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Repair Parts Home  Lawn Equipment Parts  Ryobi Parts  791-683974B Primer and Hose Assembly

Primer and Hose Assembly

Part Number: 791-683974B
RyobiTroy-BiltYard ManBolensMTDYard Machines
Availability: 25+ in stock
Price: $14.49
Quantity:
Order within the next 13 hours
and your part ships today!

*This part replaces obsolete part #: 791-181801, 791-181558 and 791-683974.

Description:
The primer hose is inserted into the fuel tank then connected to the Primer.
By pressing on the primmer a few times this assembly fills the carburetor with fuel.
When the carburetor has enough fuel in it, the excess fuel is forced back into the the tank through the fuel return line.

After time the primer hose will become brittle and crack and have to be replaced.
The primer will also lose its elasticity, and may also crack and not be able to suck up the fuel into the carburetor.
And will have to be replaced.

Product Information
Manufacturer: Ryobi, Troy-Bilt, Yard Man, Bolens, MTD, Yard Machines
Product Number: 791-683974B
Classification: Part
Weight: 0.01 lbs.
Also Known As: Purge Bulb, Carb Primer, Carburetor Primer, Fuel Primer, Primer Bubble
Shipping: Ships Worldwide
Repair Guides
Articles:
How to Replace a Primer Bulb
Replacing primer bulbs in small engines is one of the most common types of tool repairs, and this article explains profe...
June 25, 2010
How to Replace the Primer and Hose Assembly on a Ryobi Trimmer
Primer past its prime? Remove and install the primer and hose assembly on your Ryobi string trimmer. Simple instructions...
September 08, 2015
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Compatibility

This part is compatible with the following machines:

Ryobi
410r (21A-121R034) Tiller
410r (21AK410G034) Tiller
410r (21BK410G034) Tiller
410r (21CK410G034) Tiller
410r (21DK410G034) Tiller
410r (21EK410G034) Tiller
410r (21FK410G034) Tiller
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320BVR (41AS320G034) Handheld Blower/Vacuum
320BVR (41AS320G034) Handheld Blower/Vacuum
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320BVR (41AS320G734) Handheld Blower/Vacuum
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320BVR (41BS320G734) Handheld Blower/Vacuum
600r (41AN600G034) Handheld Trimmer
600r (41BN600G034) Handheld Trimmer
700r (41AD700G034) Handheld Trimmer
700r (41AD700G734) Handheld Trimmer
700r (41ADL01G034) Handheld Trimmer
700r (41ADL01G734) Handheld Trimmer
700r (41BD700G034) Handheld Trimmer
700r (41BDL01G034) Handheld Trimmer
700r (41CD700G034) Handheld Trimmer
700r (41DD700G034) Handheld Trimmer
700rVP (41AD7VPG034) Handheld Trimmer
700rVP (41AD7VPG734) Handheld Trimmer
700rVP (41CD7VPG034) Handheld Trimmer
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704r (41BD704G034) Handheld Trimmer
704r (VP 41AD7V4G034) Handheld Trimmer
704rVP (41BD7V4G034) Handheld Trimmer
704rVP (41CD704G034) Handheld Trimmer
704rVP (41CD7V4G034) Handheld Trimmer
705r (41AD705G034) Handheld Trimmer
705r (41AD705G734) Handheld Trimmer
705r (41BD705G034) Handheld Trimmer
705r (41BD705G734) Handheld Trimmer
705r (41CD705G034) Handheld Trimmer
720r (41AD720A034) Handheld Trimmer
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725r (41AD725B034) Handheld Trimmer
725r (41AD725C034) Handheld Trimmer
725r (41ADL04A034) Handheld Trimmer
725r (41ADL04A734) Handheld Trimmer
725r (41BD725A034) Handheld Trimmer
725r (41BD725A734) Handheld Trimmer
725r (41BD725B034) Handheld Trimmer
725r (41BD725C034) Handheld Trimmer
725r (41BDL04A034) Handheld Trimmer
725r (41CD725A034) Handheld Trimmer
725r (41CD725B034) Handheld Trimmer
725r (41CD725C034) Handheld Trimmer
725r (41DD725A034) Handheld Trimmer
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725rE (41BD7CRC034) Handheld Trimmer
725rE (41CD2REC034) Handheld Trimmer
725rE (41CD7CRC034) Handheld Trimmer
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750r (41BD750A034) Handheld Trimmer
750r (41BD750E034) Handheld Trimmer
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765r (41AD765G034) Handheld Trimmer
765r (41AD765G734) Handheld Trimmer
765r (41ADL02G034) Handheld Trimmer
765r (41ADL02G734) Handheld Trimmer
765r (41BD765G034) Handheld Trimmer
765r (41BD765G734) Handheld Trimmer
765r (41BDL02G034) Handheld Trimmer
766r (41BD766G034) Handheld Trimmer
766r (41CD766G034) Handheld Trimmer
767r (41BD767G034) Handheld Trimmer
767r (41CD767G034) Handheld Trimmer
767rJ (41DD76JG034) Handheld Trimmer
767rJ (41ED76JG034) Handheld Trimmer
770rEB (41AD7EBC034) Handheld Trimmer
775r (41AD775A034) Handheld Trimmer
775r (41AD775A734) Handheld Trimmer
775r (41AD775B034) Handheld Trimmer
775r (41ADL05A034) Handheld Trimmer
775r (41ADL05A734) Handheld Trimmer
775r (41BD775A034) Handheld Trimmer
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775r (41BD775B034) Handheld Trimmer
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775r (41CD775A034) Handheld Trimmer
775r (41CD775B034) Handheld Trimmer
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775r (41ED775A034) Handheld Trimmer
775r (41FD775A034) Handheld Trimmer
780r (41BD780G034) Handheld Trimmer
780r (41ED780G034) Handheld Trimmer
780r (41FD780G034) Handheld Trimmer
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RGBV3100 (41ASGBPG034) Handheld Blower/Vacuum
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RGBV3100 (41BSGBVG034) Handheld Blower/Vacuum
RGBV3100 (41CSGBVG034) Handheld Blower/Vacuum
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740R 2-Cycle Gas Trimmer
Troy-Bilt

Products Compatibility

This item works with the following types of products:

  • • Blower
  • • Cultivator
  • • Edger
  • • Trimmer
  • • Vacuum
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
35 of 42 people found this instruction helpful
Tool Type:
Cultivator
Parts Used:
Fuel Line and Filter - 791-682039
Primer and Hose Assembly - 791-683974B
Fuel Return Line - 791-181086
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver
Fuel Leak
The fuel line and filter, primer and hose assembly, and the fuel return line had deteriorated over time and were leaking fuel. I found the parts here and ordered them. When the parts arrived, I removed four screws from the rear cover on the engine, pulled off the old hoses and put the new ones on. I screwed the rear cover in place and was done in about 30 minutes or less.
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26 of 28 people found this instruction helpful
Tool Type:
Trimmer
Parts Used:
Primer and Hose Assembly - 791-683974B
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Pliers
Bulb disintegrated because of ethanol in gas. (Use premium gas in small motors )
The priming bulb has disintegrated in this trimmer. Unit came with one gas line, simple swap. Website had great tools to ID the part, match it to model of trimmer. Just mind what hose goes where. Note the replacement hose will need an angle cut to go into the gas tank easier.
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18 of 20 people found this instruction helpful
Tool Type:
Trimmer
Parts Used:
Primer and Hose Assembly - 791-683974B
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, Bristol tip screwdriver , sharp knife, needle nose pliers
The old primer bulb had cracked and the was a hole where the top of the bulb is normally plugged shut in the mfg mold. Couldn't prime the carburetor.
1,removed the muffler and air filter housing four mount screws with the screwdriver
2,removed the center fuel tube leads from carburetor to the primer bulb outer connecting tube (make sure the fuel tank is empty of any fuel)
3,remove only the tube leading from the outer primer bulb connection to the inner hole in the fuel tank.
4,unsnap the old primer bulb from the mount by squeezing the lock arms and pull the bulb assembly rearward.
Install the new tube to the longer outer connection port. Then cut a 45 degree angle on the loose end of the tube.
2,install the new primer bulb and tube into the mount bracket *you may have to squeeze the mount locks inward slightly bending them towards each other to get them in through the mount bracket hole. They fit tight.
3,put a drop of oil on the 45 degree end of the tube. Using needle nose pliers force the 45°end through the inner hole of the fuel tank. Look through the fuel cap opening of the tank to be sure all the 45°end is inside the tank.
Reinstall the muffler and air filter housing. Fuel up and go.
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5 of 5 people found this instruction helpful
Tool Type:
Cultivator
Parts Used:
Primer and Hose Assembly - 791-683974B
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Pliers, Nutdriver
Primer bulb split , unable to prime engine to start
Removed old primer bulb and hose and replace with new primer bulb and hose, started up just fine. Ryobi gas engine , with extensions.
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5 of 6 people found this instruction helpful
Tool Type:
Cultivator
Parts Used:
Primer and Hose Assembly - 791-683974B
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver, Pliers
Bad primer bulb
No instructions were included with the replacement part so I watched ereplacementparts video on youtube. This made repair really easy.

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3 of 3 people found this instruction helpful
Tool Type:
Trimmer
Parts Used:
Primer and Hose Assembly - 791-683974B
Fuel Return Line - 791-181086
Primer and Line Assembly - 791-181538
Fuel Line Assembly W/Filter - 791-181085
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers
Trimmer hadn't been started in 8 yrs. Fuel lines and carburetor were deteriorated.
Removed carburetor and cleaned all internal parts. replaced all full lines, primer bulb and gas filter. Replaced spark plug. Started on 2nd pull and runs like a champ.
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4 of 5 people found this instruction helpful
Tool Type:
Trimmer
Parts Used:
Primer and Hose Assembly - 791-683974B
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, Needle nose pliers
The primer bulb fell apart on my machine
Since it was half apart the replacement was simple:
1. I used the pliers to pull the fuel lines off the bulb.
2. Squeezed the tabs in to release the bulb.
3. Inserted new bulb until it snapped in.
4. Slid fuel lines on.
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3 of 4 people found this instruction helpful
Tool Type:
Cultivator
Parts Used:
Fuel Line and Filter - 791-682039
Primer and Hose Assembly - 791-683974B
Fuel Return Line - 791-181086
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers
Hoses were brittle and primer was cracked
Remove cover, loosen carburetor, pull up to get gas tank out, put new hoses in, ran from gas tank to carburetor. Needed 3 new hoses and primer, reconnected them, snapped new primer in place and put back together.
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2 of 3 people found this instruction helpful
Tool Type:
Trimmer
Parts Used:
Fuel Line and Filter - 791-682039
Primer and Hose Assembly - 791-683974B
Fuel Return Line - 791-181086
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Pliers
Fuel lines were old, cracked, brittle and disconnected
Replaced each fuel line one at a time. Very easy except for the fuel tank line that had the filter already installed. Needed to go from inside the tank and then push it in place from the inside. An "L" shaped tool helped. Otherwise very easy and did not need to purchase a new trimmer.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Cultivator
Parts Used:
Fuel Line and Filter - 791-682039
Primer and Hose Assembly - 791-683974B
Fuel Return Line - 791-181086
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Socket set, Nutdriver
Fuel hoses were fell apart.
1. Removed cover over carburetor, four screws.
2. Removed carburetor, two screws.
3.Inserted hoses and primer. Used sockets and a nut driver to get filter and fuel line into tank. This was the innovative part if the installation.
4 .Reassembled carburetor and cover.
5. Gassed it up and it ran..
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Discussion
Discussion for Primer and Hose Assembly - ( 791-683974B )
Discussion is closed. To ask our experts a question about a part, use the Q&A feature.
Question: Hose

BrownH

Rephrased: Can you tell me how much "hose" comes with this assembly?
WJA
Hello BrownH,

The Ryobi 791-683974B hose length is 4-1/2 inches.

-WJA
Question: Ryobi 720R Gas Trimmer

1213840

What are the correct parts for:
the primer assembly plus bulb,
hoses from fuel filter to carb,
fuel tank to primer,
primer to carb?
Question: Ryobi 790r Trimmer S/n 4031UB24R...

Russel

What is the correct primer bulb hose assembly and fuel line assembly for the above mentioned trimmer?
WJA
Hello Russel,

I could not locate a 790R with that type of serial number on any of the parts diagrams that we have on that model. But all of the 790R part diagrams do show that they all use the 791-683974B primer and hose assembly. You should be okay using it for your trimmer.

-WJA
Question: 410r EZ 13A6987 Ryobi Tiller

RoyW

I have a 1997 Ryobi 31cc tiller
707-2940160
sn 707112369
ppn: 501148
I need a replacement Primer bulb
will this one fit?
Roy
WJA
Hello RoyW,

With the information you provided. The part number 791-683974B primer and hose assembly is the correct part.

-WJA
Question: 775R

JEI

I have an old 775R that I believe was built in 1997 that I just pulled from storage. I can not locate the reference #s you list (41xxxxxxxxxx) next to the model.
I need to replace all of the fuel lines and primer as they have disintegrated. Also the air filter. The part # match from my manual - as being obsolete replacements.
I just want to make sure I get the proper parts and not have to go back and forth. Thanks!
Question: Fuel Line Uses?

thedodgeguy67

Will this line work for the return line and the intake line from the tank and the primer to carburetor line? Or are the three of them all different sizes? I am repairing a Ryobi 775r string trimmer.
WJA
Hello thedodgeguy67,

As I remember the line are different sizes. So to make sure you get the correct ones, they are 791-683974B Primer and Hose Assembly, and 791-682039 Fuel Line Assembly.

-WJA
Question: 720r Primer Bulb

gwd54

I need to replace the primer tubes on my trimmer, and to verify the hookup to the primer bulb: the bulb should suck fuel though the carb and push it into the tank, correct? I have a starting/idle problem, and I think it is from the air leak at the primer tubes.

Thanks.
UtahAV
You are correct. The fuel should be pulled through the carb and then back into the tank. We have an article and video that shows how to determine the proper routing. You can find it at the following link...

Fuel line Routing for 2-Cycle Engines

I hope this helps,

-UtahAV
-Mark
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