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Truck Stalled After Starting

THEFERMANATOR said:
That's an o-ring on that stub which is teh power feed wire to the fuel heater. ADVANCE now sells a rebuild kit for the filter heads. DORMAN # 904-124 for $23.99, and most stores stock it. Also ONLY run the metal filters, not the palstic ones which are prone to losing there seal and letting air in.
Click to expand...

Plastic: like WIX leak around the WIF sensor and are known to let the WIF sensor fall clean out of the filter.

The OP's 1st post is exactly an air leak. Air leaks can also show up as low rail pressure and limp mode under full power. GM eliminated the troublesome liftpump, but, introduced a troublesome filter head...
 
Got the kit a NAPA #827-0110 Primer Seal Kit - $23.85 with AAA discount. Kit came with instruction with color photos.

Real simple job: 12mm wrench for mounting bolts, T-20 screwdriver, flat blade screw driver for hose clamps bellows btween air filter and turbo inalet, and a pair of pliers for hose clamps on the fuel lines. 30 minute job. Replaced fuel filter before I put it back in the truck.
 
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