Conclusion to the Fuel Pump Repair
I've learned a few things doing this job.
Firstly no need to prise the top off the black cylinder. It contains a filter and along with the outer unit acts as a swirl tank integrating the pump, pre filter strainer and post filter. The pump motor taps out. Having removed the attaching pipe, spray WD40 around it, put it on a bench with a suitable tap fitted up the bottom to the motor entry point and tap the top of the cylinder lightly with a mallet. The motor pops out.
I bought a replacement motor cheaply on Ebay, it is Italian. I had to buy some replacement fuel pipe and jubilee clips to fit it back together. I spent some time cleaning the inside and outside of the external housing with meths, rag and a small screw driver to remove bits.
Because I removed the top of the black cylinder, doing this damaged the outer plastic slightly and broke the upper internal plastic seal. I superglued this back together and clamped it. I have used long cable ties to secure it.
The filter looked OK. Unless you have done a significant mileage I wouldn't change or open the cylinder.
The pre-filter strainer on mine was shot so I removed and repaired it. I tore out the remaining screen and fitted two circles of curtain mesh and a circle cut of a fine tea strainer. I did a week's test in a jam jar on the curtain mesh, it wasn't affected. So hopefully I have master bodged the whole unit for a fraction of the price of buying a new one.
It now works in the tank, refitting it is tricky, next job is pour petrol in and try and start it for the first time in 8 years!