[Laird Scooby]

Not sure if the Volvos have the same sort of fuel pressure damper as the XJ40s, not as much need for it as the Jag pump is a bit "over-specced" for the engines, particularly the 3.6/4.0 models and smaller.

As far as i'm aware, the later XJ40s used the V12 spec fuel pump, when the XJ40 was originally designed, the AJ6 engine was still in its infacny and the jag engineers didn't want the Rover V8 stuffed under the bonnet so they deliberately designed the chassis NOT to take a Vee engine - that's why the Jag V12 saloon and Daimler Double-Six survived in the old Series III bodyshell until 1992 when Jag engineers had a chance to re-engineer the chassis for it.

That's why the later cars used the V12 pump and need the pressure damper.

I might have a couple of inaccuracies in there, it's a long time since i was told that by an ex-Jag Master tech who went on to run his own Jaguar Specialist business and who knows - he may have "edited" the story for me so as to make it easier to follow.

Granted the flow/pressure may be slightly higher from your pump as it's probably the turbo model pump but wouldn't have thought it would be that different on a 3.0 to a 2.3 turbo in terms of fuel requirements.
For example on my other beasts, the Rover 827, that uses a similar spec pump to the 2.0 turbo Vitesse models whereas the 2.0 n/asp and even the 2.5 KV6 make do with lower pressure and flow pumps.