Power the circuit. Put your multimeter to DC voltage. Place the red lead on the output of the circuit (i.e., the tip of the output jack), and place the black lead on a ground point. You shouldn’t have a reading.
C2 and C4 are DC-blocking caps. If you get a reading and those are installed correctly/not shorted, you may have a short somewhere with wiring/switching.
I don't think that that's going to be your problem, though. Any well-designed circuit will have decoupling capacitors at the input and output. Even if the delay unit did not have them, the pedals in the signal path between the fuzz/delay would decouple the DC voltage.