Medium
15-30 minutes
This manufacturer-sourced part is specially designed for Briggs and Stratton engines that are commonly installed on a variety of lawn and garden equipment. It is an important component which provides a tight seal between connected components. Unfortunately, over time it will wear out and it may begin to crack eventually requiring a replacement. To ensure the correct repair procedure, refer to the appropriate diagrams for your model. Note, this high-quality diaphragm-carburetor is made of durable material and is sold as an individual item. A wrench set will be needed to take apart and reassemble the engine when performing this repair.
Diaphragm-carburetor 691871
OEM part for: Briggs & Stratton Engines, Toro
Part Number: 691871
$7.06
In Stock
Ships within 1 business day 
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Compatibility
This Diaphragm-carburetor will fit the following 2638 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
This item works with the following types of products:
- Lawn Mower Parts
- Engine Parts
This part replaces obsolete part #: 270989
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
water in carb
paul - August 24, 2022
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Nutdriver
drained system water removed from carb bowl and diaphram installed new parts
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Old brass float was leaking and needle tip was separating
Ryan - April 24, 2020
Tool Type
Lawn Mower
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Socket set, Carb cleaner
Replaced float with new nylon float and new needle from kit. Also replaced the diaphragm while I had it apart.
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Fuel pump wouldn't work right .
Donald - February 14, 2017
Tool Type
Generator
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Socket set, Nutdriver
Removed air filter. Took out 3 screws in pump installed new parts and reinstalled pump cover and air filter . Started generator and adjusted carb.
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The choke had to be partially engaged in order to run.
James - July 5, 2017
👍 1 of 3 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Wrench Set, Nutdriver
1. Removed the hood
2. Pinched off the fuel line
3. Removed the fuel pump located on the front of the carburetor.
4. Replaced the diaphragms.
5. Be careful not to lose the three springs or their locations
6. Reassemble
2. Pinched off the fuel line
3. Removed the fuel pump located on the front of the carburetor.
4. Replaced the diaphragms.
5. Be careful not to lose the three springs or their locations
6. Reassemble
Did you find this story helpful?
Thanks for voting and helping fellow customers!
OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
