Air sound from pump before start up

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It's about the injector copper washers as i've already said... if it's that and the leak becomes serious it will start very hard from cold
Thanks what other things can I check myself in the meantime? If it was cracked head would the oil fill with diesel right?
 
Update: my lovely mechanic has the injector seals booked in for next week, he mentioned a few other things that it could be including the dreaded cracked head but the injector seals are apparently the next less expensive thing to try so fingers crossed ay
 
Injector seals done, yesterday along with a few other things inc a pace sealed injector harness and hopefully I can wrap this thread up by saying it’s sorted, never a problem starting the engine but it seems to start even better and running a little quieter
 
Thank you, I wouldn’t hesitate in recommending twinwoods 4x4, they literally sent me everything that was needed and more, even my mechanic was impressed
 
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