I doubt it would be the fuel pump. That should be a different circuit.
The pressure regulator is a diaphragm-operated relief valve with injector pressure acting on one side
and air cleaner pressure acting on the other. The pressure regulator maintains a constant pressure drop
of about 10 psi (.7 kg/cm2 ) across injector(s), throughout all engine operating conditions. The model
700 fuel pressure regulator may be disassembled and repaired.
Saturday, October 8th, 2011 AT 4:34 AM