To put what Bill said into context... the S3 pump fills a swirl tank that feeds a pair of Bosch 044 pumps... IIRC Bill calculated the swirl tank would potentially empty in around 45 seconds at full chat...
<tuffty/>
er, yea.. that makes more sense
S3 in tank fills 2ltr swirl pot, off which feeds 2 x Bosch 044, which blow thru -8 to the fuel rail(s) up front to Aeromotive FPR and returns to swirl pot in -6 and then back to tank.
3.3ltr no load gives me a limited limt on full chat.. 40 odd secs as tuffty says (by calculation never tried it) before emptying the swirl pot.
3.3ltr no load is best flow conditions remember..
A lot of BT builds need healthy in tank S3 pump + inline DA-31/bosch 044 as well...
My S3 pump has been in my tank since 2003 when I was IHI'd way back, on low 300bhp and was adequate then