⚡ Drive smarter with GM’s original flex fuel sensor — precision meets performance!
The ACDelco 13577429 GM Original Equipment Flex Fuel Sensor is a GM-recommended replacement part designed to monitor ethanol content in flex fuel vehicles. Manufactured to GM OE specifications, it ensures perfect fit, reliable performance, and durability under high temperatures up to 250°F. Compact and easy to install, this sensor helps your engine control module optimize air/fuel mixture and ignition timing for efficient operation.
| Brand | AC Delco |
| Item dimensions L x W x H | 4 x 4 x 1 inches |
| Item Weight | 0.05 Kilograms |
| Style | Modern |
| Mounting Type | Flange Mount |
| Output Type | Analog |
| Specific Uses For Product | automotive, motorcycle |
| Upper Temperature Rating | 2.5E+2 Degrees Fahrenheit |
| UPC | 808709571094 |
| Global Trade Identification Number | 00808709571094 |
| Manufacturer | AC Delco |
| Model | Flex Fuel Level Sensor |
| Item Weight | 1.58 ounces |
| Product Dimensions | 4 x 4 x 1 inches |
| Item model number | 13507129 |
| Is Discontinued By Manufacturer | Yes |
| Exterior | Machined |
| Manufacturer Part Number | 13507129 |
| OEM Part Number | 13577429 |
K**B
Great for DIY Flex Fuel Sensor
Way better than flex fuel kits. Made my own flex fuel kit for under 250 total for a 2019 bmw 330i and works perfect
C**G
Works
Works appropriately and as expected.
L**A
Works out of the box with Hondata KPro V4
Cheaper than buying a whole flex fuel kit and worked perfectly with my KPro V4 to add flex fuel capability to my K24 swapped EG
J**N
Great product
Used for a E85 conversion on my 2010 Camaro, has been holding up so far and worked well on the dyno, great for aftermarket use or OEM
A**E
Fixed GMC Sierra P0178 error
Super easy to replace. Start C with a cool engine and catalytic converters. Check online how to release fuel line pressure before removal - and be prepared to catch a lot of fuel.
D**L
Essential component of DIY flex fuel system
I coupled this sensor with a home-built arduino setup to measure the ethanol content of the E85 I'm using in my 300ZX. The sensor functions exactly as expected. I haven't been able to compare it to a known test result, but I've seen 9% reported for the E10 fuel in my area, and I'm seeing between 75% and 80% ethanol content in the E85 in my area (the spec allows something like 52%-83% ethanol) so I'm pleased with the results.
S**G
Doesn't work
Sensor reads 0-209%ethanol
S**
Used for E85 in Miata
Used in a 1993 Miata to run flex fuel E85 with A Speedy EFI ECU. Simple Install. I only use this car on road course tracks, but it has been working well with no issues.
Trustpilot
1 month ago
2 months ago
