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I have a built evo x 2010, wont prime when i turn key to power, can slow cranks and will start after a while cranking maybe 2-3 tries, ive tested pump and its working.
 

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The fuel pump primes as the engine cranks. If you powered the pump with 12v on its own and you can hear it go, than check your fuel pump relay. The slow crank also is odd, check your battery to make sure its good and do a compression test, if I remember correctly, slow crank can be a sign of low compression
 

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Yes correct. You can manually prime the pump by turning the key without depressing the clutch
 
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