Thanks for those who responded with various suggestions for the fuel pump repair.After weighing up the options, I decided to go for M5 thread repair inserts. To overcome the possibility of inaccurate drilling, I first bolted the two halves of the pump together without the diaphragm with just four of the original bolts. I then drilled the two remaining holes through with the repair kit's tap drill which is 5.2mm. I then tapped those two holes and fitted the thread inserts. I was then able to bolt up using those two holes with new M5 bolts and repeat the process on the other four holes.
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