Babies no well II
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 connecting the fuel pump on a direct feed primes the engine and she fires,,, bur when live feed disconnected engine dies of fuel starvation 
 
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 Isn't your pump meant to have a live feed all the time so that it can feed the injectors with fuel? It's gonna stop if you dis-connect it. Maybe your OE live feed is, immobilised or a fuse or relay in the fuel pump circuit is not function correctly….!