454 swap starts but wont run

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Mikeycook97

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Starting off, i have a 1998 chevy k1500, took a engine, and full engine harness out of a 1998 chevy c2500, engine was 7.4l ran awesome drove it on trailer perfect. Pulled both engines. Put 7.4l in 1500, got whole drivetrain setup. Went to start it.... it starts beautiful but dies after a second.

Fuel pump is kicking on, never messed with spark, yes i used the computer out of c2500. Tomorrow i am going to try, unplugging the maf and starting it, and seeing if fuel pump relay could be loose. I also had to convert the power steering pump from the 350 to the 454 so i had to put the vaccum on the intake. Im gonna try plugging that too.

Any help appreciated. Thank you in advance!
 

90halfton

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Are the fuel pump requirements from the 7.4 the same as 5.7? Same size fuel line? Idk and have never done this swap. Just throwing it out there....
 

Mikeycook97

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My works compuyer system shows fuel pumps are the same. Gurl lines are same size too. Im thinking something to do with fuel pump relay
 

Mikeycook97

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It ended up being security. Turn key on for 10mins, turn off. Then back on for 10mins, then off, then back on for 10mins and start and wallaaa it worked!
 
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