2020 L8T fuel pressure Sensor

[CriticalAction]

Spoke for this 2020 L8T out of a 2500HD with 7k miles that has a cracked pan. The kicker is someone is selling local a Holley PN 550-1610 which is for the "early" LT engines with 4 pin connector. This L8T has the "late" 3 pin connector. Anybody know in here if the fuel pressure sensors can be swapped?



According to Rockauto the thread pitch is the same, maybe... In the pics they look the same except for the 3 vs 4 pin connector.

2014 GM sensor PN 12673824
10mm threads



2020 GM sensor PN 12708493
10mm threads

 

[Fastereddie]

The 3 pin and 4 pin can physically be swapped, but the harness and computer have to match.

 

[CriticalAction]

The 3 pin and 4 pin can physically be swapped, but the harness and computer have to match.

Absolutely. That Holley PN is the complete kit with computer and harness. He's selling it at less than 2/3 what the kit is from Summit/Holley.

My hope was for the cost of a $50 fuel sensor i could save over a thousand using that earlier Terminator kit being sold on FB.

Based on what you said it sound like that is feasible.

 

[CriticalAction]

So i called Holley because I wanted to be sure. Figured i should add the info here for anyone else running into this.

My question was of course why would Holley make two kits if you could just swap the sensor early vs late and be done?

Well Greg at Holley said right away the official statement from GM on the LTs is you can not swap the fuel pressure sensors early vs late on the same fuel rail.

If you swap the sensor you have to swap the equivalent fuel rail as well.

The thread pitch is the same but the angle of the sealing surface on early vs late are different. They WILL leak according to Holley if you do this swap without doing the fuel rail as well.

 

[Fastereddie]

So i called Holley because I wanted to be sure. Figured i should add the info here for anyone else running into this.

My question was of course why would Holley make two kits if you could just swap the sensor early vs late and be done?

Well Greg at Holley said right away the official statement from GM on the LTs is you can not swap the fuel pressure sensors early vs late on the same fuel rail.

If you swap the sensor you have to swap the equivalent fuel rail as well.

The thread pitch is the same but the angle of the sealing surface on early vs late are different. They WILL leak according to Holley if you do this swap without doing the fuel rail as well.

Thats interesting, because i’ve seen it done in person.

 

[CriticalAction]

Thats interesting, because i’ve seen it done in person.

I would've bet money you were gunna say that lol. Not sure what to tell ya. Just writing down what they said.

 

[Fastereddie]

The bigger issue is the transmission you plan to run. You want to match the year if transmission to the ecu/harness/fuel sensor.
If you have the 2020 trans that goes with that engine, you have to have the newer setup. Holley direct injection control is pretty new and hope someone can tune it…

 

[Fastereddie]

And the holley doesnt work with the 6-8-10 speeds.

 

[CriticalAction]

The bigger issue is the transmission you plan to run. You want to match the year if transmission to the ecu/harness/fuel sensor.
If you have the 2020 trans that goes with that engine, you have to have the newer setup. Holley direct injection control is pretty new and hope someone can tune it…

That specific kit included 4l80e transmission control. Wasn't planning on doing anything with the 6 speeds or higher.


And as far as I knew it tuned itself with the wideband O2 just like the other LS Terminator systems?

 

[NDM]

And the holley doesnt work with the 6-8-10 speeds.

My 72 k5 with an L8T and 6l90e is using holley but I basically threw away the holley 6l90e controller and tune the 6l90e with Hptuners. The engine is tuned with holley software.

I never got the holley 6l90e controller to work correctly.