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The factory turbo direct pipe on the 2001-2004 Duramax's is very restrictive
but also through holding two world records:
can cause damage to other major fuel system components
If the engine is started within that time
5-2005 SPECIFIC POWER LEVELS AND FEATURES:
PureFlow R4SBC133 Raptor 4G 100 GPH Fuel Pump 01-10 6.6L GM Duramax BAJA-577815 The factory turbo direct pipeFeaturing Pureflow's 4G technology, this Raptor 4G can reliably deliver your Duramax engine up to 100 gallons per hour of fuel in a compact and quiet design, all backed by a lifetime guarantee. From the factory, your Duramax is not equipped with a low pressure lift pump. Rather, it puts all of the load on the CP3 injection pump to inevitably "suck" the fuel from the tank. While this may work okay for stock trucks, even those with a mild tuner are not
