main pump: 135l/h (380kPa and 13V, 8A)
2nd pump in left half tank: 100l/h
(other S60's have 125l/h)
That's what I thought when I said this:
255LPH on all Volvos
I think the car only pulls about 235LPH peak with 12 volts. Plenty for most people here.
All pumps in Volvo's are a 255LPH pump to my understanding. The miss understanding from the LPH post of 135/100lph is that the pumps are regulated by the FPM in the trunk, near the spare tire. The pumps deliver LPH by how much amps they receive. At max input, the pump will deliver 255LPH. At 8A, the pump will only deliver 135LPH... and at 4A, the pump will deliver 100LPH. Combined total is 235LPH. The same pump is in a lot of Volvos and the LPH demand is regulated by the FPM Amps. I would think if you pulled out another mechanic book and looked up, lets say a S40, it would say 150LPH 13V @ 9A.
It's been a while since I switched over to a Walbro... about 5-6 years. I believe at the time I tried my best to research it because I couldn't get an answer here. I started with R_rated's car and talked to Josh at the time about what he used I believe the number to look for after the 255LPH hour is a out diameter size... but if you research 255LPH Fuel Pump for a Volvo S60 or just a plain old Volvo on Google or even volvospeed or one of those other sites, you'll pull much better results to your question.
Also, I would think if you installed a lower rated fuel pump and not a 255LPH... let's say a 190LPH @ 13V... and your FPM sent a 4 or 8 Amps to one side or whatever the current demands, that it would fall short.
I'm working at a Hospital this week in Honolulu, so I'm not on the forum as much, but I'll check back later. I'm interested in what you find.