What Is A PMD On A Diesel Engine?

So, what exactly is this PMD? Pump Mounted Driver is the abbreviation for Pump Mounted Driver. An FSD, or Fuel Solenoid Driver, is another name for the same item. (One is Stanadyne terminology, the other is GM terminology.) It’s a “black box” roughly the size of a deck of cards positioned on the injection pump’s driver’s side.

What factors contribute to PMD failure?

The heat generated by the PMD attached to the injection pump can cause the optical sensor within the pump to fail, as well as the gasoline losing its lubricating properties, resulting in mechanical pump failure.

What is the purpose of the PMD module?

The Fuel System Driver (FSD), sometimes known as the Pump Mounted Driver (PMD), is an electronic module that amplifies electrical signals from the engine PCM to the fuel control solenoid. The fuel solenoid cannot be actuated without the PMD, and the engine will not start. Stalling, no start condition, no start condition only when heated, and excessive cranking/hard start condition are some of the signs of FSD failures. Without a doubt, one of the 6.5L GM diesel’s flaws is the driver (and its location). Fortunately, there are a variety of options for relocating the PMD to a more suitable place and taking other steps to improve the unit’s reliability, such as adding a heat sink.

How do you know if you have a PMD?

Touch the pink wire terminal of the PMD connection with the probe of the test light. The light should turn on when the ignition is turned on. If this isn’t the case, troubleshoot the circuit. Next, make a solid connection between the CLIP of your test light and one of the positive battery connections.

How can I tell if my PMD is severe?

OR “How do I determine what to replace?” DIAGNOSIS: Simply said, if your check engine light isn’t illuminated and you’re experiencing stalling, you’ll almost certainly require a new PMD. You should have your codes examined if your check engine light is on. This is something that Auto Zone and others will do for free.

Why does my 6.5 diesel continue to stall?

THERE ARE TWO PRIMARY CAUSES. The PMD is the first and most common (also called FSD). Another option is to use the Optical Sensor included within the pump.

On a 6.5 Diesel, how do you test an injection pump?

Start the car to test the lift pump. Allow petrol to drain from the line into a container by opening the T-Valve for at least 30 seconds. If the engine dies or no gasoline flows out of the line after 30 seconds, your lift pump is broken.

My diesel truck cranks but does not start.

Low compression or a fuel delivery problem are the most common causes of diesel engines that refuse to start even while they are cranking. Check for any obstructions in the fuel filters and lines. The injection pump may not be delivering fuel through the lines to the injectors due to a defective solenoid.

When you run out of gas, how do you start a 7.3 Powerstroke?

  • Turn the ignition to the Run position for 30 seconds to prime the gasoline system, but do not start the engine. This permits the system to be primed by the pump.
  • Crank the engine for 15 seconds after turning it off. If it still won’t start, repeat the first and second tasks until it does (cycle the key). Take a break if the engine doesn’t start after numerous attempts at priming, then repeat the process until it does.
  • If the engine starts but stalls after a minute, wait another minute before trying again. Allow the powerplant to idle for a few minutes after it starts, then check for leaks before driving.
  • If the truck’s engine refuses to start, have it towed to a shop or a dealership’s service department for professional diagnosis and repair.

On a 6.5 turbo diesel, how do you bleed injectors?

When it comes to bleeding, all you have to do is crank the engine for 15 seconds at a time, followed by a one-minute starter cooldown period, and it will self-bleed. While bleeding the high pressure side, I prefer to crack one injector line loose; it helps to speed things up a little, but it’s not required.

On a 6.5 Diesel, where is the fuel shutoff solenoid located?

The fuel shutoff solenoid is placed right in front of the upper intake manifold, at the front of the injection pump.