Sorry I did not see this thread sooner, I could have told you that a 930 will run in "limp mode" on the rear pump alone.
A buddy of mine hit a 18 wheeler's retread on the way to the track once and it took out the front pump. He was able to get it home using the rear pump alone and no boost.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8