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Looking for ideas here. I am doing a complete fuel system replacement since I confirmed a HPFP failure. I’ve got everything apart and dropped the tank. Last step before assembly is to flush the low pressure lines from the engine compartment back. What’s the best way to do this? Are there any valves in these lines? Can I shoot wadding through it with compressed air? Or can I just flush it with copious amounts of diesel?

replacing them seems nearly impossible with the cab on
 

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The frame lines back to water separator/filter are not part of the catastrophe kit. You flush them while the tank is down to do tank clean out. Take the lines off that filter hosing and blow-flush the front sections nd thn the rear sections. Get after the filter hosuing aire and see that there is not any metal particles hiding in it.
 
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