Noisy Main Fuel Pump?

[Steve 940]

Hi,

Hope this is not in the wrong section, but have some questions about this issue even after reading the very detailed FAQ section on this subject.

Problem is a very noisy whirring main fuel pump under passenger seat, grovelled around and carrier didn't seem loose, just before I bought the car the pump and filter were replaced. Hose to fuel rail/engine had a rhythmic pulsing.

After digging around on forum pointers to perhaps a faulty in tank pump or fuel pressure regulator.

Don't have access currently to fuel pressure gauges, and not something I've done before so a bit wary to go down that route.

Tried listening at tank outlet, with key turned to kp2 but can hear only a very small, gurgle, like fuel trickling into tank for a second, but no motor sound.

Need to identify if it's working or not, FAQ seems to suggest going via relays/fuses and jumper wire, but was warnings about frying ECU if I grounded it in error, so I' m not too confident going down that route.

Separated harness under lead side locker, and have got 12.5v at pink wire that should be + to the pump.

Is it feasible to get spare 12v battery, and put positive to the pink wire to pump, and negative to the ground wire to the pump to see if the pump runs??

Concerns, if it runs, will it damage pump trying to push fuel when the rest of the system is off?

Tried Parts For Volvo today and seems they don't have my type of pump and seems tank gasket should be renewed and also not held, so rather trying to avoid opening it up if I can.

Appreciate any thoughts.

Cheers
Steve