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PN# 13500745 Fuel Pressure Sensor 2012 Sierra 5.3L

Bad Bowtie2
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Bad Bowtie2 Enthusiast

Bad Bowtie2

Posted
Posted

What really is the use on this hard inline fuel pressure sensor? I know there is a 2nd fuel tank pressure sensor which effects filling up our gas tanks- But it is a different animal.

 

I have a 2012 GMC Sierra C1500 5.3L I bought new. It now has 140,000 miles on it. I have only used original GM parts on this truck. New GM O2 sensors, spark plugs & coil wires were installed at 100K- Just for maintenance reasons. I had all of the AFM crap removed round this time too. I had a GM master tech install a non-AFM GM 6.2L cam and a GMPP Performance roller lifter set. Then a local programmer installed a mild 87-Octane tune.

 

I had an old mass air flow sensor code 2 weeks ago. "Perimeters out of sync". It is the original mass air flow sensor and no maintenance had been done in it's lifetime, so I bought some CRC brand electronics cleaner and "refreshed/cleaned it".

 

I had a Code P0171 flash up on Monday. Check engine light has remained on steady-No flashing all this week, and it has never cleared itself. I experienced a hard jerking while using my cruise control at 65MPH yesterday, during lunch. The truck ran fine this morning coming into work on the same 65MPH highway.

 

I have an appointment on Monday to see an old GM master certified tech, who now works on the side, and is very good young man. Same tech cleared an alcohol monitoring sensor last Friday. He said my trucks was flooding itself thinking I had E85 in my gas tank?? Said alcohol content was reading above 61%!! I only run 87 octane 10% gas in this truck.

 

I have no scan tools, nor diagnostic means here. 

 

Just curious if this fuel pressure sensor (PN# 13500745) is the same sensor that also reads the alcohol content?? I can not find it anywhere in my parts schematics. It is my understanding these 2007.5-2013 GM trucks used the very first, and rudimentary, alcohol monitoring sensors?  If this isn't the one in the same sensor, where is it?? I believe the 2014+ GM trucks sensor was vastly improved for future use and moved elsewhere in the fuel delivery system??

 

Brainstorming in Texas....

 

 

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Correct, there is no sensor. It's called virtual flex fuel, it takes readings from the o2 sensors and others to generate an alcohol percent.

 

The only way to disable virtual flex fuel is to turn it off in the tune. You can contact the place that did your tune and they can update it with that change.

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swathdiver Senior Enthusiast

swathdiver

Posted
Posted

Alcohol content is determined by the oxygen sensors.  Aftermarket sensors, even Densos in their original packaging do not play well with the computer system, they are not set up to work properly with the computer system.  Also, once the sensors get to about 100k miles, even while working fine for their main job, begin to get lazy in calculating the oxygen content.

 

The FPS is part of the fuel pump assembly on top of the gas tank.

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