Frankly a bit of a mine field. I personally think the best way to do it (if you want to save money, and are going to keep the RR)) is to buy a genuine Bosch pump and put it into the original housing.
Problem is that many of the 'OEMs' are actually made in China and possibly of dubious quality:
https://www.aliexpress.com/store/product/F...12629.html
When my pump died a couple of weeks ago I was desperate to get it back on the road for work reasons and my mobile mechanic didn't want to start pulling apart the existing housing and swapping pumps over, so I got an 'OEM' pump from a recommended supplier, having said that, it could in all possibility be a cheap copy and I've paid a couple of hundred £s more I should have. I noticed some online LR parts suppliers are listing 3 qualities, genuine, OEM and cheap...
The job still isn't finished on mine, see my thread 'serious fuel leak'. I did make sure I got genuine LR gaskets and sealing rings for the pump and inspection accesses, but I've got a nasty leak. Also, it seems as though since the job was done my fuel gauge is playing up.
Are you sure you have a failing pump? might be worth while checking fuel pressure using the schrader valve on the fuel rail.
Good luck with the job, hope all goes well.
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