this happens mainly down to air getting in the system when the fuel filters are dirty, always check filters 1st then move onto these easy steps to release the air for the system and your engine will fire! repeat this process of cracking the nuts on the injectors if it doesn't work first time. as long as you have fuel coming out the injectors whilst spinng the engine on the key the bubbles can escape and you should even see them before the engine fires !! good luck hope this helps :)
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