| From our experience, NA and TT fuel pumps are visually the same from the outside if dettached from the hangar/mounting assembly. However, the TT pumps are capable of delivering considerable more fuel and can support nearly twice the horspower. At Z1 with so many spare parts lying around we have always had a dilema figuring out which pumps were which when someone makes the mistake of not labeling them.
We recently discovered, if you cut the rubber jacket off of the fuel pump there is one set of characters that is specific to the NA and TT pumps. After looking at several pumps we discovered how to tell the difference. 
All the Z32 pumps appear to be stamped
A42-621
However after than the TT reads
B71
While the NA is stamped
B67
After it is determined which pump it is you can wrap the rubber jacket back around the pump and put the clamp back around it and your good to go. Maybe this will help someone out of the same dilema we've faced for years.
JT Z1 Motorsports 770.838.7777 One stop shop for all your Z32 parts, service, and performance needs
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How to tell the difference between NA and TT fuel pumps - 
