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Diaphragm-Carburetor

Part Number: 391681
Briggs and StrattonToro
Availability: 6 in stock
Price: $22.26
Order within the next 6 hours
and your part ships today!

*This part replaces obsolete part #: 391643.

Product Information
Manufacturer: Briggs and Stratton, Toro
Product Number: 391681
Classification: Part
Weight: 0.03 lbs.
Shipping: Ships Worldwide
Description:
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
Frequently Purchased With
Compatibility

This part is compatible with the following machines:

Briggs and Stratton
Toro
10502 (1000001-1999999)(1981) Lawn Mower
16009 (7000001-7999999)(1977) Lawn Mower
16009 (8000001-8999999)(1978) Lawn Mower
16009 (9000001-9999999)(1979) Lawn Mower
16035 (7000001-7999999)(1977) Lawn Mower
16067 (7000001-7999999)(1977) Lawn Mower
16067 (8000001-8999999)(1978) Lawn Mower
16067 (9000001-9999999)(1979) Lawn Mower
16073 (6000001-6999999)(1976) Lawn Mower
16106 (7000001-7999999)(1977) Lawn Mower
16113 (7000001-7999999)(1977) Lawn Mower
16113 (8000001-8999999)(1978) Lawn Mower
16113 (9000001-9999999)(1979) Lawn Mower
16155 (7000001-7999999)(1977) Lawn Mower
16155 (8000001-8999999)(1978) Lawn Mower
16155 (9000001-9999999)(1979) Lawn Mower
16169 (5000001-5999999)(1975) Lawn Mower
16169 (6000001-6999999)(1976) Lawn Mower
16173 (6000001-6999999)(1976) Lawn Mower
16240 (5000001-5999999)(1975) Lawn Mower
16264 (7000001-7999999)(1977) Lawn Mower
16273 (6000001-6999999)(1976) Lawn Mower
16277 (7000001-7999999)(1977) Lawn Mower
16277 (8000001-8999999)(1978) Lawn Mower
16277 (9000001-9999999)(1979) Lawn Mower
16287 (7000001-7999999)(1977) Lawn Mower
16287 (8000001-8999999)(1978) Lawn Mower
16287 (9000001-9999999)(1979) Lawn Mower
16300 (9000001-9999999)(1979) Lawn Mower
16300 (0000001-0999999)(1980) Lawn Mower
16300 (1000001-1999999)(1981) Lawn Mower
16310 (9000001-9999999)(1979) Lawn Mower
16310 (0000001-0999999)(1980) Lawn Mower
16310 (1000001-1999999)(1981) Lawn Mower
16310 (2000001-2999999)(1982) Lawn Mower
16320 (9000001-9999999)(1979) Lawn Mower
16320 (0000001-0999999)(1980) Lawn Mower
16320 (1000001-1999999)(1981) Lawn Mower
16320 (2000001-2999999)(1982) Lawn Mower
16325 (3000001-3999999)(1983) Lawn Mower
16330 (3000001-3999999)(1983) Lawn Mower
16330 (4000001-4999999)(1984) Lawn Mower
16330 (5000001-5999999)(1985) Lawn Mower
16360 (9000001-9999999)(1979) Lawn Mower
16370 (9000001-9999999)(1979) Lawn Mower
16550 (8000001-8999999)(1978) Lawn Mower
16600 (7000001-7999999)(1977) Lawn Mower
16600 (8000001-8999999)(1978) Lawn Mower
16655 (7000001-7999999)(1977) Lawn Mower
16655 (8000001-8999999)(1978) Lawn Mower
16711 (7000001-7999999)(1977) Lawn Mower
16711 (8000001-8999999)(1978) Lawn Mower
16756 (7000001-7999999)(1977) Lawn Mower
16756 (8000001-8999999)(1978) Lawn Mower
16800 (9000001-9999999)(1979) Lawn Mower
16810 (9000001-9999999)(1979) Lawn Mower
16820 (9000001-9999999)(1979) Lawn Mower
16830 (9000001-9999999)(1979) Lawn Mower
16860 (0000001-0999999)(1980) Lawn Mower
16860 (1000001-1999999)(1981) Lawn Mower
16870 (0000001-0999999)(1980) Lawn Mower
16870 (1000001-1999999)(1981) Lawn Mower
16870 (2000001-2999999)(1982) Lawn Mower
16880 (0000001-0999999)(1980) Lawn Mower
16880 (1000001-1999999)(1981) Lawn Mower
16880 (2000001-2999999)(1982) Lawn Mower
16890 (0000001-0999999)(1980) Lawn Mower
16890 (1000001-1999999)(1981) Lawn Mower
16890 (2000001-2999999)(1982) Lawn Mower
16930 (0000001-0999999)(1980) Lawn Mower
16940 (0000001-0999999)(1980) Lawn Mower
20560 (3000001-3999999)(1983) Lawn Mower
20735 (9000001-9999999)(1979) Lawn Mower
20735 (0000001-0999999)(1980) Lawn Mower
20742 (4000001-4999999)(1984) Lawn Mower
20742C (5000001-5999999)(1985) Lawn Mower
20743C (5000001-5999999)(1985) Lawn Mower
20750 (8000001-8999999)(1978) Lawn Mower
20752 (2000001-2999999)(1982) Lawn Mower
20755 (9000001-9999999)(1979) Lawn Mower
20755 (0000001-0999999)(1980) Lawn Mower
20755 (1000001-1999999)(1981) Lawn Mower
20755 (2000001-2999999)(1982) Lawn Mower
20725 (9000001-9999999)(1979) Lawn Mower
20661 (3000001-3999999)(1983) Lawn Mower
20698 (8000001-8999999)(1978) Lawn Mower
20698 (9000001-9999999)(1979) Lawn Mower
20698 (0000001-0999999)(1980) Lawn Mower
20698 (1000001-1999999)(1981) Lawn Mower
20698 (2000001-2999999)(1982) Lawn Mower
20798 (9000001-9999999)(1979) Lawn Mower
20798 (0000001-0999999)(1980) Lawn Mower
20765 (0000001-0999999)(1980) Lawn Mower
20765 (1000001-1999999)(1981) Lawn Mower
20785 (9000001-9999999)(1979) Lawn Mower
20785 (0000001-0999999)(1980) Lawn Mower
20785 (1000001-1999999)(1981) Lawn Mower
20785 (2000001-2999999)(1982) Lawn Mower
23307 (7000001-7999999)(1977) Lawn Mower
23307 (8000001-8999999)(1978) Lawn Mower
23333 (7000001-7999999)(1977) Lawn Mower
23333 (8000001-8999999)(1978) Lawn Mower
23400 (0000001-0999999)(1980) Lawn Mower
23400 (1000001-1999999)(1981) Lawn Mower
23400 (2000001-2999999)(1982) Lawn Mower
23450 (0000001-0999999)(1980) Lawn Mower
23450 (1000001-1999999)(1981) Lawn Mower
Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Engine
  • • Generator
  • • Lawn Mower
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
4 of 4 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Breather Tube Grommet - 692189
Spring-Pump Diaphragm - 692206
Diaphragm-Carburetor - 391681
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Socket set
Very bad engine misfire, could not be corrected with needle valve adjustment or carb cleaning
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!
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2 of 2 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Cap-Fuel Tank - 493982S
Diaphragm-Carburetor - 391681
Element-Air Cleaner - 270579S
Spark Plug - 796112S
Repair Difficulty:
Easy
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Wrench Set, Nutdriver
Lawn Mower wouldn't start
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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2 of 2 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Spring-Pump Diaphragm - 692206
Needle-Valve Kit - 395508
Diaphragm-Carburetor - 391681
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Socket set
The engine was hard starting and the RPM’s surging up and down.
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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Tool Type:
Lawn Mower
Parts Used:
Tube-Pick Up - 297219S
Tube-Pick Up - 497413S
Needle-Valve Kit - 395508
Diaphragm-Carburetor - 391681
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers, Socket set, Nutdriver, Adjustable Wrench
Was not getting gas to the carburetor
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
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Tool Type:
Engine
Parts Used:
Seal-O Ring - 270344S
Cap-Spring - 690766
Spring-Pump Diaphragm - 692206
Diaphragm-Carburetor - 391681
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Wrench Set
Motor would only run a few seconds then stall
Followed instructions that came with parts.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Diaphragm-Carburetor - 391681
Repair Difficulty:
Easy
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Mill file, carburetor cleaner
Very hard to start and ran very rough consuming much more gas than normal
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
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Thanks for voting and helping fellow customers!
Reviews
4.5
Average Rating (out of 5):
2 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
    Verified Purchase
    eReplacementParts Team
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    Product Information
    Manufacturer: Briggs and Stratton, Toro
    Product Number: 391681
    Classification: Part
    Weight: 0.03 lbs.
    Shipping: Ships Worldwide

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