Where is the return line on a fuel pressure regulator?
Where is the return line on a fuel pressure regulator? Also, a return fuel line, from the fuel pressure regulator. This return line is located, downstream of all the injectors. Most fuel pressure regulators, use a diaphragm and spring combination within its housing. Also, with a vacuum source on the top side of the diaphragm. What happens when a fuel regulator gets stuck? When the fuel pressure regulator gets stuck and builds up more pressure then it should; it’ll cause the injectors to deliver too much fuel; causing a rich mixture (high pressure) condition. The easiest way to test fuel...