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Ouch..I assume when these vehicles are straight from the military..yet again this assumption trapped me. Glad you got it fixed easily

If the thermal compensation leaf is solidly attached, there is no reason to replace without further testing. If you had a soldering iron, using it to heat the leaf would be a positive test. Beginning to think the prior owner adjusted the external idle speed, not knowing about the cold idle...

Looks clean. Metering valve looks like it moves freely. Try bumping idle speed, external screw on throttle arm. Realized with pump installed, you cannot spin it with a drill to see governor function. Thermal compensation looks ok.

Ohh, a 4544. This is a 1986 year model HD pump with 54 mm^3 per stroke max fuel..range is 49.5 to 54 mm^3. Uses the 28370 governor cage so no flex drive ring to cause problems. Get some Diesel Mechanic in a Bottle, remove governor cover, drain as much diesel as possible and inspect the...

Before you tear into the IP, find out which calibration spec the pump was last built. The ID tag is on the drivers side body, stamped in metal. The pump is a DB2829-nnnn. The nnnn is the calibration spec. If an early model, it could have a flex ring governor coupling, these degrade and plug...

Check cold, the riveted part on the arm must be tight and the spring should be up against it. The rivets can loosen, reducing the effectiveness of the temperature compensator. When the fuel heats, the compensator bends slightly towards the spring. The type of governor here is a...

The part is easy to inspect, only removing the IP cover required..you will lose about 25 cents worth of diesel 😣. A tight fitting screwdriver plus a tap with a hammer helps, seen more than one screw snap off. The thermal compensator only moves off the governor arm by about 0.003" at 150°F...

https://www.motortrend.com/features/0809dp-stanadyne-db2-injection-pump/ "Retention of heat is a critical factor in fuel thinning after a high-ambient heat soak. As the hotter, thinner fuel passes through the pump, internal leakage increases and reduces fuel output. To compensate for this loss...

Hot stall can be inadequate fuel return from the injection pump. The governor cage and weights spin at half crank speed, submerged in diesel which acts as an effective heater if fuel return is blocked. More importantly, if case pressure rises due to a blockage in fuel return, this will...