Easy
30-60 minutes
This genuine manufacturer approved replacement part is designed for use with lawn and garden equipment. Fits 3.5 and 4 gross HP vertical crankshaft engines (pulsa-jet carburetors). This item provides an air tight seal for the carburetor. Includes a carburetor diaphragm and a metal spring.
To complete this repair you would need wrench.
• Disconnect spark plug
• Remove muffler
• Replace diaphragm and spring
• Re-assemble and test the unit
Kit-pump/choke Dia 391681
OEM part for: Briggs and Stratton, Toro
Part Number: 391681
$21.56
In Stock
Ships within 1 business day 
Product Description ?
- Classification: Part
- Weight: 0.03 lbs.
- Shipping: Ships Worldwide
Compatibility
This Kit-pump/choke Dia will fit the following 7172 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:
- Engine Parts
- Generator Parts
- Lawn Mower Parts
This part replaces obsolete part #: 391643
Customer Part Reviews ?
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What I needed for repair
What I needed for repair / re-conditioning of an older mower.
Guest -
October 12, 2021
Verified Purchase
Just what I needed
The part I ordered is what I needed but I ordered a spring that was not required as it was part of the gasket assembly. This was not obvious when I placed the order. I now have an extra spring. I have not installed the part yet but do believe it will correct my issues.
Guest -
August 3, 2022
Verified Purchase
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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.
Very bad engine misfire, could not be corrected with needle valve adjustment or carb cleaning
Richard - September 21, 2016
👍 4 of 4 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Socket set
1. Removed carburetor and separated top from bottom
2. Saw very slight wrinkle close to spring on fuel pump
3. Replaced membrane, pump spring and breather grommet. Likely only the membrane was worn.
4. Reinstalled carburetor and engine started right up and ran like new!
2. Saw very slight wrinkle close to spring on fuel pump
3. Replaced membrane, pump spring and breather grommet. Likely only the membrane was worn.
4. Reinstalled carburetor and engine started right up and ran like new!
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Lawn Mower wouldn't start
David - May 15, 2018
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
1-2 hours
Tools Used
Screwdriver, Socket set, Wrench Set, Nutdriver
I refused to send my vintage 1979 R & S lawn mower, (a now defunct lawn mower manufacturer from Fort Worth), to that great "lawn and garden supply store in the sky". I repaired it so it can mow the lawn another season. I keep the oil changed regularly and keep the blade sharp and balanced. The most frequently replaced part is the carburetor diaphragm. Disassembling and cleaning the carburetor, then replacing the diaphragm was the major problem keeping it from running well. These ethanol-based fuels aren't helping things very much.
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The engine was hard starting and the RPM’s surging up and down.
Walter - March 25, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Socket set
Removed the gas tank carburetor and then the carburetor and cleaned all. Replaced the Spring-Pump Diaphragm, Needle-Valve Kit, Diaphragm-Carburetor. Put all back together and reinstalled the gas tank carburetor. Took a little time to get the engine started, then adjust the speed and the engine runs with no more surging.
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Was not getting gas to the carburetor
Robert - June 11, 2021
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set, Nutdriver, Adjustable Wrench
Removed carb
Removed intake tubes
Removed old gasket/diaphragm
Removed needle valve
Cleaned carb with carb cleaner making sure all holes and crevices were clean use a small brush to help
Replace all parts with new parts
Put back together
Started perfectly
Removed intake tubes
Removed old gasket/diaphragm
Removed needle valve
Cleaned carb with carb cleaner making sure all holes and crevices were clean use a small brush to help
Replace all parts with new parts
Put back together
Started perfectly
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Motor would only run a few seconds then stall
ROBERT - January 4, 2021
Tool Type
Engine
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Wrench Set
Followed instructions that came with parts.
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Very hard to start and ran very rough consuming much more gas than normal
Robert - June 17, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
1-2 hours
Tools Used
Screwdriver, Socket set, Mill file, carburetor cleaner
Parts Used
1. Removed speed control cable from carburetor throttle.
2. Removed carburetor air cleaner.
3. Removed carburetor from engine
4. Disassembled carburetor, cleaned all parts.
5. Assembled carburetor using new pump diaphragm.
6. Tested. Engine ran like new after repair.
Total time 2 hours
2. Removed carburetor air cleaner.
3. Removed carburetor from engine
4. Disassembled carburetor, cleaned all parts.
5. Assembled carburetor using new pump diaphragm.
6. Tested. Engine ran like new after repair.
Total time 2 hours
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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.
