Bought it in 2021. No extended warranty

Nothing according to volvo service history.

Im not an expert, but if indeed it was petrol used (without ignition) - changing just faulty pump - would that sort possible problems in future (its working now with no problems now)

Edited by Dumitru Butu on 24/09/2023 at 12:09

So, they've replaced one injector, hopefully they've had the others cleaned and tested.

As above i'd be suspecting a previous misfuel to have caused premature wear of the pump, almost certainly not in the service history because the owner having negligently misfueled will (if they had any sense) have made sure no record of the event is recorded anywhere, it could well have happened whilst still under warranty.

The danger of minute particles going down the fuel lines is of jamming an injector in the open position (hence 1 new injector?), but one would hope the whole system was cleaned including the rest of the injectors.

If it runs well without smoking or other symptoms hopefully it will be ok for the forseeable future, no fault codes showing?

Edited by gordonbennet on 25/09/2023 at 12:03

I had a high pressure pump 'lunch itself' on a diseasel Focus. I'd bought it second hand, so had no idea if it had ever been mis-fuelled. However, I'd just paid to have the timing belt replaced (what is a clavis gauge?) and the garage that did it admitted using an impact driver to slacken the camshaft bolts. I've always wondered if the shock load could have caused the pump to fail.

Messing about with camshaft and crankshaft, (now sadly deceased) recently I came across the suggestion that impact drivers were bad for them, academic for me since I dont have one, and academic for almost everyone else since there is very little chance that pro mechanics will be persuaded not to use impact drivers, since this would cost them a huge amount of time.

IF the fuel pump is coaxial with the camshaft I would have thought damage was quite likely. If by "bolts" plural you mean the hold-down bolts (or whatever they are called this week) rather than the cam sprocket bolt maybe less likely.

Clavis make belt tension meters. I think they work on resonant frequency, "guitar string" stylee.

I THINK I've heard of a smartphone app for it too allegedly working in the same way but cant remember details

Edited by edlithgow on 26/09/2023 at 01:19