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Re: '89 K1500 engine replacement help
The stock TBI fuel pump is not capable of flowing enough fuel to feed even a 300 hp engine without it going dangerously lean let alone a 400 hp one.
Replace the stock TBI fuel pump with a high volume in-tank pump with a flow rate of at least 255-LPH or an external mechanical fuel pump and a bypass style fuel pressure regulator returning the excess fuel to the tank using the stock TBI system return line.
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