FORD F450 SUPERDUTY 6.0 2003

Use pressure gauge to test fuel pressure. If below specs, try changing filter, but you probably need fuel pump.

does it have fuel pressure??is the auto shutoff (fuel cut off ) working..

You probably have an air leak in the fuel line. Air bubbles rise to the top-most area of the tubing and form a "vapor lock" . Find the leak, stop the problem! IT's probably a loose connection somewhere.

First, check the condition and operation of the following:

1) Spark plugs, leads and coil(s)
2) Air filter
3) Fuel filter and pump operation.

Is the check engine light on?

it's in our owner manual. the fuse chart.

go to motorcraft.com,pro center, tech info, owner guide, fuse chart in index.

try web resourceful .com for auto manuals online, what's wrong with the super duty? gas? diesel?

a misfiring engine wont have enough power to sustain a load thats why when you shift it dies.you need to retify the problem first.check for any presence of water in the diesel fuel.Not enough fuel pressure

Replace the glowplug relay.Its faulty.The glow plugs stay on until engine warms up.The engine temp switch then activates the relay to switch off.So it could be the temp switch also faulty.

Most probably air entered your fuel line going to the injector pump that is why the engine cranks but does not fire. You have to "bleed" the line. I'm not very familiar with F450 diesels but it's easy to locate the bleeder on the injector - it's a screw near the throttle. Loosen up the bleeder screw, crank the engine, if there's air in the line, bubbles will come out of the screw thread. Crank engine until only fuel comes out of the bleeder screw. When the engine is running already, tighten the bleeder screw.