to life with the help of some 'Start-You-Busterd' sprayed down the inlet manifold.
But then the oil pressure guage wouldn't budge. We went through the process of elimination to find the problem and found that the oil was pumping through the engine, but connector on the cylinder head to the oil pressure guage was blocked. It was a faff to get the connector out again in a very inaccessible place, but we got it out and cleaned out the blockage. Once back in, the oil pressure guage worked immediately.
But the engine was rough, and it turned out that cylinders four and eight weren't firing. It has spark and it's getting fuel to the injector connectors, but not firing, so the injectors are probably blocked.
I'll get the out tomorrow and get them checked.
A very satisfying day nevertheless.