What should the pressure be on the fuel rail?

With engine running, observe the Actual Fuel Rail Pressure parameter with a scan tool. A normal reading would be approximately 40 MPa (5,802 psi) with the engine cold, and 30 MPa (4,351 psi) at operating temperature. Inspect the fuel supply lines for damage between the fuel tank and the fuel injection pump.

What should vacuum pressure be on Duramax diesel engine?

Attempt to start the engine. ⇒ If the engine does not start, refer to Engine Cranks But Does Not Run . Install the J 44638 to the fuel rail service port and slowly increase the engine speed until reaching wide open throttle (WOT). Vacuum should be less than 5 inches Hg of vacuum.

How does FRP sensor work on Duramax diesel engine?

The FRP sensor uses a 5-volt reference circuit , a signal circuit, and a low reference circuit to monitor fuel rail pressure. This information is sent to the engine control module (ECM) to assist in the fueling of the engine. • DTCs P0090, P0192, P0193 are not set.

After reassembly, the car would turn over but not fully start. After some research and comparison of live fuel rail pressure before (~1600 psi) and after (~3600 psi) provided by my BlueDriver scan tool I decided to disconnect the fuel rail pressure sensor and it fired right up.

How is the pressure in the common rail controlled?

Common Rail Injection System Pressure Control. Abstract: There are several approaches to control the pressure in the common rail. One early approach method was to supply more fuel than is needed to the common rail and use a pressure control valve to spill the excess fuel back to the fuel tank.

What are the symptoms of low fuel pressure?

Low Fuel Pressure Symptoms & Causes 1 Unresponsive Throttle. All cars require proper fuel delivery to their cylinders in order… 2 Difficulty Starting the Car. Low fuel pressure will also make it hard for you to ignite your car’s… 3 Stalling Engine. If your car’s engine stalls while running, it is a clear sign you are having some…

Why does the common rail injection system have a delay?

One important reason for this is that the system now includes a delay introduced by the high pressure pump. Metering the pump’s inlet flow will have the longest delay since the system delay includes the pump’s induction and discharge strokes; as a result, relatively higher rail pressure fluctuations can be generated [ Bosch 2007].

What should the pressure be on the fuel delivery switch?

This switch will read “low” if the low fuel pressure is not correct. If the low side pressure is good, it will read “not low”. It is also a good idea to check supply pressure with a gauge. The minimum pressure allowed before the fuel delivery switch engages is 52 PSI. Normal pressure is between 53-73 PSI per Ford.

What should the rail pressure be on a Sprinter diesel?

Check rail pressure when engine is off, it should be 0 PSI (+/- 500 PSI). Aerated or restricted fuel supply. Excessive idle time can cause white smoke when cold due to carbon build up on injector tips. More than 20% idle time is excessive. 2007-2009 model years use an electric supply pump in the tank to feed the CP pump at 59 +-2 PSI.