7783911 -
You do not identify the model year but certainly a CIS fuel system.
CIS runs on high fuel pressures, and should not have hose clamps on the Pump (pressure) side of the fuel system.
Only CIS model years using hose clamps were 73.5 and 74, and after that Porsche went to crimped fuel connections.
Just a word to the wise. Fuel leaks and fires are a big NO NO.
Len