David Lange fought many problems with fuel pressure regulators, and has developed a solution from his shop, Fuel Curve West. - Super Chevy Magazine ...

Next, check for a leaking fuel-pressure regulator. A leaking regulator (usually caused by a ruptured internal diaphragm) can allow raw fuel to be drawn through the vacuum line and into the intake.

Knowing how your car's fuel pump operates is always helpful, but here are very convenient ways to check if it is broken or has stopped working.