Would this be a replacement on a 2004 suburban Z71?

Worked on 2004 5.3 suburban. Wired it up closer to the engine bay. The old unit was too far down the line and the wiring went bad to ground. This is just a more modern version with a much easier install. They all produce the voltage necessary by the computer. You will need new fuel line for this install and the pigtail as they are different. Possibly use the old lines near the intake and route it back the manifold input. Or just remove all the old lines and start fresh. The old fuel lines were terrible on my truck and i had to replace the 170000 mile old pump anyway.

hello， I want to know the difference between 13507128 and 13577429 their prices are not the same ，i want to know which one should i buy？

There are two versions of this sensor. One has the ability to measure fluid temperature as well if your aftermarket ECU supports it. Good luck!

Acdelco Gm Genuine Parts 13507128 Flex Fuel Sensor

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VT28577

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Description

⚡ Drive smarter with GM’s flex fuel sensor — precision that fuels your edge!

PRECISION FUEL MONITORING - Ensures your engine gets the perfect air/fuel mix every time
OPTIMIZE ENGINE EFFICIENCY - Real-time ethanol content data powers smarter ignition timing
GM RECOMMENDED AUTHENTICITY - Factory-spec replacement trusted by General Motors
DURABILITY MEETS PERFORMANCE - Built to withstand up to 125°C for long-lasting reliability
SEAMLESS VEHICLE INTEGRATION - Engineered for exact fit, form, and function in your GM vehicle

The ACDelco GM Genuine Parts 13507128 Flex Fuel Sensor is a factory-recommended, precision-engineered sensor that monitors ethanol content in flex fuel vehicles. With ±1% accuracy and a robust design rated for 125°C, it delivers reliable data to your engine control module for optimal air/fuel mixture and ignition timing, ensuring peak performance and efficiency tailored for GM vehicles.

Specifications

ASIN	B073ZQ1G2P
Best Sellers Rank	#30,166 in Automotive ( See Top 100 in Automotive ) #6 in Automotive Fuel Injection Pressure Sensors
Brand Name	GM GENUINE PARTS
Customer Reviews	4.7 4.7 out of 5 stars (470)
Global Trade Identification Number	00808709652618
Included Components	Flex Fuel Sensor
Item Dimensions	10.9 x 9.7 x 3.3 centimeters
Item Type Name	Flex Fuel Sensor
Item Weight	50 Grams
Manufacturer	ACDelco
Material Type	Metal
Measurement Accuracy	±1%
Measuring Range	0% - 100%
Model	13507128
Mounting Type	Surface Mount
Output Type	electrical signal
Part Number	13507128
Specific Uses For Product	vehicle operation
Style Name	Modern
UPC	808709652618
Unit Count	1 Count
Upper Temperature Rating	125 Degrees Celsius

Reviews

M**D

100% genuine flex fuel sensor. Very happy

24.02.2026

J**R

Works as it should. Reads my e85 perfectly.

14.11.2025

D**D

Description of the product could use some refining. But this is an AC Delco (Continental) OEM GM flex fuel sensor.

28.09.2025

B**.

Tried to make it work properly over several days, kept switching between 2 and 10 % alcohol content, finally switched for a bigger Continental model, and this one worked properly. I don't know if it was a bad unit, or if it's just cheap and imprecise.

2.12.2022

M**B

100% OEM. people worry about ordering these ethanol sensors now because you can never tell when your sold a fake. i compared this to the original i had from the GM dealership and i can confirm this is 100% OEM

4.04.2026

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