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Depends on the type of diesel engine. New common rail engines do not need bled as a rule because the low pressure pump in tank bleeds it for you. It is not a good idea to mess around with these engines as the fuel pressure is so high it could seriously hurt or kill you(do not release injector pipes!!!). Conventional diesel engines are different, there is sometimes a primer/lift pump on or around the fuel filter, even earlier engines had lift pump on block that could be toggled to prime fuel up. Rotary fuel injection pumps have a lift pump fitted in them so they self bleed but its still necessary to crack open the injector pipes to bleed air to the injectors. Unable to give specific directions as i dont know what engine you have
if you need to bleed diesel fuel system u need to first find where air got in then you can crach a fuel line enuff to allow fuel to leak out when engine is turning over once engine fires tighten fuel line again the rest of air will burn or secape by itself
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