Easy
Less than 15 minutes
This replacement part is a genuine high quality OEM primer bulb. It is specially produced for use on gas powered string trimmers. The purpose of the primer bulb is to force fuel from the fuel tank into the carburetor. Once the carburetor is full of fuel, the excess fuel will be sent back into the tank. Over time these flexible rubber parts tend to deteriorate and lose their elasticity. If the part is cracked it will need to be replaced. Please note, one primer bulb is included per order.
Bulb-primer 791-181701
OEM part for: Ryobi, Troy-Bilt, MTD
Part Number: 791-181701
$13.88
In Stock
Ships within 1 business day 
Product Description ?
- Outer Dia: 0.618" (15.70 mm)
- Outer Dia w/flange: 0.718" (18.25 mm)
- Height: 0.563" (14.31 mm)
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
Compatibility
This Bulb-primer will fit the following 10 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 10 of 10 matching models.
Ryobi
Troy-Bilt
MTD
10 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- MTD
- Ryobi
- Troy-Bilt
This item works with the following types of products:
- Trimmer
Repair Videos ?
Articles:
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Replacing primer bulbs in small engines is one of the most common types of tool repairs, and this article explains profe...
June 25, 2010
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Customer Part Reviews ?
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excellent help
item was correct and arrived promptly, no other firm was able to help me identify the part i needed, including the actual part manufactura
Guest -
June 11, 2019
Verified Purchase
Quick easy fix
Gas trimmer is 20 years old and replacement parts are hard to find. Ereplacement had the part I needed and provided quick delivery. Without the part I was faced with purchasing a new trimmer at a cost of $300 for a comparable unit. Saved the day as well as my wallet
Guest -
April 27, 2019
Verified Purchase
Fail
I called and explained what i needed and how my priming bulb was designed. My model(2 yrs old) was not supported in your system. The rep found a part and said it should work. Its not even close. 13 dollars wasted!
Guest -
April 23, 2020
Verified Purchase
Questions & Answers ?
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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.
Removed the old gas bulb
Richard - September 23, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed the primmer bulb cover and removed the old bulb, installed the new one in the cover and screwed it back on.
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The original primer bulb had split and would not prime the trimmer
Mark - October 10, 2019
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Remove the 4 bolts holding the plate the bulb comes through using a Phillips head screwdriver.
Remove plate and bulb, leaving the main assembly on the carb/motor.
Remove the bulb from the plate, then insert the new bulb through the opening on plate.
Seat plate on carb with bulb in grooves and insert the 4 bolts, tighten sequentially in a pattern until tight.
Test primer bulb by priming the system.
If bulb is not seated it will not create a suction, loosen bolts and reseat the bulb and plate then tighten again and repeat test.
Remove plate and bulb, leaving the main assembly on the carb/motor.
Remove the bulb from the plate, then insert the new bulb through the opening on plate.
Seat plate on carb with bulb in grooves and insert the 4 bolts, tighten sequentially in a pattern until tight.
Test primer bulb by priming the system.
If bulb is not seated it will not create a suction, loosen bolts and reseat the bulb and plate then tighten again and repeat test.
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Primer Bulb was leaking.
Gerald - October 11, 2018
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed Carb cover, just snapped off.
Remove four screws.
Pull metal retaining cover off with primer bulb.
Remove primer bulb. Push new bulb in.
Install four screws.
Remove four screws.
Pull metal retaining cover off with primer bulb.
Remove primer bulb. Push new bulb in.
Install four screws.
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Primer bulb at crack in it. And trimmer head was broken entirely.
D - November 9, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Adjustable Wrench
Removed four screws holding primer bulb in. Caution watch for gas seepage. Put new Bulb in place and reinstalled screws.
Removed trimmer head with adjustable wrench and a big pair of channel locks it just screws off and the new one screws right on works perfect.
Removed trimmer head with adjustable wrench and a big pair of channel locks it just screws off and the new one screws right on works perfect.
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Leaky fuel bulb and dirty filter
Arthur - August 6, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed the screws from the primer bulb plate, and removed the cracked primer bulb and installed the new one. Screwed on the plate with the new bulb in it.
Remove the air filter cover and removed the old filter and placed the new filter in, replaced the filter cover
Remove the air filter cover and removed the old filter and placed the new filter in, replaced the filter cover
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Couldn't prime.
Mark - July 12, 2016
👍 1 of 3 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed the screws from the primer cover and removed the old primer. Installed the new primer and tightened the screws.
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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.
