Injectors work with manifold off but not on
 

Hi guys it’s been years! my dad came to visit and said “let’s put some work on the Fc”. My t2 has been sitting for a while but it had been running. Today we cranked and nothing. This is what I have so far:

-good fuel pressure
-proper current to injectors from ECU
-Brand new flow tested 1000cc (4x) injectors

we had zero fuel in rotor 1 and just a bit in rotor 2 after cranking. We took it apart and while testing injectors my dad made the mistake of confusing injectors and tested the secondaries instead of the primaries but something interesting happened. While having all injectors connected and only the secondaries out the car started with the whole damn manifold apart. Checked spark plugs and now I have fuel on both rotors.

So with the manifold on I get no fuel. Manifold off I get fuel.

Confused and trying to see what could be going on.

thank you everyone in advance.