Im thinking its a standpipe or dummey plug that when it cools down the seal shrinks and it begins to leak off HPO pressure it takes a longer crank to fill the HPO system back up and start
the HPO rails ontop the injectors need to come off to change those
Now its not very common to leak at the HPO rail to injector connection but
Theres an oring in the top of the injector that seals the HPO Rail to the injector its not very common for it to leak here to change those theres a little clip that needs to be pulled of the top of the Injector and then the oring fished out and a new one installed
I think if it were the STC fitting it would leak constantly and your Icp would be low number and IPR% would be High number so I dont think its the STC fitting
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Benny
2003 6.0, 4X4 srw, short box, born on 3/28/03 Moog ball joints,DC POWER 190A ALT
4 inch turbo back magnaflo exhaust,no kitty, 6 in. lift, BFG 315/75r16, python remote start alarm,pioneer system2 12''subs 1600watt amps ,scangaugeII,coolant filter, blue fuel pres spring, Fresh oil cooler 6/1/11 Final Charge Cat EC-1 rated Silicate Free ELC coolant, Sinister Full egr deleate, Mobil 1 5w-40syn,updatedHPO screen,updated oil filter stand pipe
The Alliant Power kit has them, AP0002. I ordered them from Oregon Fuel Injection. It is a pain to replace the top injector though, you need a very good punch and some patience. I replaced all the o-rings in mine when I had them out.
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