Originally Posted by tinman
Recently purchased a used ambulance for a work vehicle. 1994 Ford E350 Van 7.3 Diesel, Great work truck. I am a HVAC contractor. Truck ran great until it got cold. Now I have not been able to start it for three days. That is what brings me here. Yesterday I replaced the batteries. The block heater is not working, but I have a new one on the way. Replaced the fuel filter but still not starting. Is there a special procedure you need to go through after replacing the fuel filter. I have no clue why that schrader valve is on the top of the fuel filter. I would also like to know where the location of the glow plug relay is on that engine. I really like the truck and the diesel engine unfortunetly I do not know anything about them. But I am learning quickly.
Welcome to powerstroke.org
If its a powerstroke valve on fuel filter is water separator open it till fuel stops running out.
if your engine block heater doesnt work try turning on key and let glow plugs cycle for a full minute after wait to start light goes out, crank it for ten seconds then let it set for a minute, then start over, but let glow plugs cycle twice.