6 liter diesel refuses to re-start when warm , cranks ok but feels choked for fuel , after 20-30 minutes of cool down , re-starts as if everything is fine , does lope in idle between 740-780 rpm , thought the 2005"s were past fords growing pains.
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mate, remove spark plugs and crank the engine over for 5 to 10 second periods with a 1 minute break in between (to allow for your starter motor to cool down) and you should be able to smell when they are clear, replace spark plugs and repeat process as necessary.
timing might be off, diesels are very sensitive to timing. or could be air in the fuel somewhere. i like to clean the air out by loosening fuel lines one at a time on each injector and tighting after fuel comes out while someone else tries to start it or while its running really rough from one cylinder not getting fuel.
in cold weather diesel gels up and sometimes causes a no start issue..a cetane fuel additive helps with this issue. if temps go below 20 degrees, add a quart per tankful of cetane to the fuel to help start on cold mornings. also diesels require more amperage to crank than gas engines do..thus a stronger battery is needed..
Good chance it is not getting fuel, or enough fuel. When the rig is cold, the choke is closed. As it warms up, the choke opens. If the metering jets inside the carb are dirty, they may not be letting enough fuel into the barrels. You could also have a vac leak that is masked by the choke until the engine warms up.
it starts from cold because the auto choke is on ,allowing a richer mixture ,try removing the sender unit in the tank and seeing if the connection from the pump to the outlet connection is ok or leaking causing a loss of fuel pressure
Some times the fuel line may be too close to the exhaust manifold or engine and can create a condition called vapor lock. This is where the fuel is heated to a vapor in the fuel line. This is easily corrected by just moving the fuel line away from the source of the heat.
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