2020 Silverado 5.3 would it fit?

It would if you have the harness for it if not you are better off getting a E85 kit for your truck instead.

Does this sensor also measure fuel temperature?

Yes - this sensor also measures temperature. The ACDelco (or Continental) flex fuel sensor outputs a PWM signal that is from 50hz to 150hz for % ethanol content and encodes the fuel temperature in the PWM duty cycle. You need some specific circuitry or an intelligent ECU to extract both % ethanol and fuel temp from the signal pin that is in the 3-pin connector.

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ACDelco 13577429 GM Original Equipment Flex Fuel Sensor

ACDelco 13577429 GM Original Equipment Flex Fuel Sensor

Product ID: 201069210

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Details

Brand
ACDelco
Item dimensions L x W x H
10.2 x 10.2 x
Item weight
0.05 Kilograms
Style
Modern
Mounting type
Flange Mount

⛽Real-time ethanol sensing

🔧Durable, long-lasting build

⚙️Precision GM OE fit

Description

⛽ Upgrade your ride with precision fuel sensing — because every drop counts!

DRIVE WITH CONFIDENCE - GM-recommended component that maintains your vehicle’s peak performance.
DURABILITY YOU CAN TRUST - Built to last with premium materials ensuring long service life.
OPTIMIZED FUEL EFFICIENCY - Monitors ethanol content to fine-tune air/fuel mix and ignition timing.
PLUG AND PLAY INSTALLATION - Direct replacement sensor designed for hassle-free swap with your original part.
SEAMLESS GM OE COMPATIBILITY - Engineered to exact GM specifications for flawless fit and function.

The ACDelco 13577429 GM Original Equipment Flex Fuel Sensor is a precision-engineered replacement part designed to monitor ethanol levels in flex fuel vehicles. Manufactured to GM OE standards, it ensures perfect fit, reliable performance, and durability, enabling your engine control module to optimize fuel mixture and ignition timing for maximum efficiency and longevity.

Specifications

Manufacturer	AC Delco
Brand	ACDelco
Model	Flex Fuel Level Sensor
Product Dimensions	10.16 x 10.16 x 2.54 cm; 45 g
Item model number	13507129
Exterior	Machined
Manufacturer part number	13507129
OEM Part Number	13577429
Item Weight	45 g

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