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Hi,
Go after the fuel pump check valve first and observe the fuel accumulator closely for any leak, and while running.
I've seen some CIS Injectors on eBay. It would be good to replace the set at the proper price.
Since your car is CIS, it is the LINE PRESSURE REGULATOR that seals the return line, and it consists of a spring and small plunger inside of the control unit. Remove the plunger and either polish it or replace the entire assembly.
Again, make sure to check for ANY external leak while the car is operating, including the tank bung and hoses.
Goatman
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