The only things in the circuit that restrict return flow are the control
pressure regulator and the line pressure regulator. IIRC the line
pressure regulator puts about 5 bar+/- to the top of the fuel
distributor where it flows around the plunger to the bottom side of the
fuel distributor where it is regulated according to the temperature of
the bimetal strip inside to a pressure rising from 1.4bar to 3.7bar and
then whatever volume is left over with the injectors closed is bypassed
to the return line at very little pressure. So the answer would be yes.
Since the plunger is a spool valve the amount of return flow would
depend on the position of the plunger. Tap on the top of the fuel
distributor and see if it breaks loose.
Bob
