LT4 HPFP and Injectors... Correct sensor?
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Teching In
Joined: Mar 2009
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LT4 HPFP and Injectors... Correct sensor? Hi guys ive had trouple with a tune since installing the LT4 upgrade. HPFP and injectors. Truck is sierra with a built L83 I get 95050 pressure reading in HP tuners. Ive tried two stock sensors.
I suspect the l83 sesnor is geting pinned as its not made for the LT4 pressures. I ve ordered 12708493 form AC Delco. This is stock for a Zl1.
Has anyone had this issue or done a LT4 pump ane had to also upgrade the fuel rail pressor sensor. It makes commoon sense to me that this would need to be changed but wanted to check since pulling the blower is not the easiest job in my truck ..
Specs, l83, OE crank Carillio rods, forged and coated pistons, studded head bolts, GPI ported heads, BTR PDS cam, Magnuson 2650 super charger, LT4 HPFP and injectors.
hoping for 700 wheel at 12-14 lbs.
I suspect the l83 sesnor is geting pinned as its not made for the LT4 pressures. I ve ordered 12708493 form AC Delco. This is stock for a Zl1.
Has anyone had this issue or done a LT4 pump ane had to also upgrade the fuel rail pressor sensor. It makes commoon sense to me that this would need to be changed but wanted to check since pulling the blower is not the easiest job in my truck ..
Specs, l83, OE crank Carillio rods, forged and coated pistons, studded head bolts, GPI ported heads, BTR PDS cam, Magnuson 2650 super charger, LT4 HPFP and injectors.
hoping for 700 wheel at 12-14 lbs.
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Joined: Apr 2026
Posts: 1
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From: Central MS
Did you find out anything out on this issue? I am doing an L83 and looking at doing this Lt4 upgrade, I have not found any info on if I even need the HPFP with the LT4 injectors much less any other issues that come out of the swap. Any info would be great.
