I put a 180 petrol one on mine as my pre project drive one failed - it is a weak area it appears on these.
Problem with using the petrol one is that that it doesn't have the small internal swirlpot, so fuel levels have to be kept up or you'll suffer from poor starting issues when 1/4 of a tank 
http://forums.mg-rover.org/mg-zs-rov...l-tank-512139/
here's a good thread from .org where they go through the "issues" of using the 400 tank on the diesel - essentially the same as using the 180 petrol on the diesel.
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Mods Fitted
Pipercross Filter; Full 2.5" 'Wingy' exhaust; Donny Custom Turbo outlet pipe; Custom injectors;
Uprated gearbox bearings; Helix Clutch; Quaife ATB; Upgraded clutch Hydraulics; FMIC; Ported Head; ARP headstuds; Leda coilovers; 'Brembodge' 326mm disks/DS2500 pads
Dieselpowered
Fitting Custom Hybrid Turbo (1856GTBv) & controller; Remap, swirlpot, lift pump
AMW Motorsports
Custom exhaust manifold & downpipe
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