So 2 things here:
1. the fuel pump relay and abs relay I think are in the same 15pin box. Its attached to the engine bay fusebox - looks like this
https://www.ebay.co.uk/itm/255888372691 ... Sw~P1jog47 - not saying this is the right part for you though. It is entirely possible that one part of the relay is working but the other isnt - I had that on a 308 2010 1.6hdi.
2. 2.0 Hdi engine Cambelt - rocker arms fix. I fixed a 307 2.0 hdi 90 that had that happen - from what others have mentioned, the design is stil one that sacrifices rockers instead of valves/pistons (aka a very good design) - You will need the timing pins (about a fiver off ebay) as if its a normal cam belt change but in your case you will likely need to take the rocker cover off, then the overhead camshaft needs to come out to replace the rocker/s that may be broken. The rockers have small pin bearings in them and you want to get as many out as possible (aka magnet fishing)
Just make sure you get all the timing pins in and then you only need to worry about putting the camshaft back in the right position. On my 307, AA said it was a write off, but i took it home anyway, fixed it and its my Sons every day runner 6/7 years later, solid as a rock.
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