My K2500 Suburban is powered by a vortec big block, aka 7.4 vortec, or L29. Probably one of the most common problems with the 7.4 vortec is a hard start condition caused by leaking fuel injectors and the fuel pressure regulator. In this video I'll replace the faulty parts with new, but instead of just using stock parts, we're increasing the capacity of the injectors by almost double. I'm using some FAST injectors and an OEM fuel pressure regulator, and HP Tuners to make the adjustments inside the computer.

FAST 36 lb/hr injectors (rated at 43 psi)
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AC Delco fuel pressure regulator
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HP Tuners MPVI2
https://amzn.to/2TU1stv

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#bigblockchevy #suburban #454

Chapters
0:00 The MOST COMMON L29 Problem
1:58 Future Big Block Plans
2:30 The Parts I'm Using
4:59 Tear Down
9:00 Tips and Tricks
11:26 ReAssembly
14:54 Will it Start?
15:15 Tune for Larger Injectors
16:16 Installation Notes
18:02 Lazy Technicians make me ANGRY
19:49 Hot Restart Test
20:58 Datalog Results