Humm a few seconds after kill - Ford Powerstroke Diesel Forum
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Old 05-16-2014, 02:40 PM
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Humm a few seconds after kill

Every time I kill my truck 30 seconds later something around the engine bay starts to hummmmm. Anyone know what this might be?


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Old 05-16-2014, 02:44 PM
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electric cooling fan????
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Old 05-16-2014, 02:54 PM
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Fuel pressure bleeding down, its normal. These trucks make quite a few noises while they are off
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Old 05-16-2014, 02:59 PM
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Fuel psi!!! Thanks the line was rattling. That it!!


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Old 05-17-2014, 08:57 AM
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Quote:
Originally Posted by 31 YNOT View Post
Fuel pressure bleeding down, its normal. These trucks make quite a few noises while they are off
Yep, Diesel @ 30000psi has to go somewhere
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Old 05-17-2014, 09:26 AM
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Quote:
Originally Posted by matty21 View Post
Yep, Diesel @ 30000psi has to go somewhere
Cummins CM2150 C3 injectors will hold PSI for weeks. Good surprise first time you crack a line open. Nothing like a good 24K psi squirt..

On the trucks you can also hear the DEF pump purge after key off when standing beside the truck box, That kinda hums to.
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