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check and adjust the injection timing of the pump and set it to spot on as any degrees retarded will affect performance. Check that there is no boost pressure from the turbo being lost from loose hoses and cracked tubes and intercooler. If you engine has a air compressor with a coiled steel line attached to it before the line is connected to a rubber hose to the tank Then replace the coil as it blocks up with carbon and puts the air compressor under constant load. Check for worn brake pivots as dragging brakes use up HP Finally have the truck chassis dyno tested to check for full pump operation as I had experience where the pump was fully rebuilt but the cam bearings in the pump were not replace and the pump was way off setting. ON a chassis dyno tested in direct gear the reading should ne around 410 hp at the rear wheels depending on the tread of the tyres. The test will show at what rpm\'s the governor in the pump is not performing as the power curve will not follow the set line.