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I may have con-fused you guy's... I read that like he knew how and was pointing to the syntex error in the TM. and not the first time for crazy instructions.Make or buy a 3-way wire. male one end. female another end. whatever for the third end. hook the male and female to the truck. Hook your multimeter to the third end.
You can measure the current flow easily. Pull the 54A lead, set the meter to measure DC current, positive lead to the 58A lead and negative to the IP pump connection post down in the rubber "Packard" boot. DO NOT miss and touch the pump body or any ground. Have one of the PVT's standing around turn the IGN sw to RUN and measure. Engine doesn't need to be running. Should be about 1/2 Amp. Not a lot.
What the history on this rig. That could add to the story. Maybe a picture too.
Guessing time.....
Solenoid maybe ??? Pop the top off the pump and poke around... Good time to bench check both solenoids and the electrical feed through with 24 Volt and wires, hardware. Check the "glass" check ball feeding the return line. There is small input filter too. My guess is leaning to bad IP or fuel cut-off mechanicals... busted, bent, rusted crudded up or just plain worn out. Take care on slipping in back into place. Little tricky with a wiggle wiggle.
Free guess with a shorted brain cell, CAMO
Manual >> https://radionerds.com/images/f/f4/Stanadyne_db2_operation_and_instructions_manuals.pdf
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