Part Location Diagram of 791-181086 MTD Line, Fuel Return
See part A-19 in the diagram
Replacing your MTD Trimmer Line, Fuel Return
( Grid squares measure 1x1 inch )

Line, Fuel Return 791-181086

Manufactured by:
MTD
ERP Number:
ERP9137685
Part Number:
791-181086
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

A Bit Difficult 

30 - 60 mins 

(61 rated repairs) ?

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Product Description

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This fuel line is an original part from Craftsman for trimmers, blowers, edgers and cultivators. This part is supplying gas, starting with the tank to the carburetor. You will need a screw driver, pliers, a hose pulling wire and cutters to replace this part. This fuel line is made of rubber and sold individually.

Troubleshooting

This part fixes the following symptoms:
  • Will Not Start
This part works with the following brands:
  • MTD
  • Ryobi
  • Craftsman
  • Troy-Bilt
  • Bolens
  • Yard Man
  • Yard Machines
This part works with the following products:
  • Trimmer
  • Leaf Blower / Vacuum
  • Tiller
  • Cultivator
Part# 791-181086 replaces these:
791-180243, 791-181086, 791-181168, 791-182495,

Videos For installing this part.

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Replacing your Line, Fuel Return

Customer Part Reviews

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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.

A Bit Difficult 

30 - 60 mins 

(61 rated repairs) ?
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Fuel Leak

Chris from Salinas, California

48 of 48 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
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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The return hose was brittle and fell apart , and the fuel line was ready to start leaking as well

albert from saint louis, Missouri

27 of 27 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Pliers
Parts Used:
791-181086, 791-682039
On the return line I used a very thin to slip inside the hose so I could guide it to the hole in the gas tank, worked very well, it was long enough to remove from the opening in the top of the tank , the fuel line was a little trickier because the filter needs to go in from the top of the tank , and the nipple has to be forced through the opening in the bottom of the tank, I used a piece of flat iron that was narrow enough to fit through the tank top opening, I bent the end of it so it would fit over the top of the filter , about a 45 degree angle, and was able to push it in place , then put the fuel line on and the lock ring , and then pushed the other end on the nipple to the bulb, make sure the return line isn\'t in to far in the tank or the motor wont run
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Fuel lines had lots of cracks and was leaking badly/tank had a crack in it also

Terry from Cornelius, Oregon

15 of 15 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Parts Used:
753-04307, 791-181086
I just followed the video on youtube.com on how to replace the fuel lines . I would also suggest to replace the primer bulb at the same time
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Hoses were brittle and primer was cracked

Brandon from Spokane, Washington

12 of 12 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
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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The primer bulb was degraded and leaking gas. The primer hose to the carburetor was degraded and broken. Other hoses were degraded and brittle.

Alan from Rio Rancho, New Mexico

10 of 10 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers
1. Remove all the torx screws holding the outside covers in place. Remove the left cover.
2. Remove the old primer bulb assembly from the right cover. Disconnect old fuel lines as required.
3. Draw or take a picture of the throttle control trigger in the right cover, then remove it and the cable from the cover.
4. Remo ve the throttle cable from the right cover and set it to the side. It won\'t go far because the kill switch is still attached.
5. Removed the gas tank and all old/broken hoses/parts.
6. Installed the fuel line in the bottom of the tank. (This requires pulling the filter hose connection through the small hole in the bottom of the tank from the inside. Do not use pliers. Just feed the end of the hose through the hole and apply a steady pull to the hose and wiggle it around. The piece will pull through without breaking anything.)
7. Install the new return fuel line (mine was blue) on the primer bulb assembly.
8. Cut a bevel on the other end to make it easy to feed it into the side hole on the gas tank. This hose was a little long, so I had to cut about an inch off to make it fit correctly.
9. Install the fuel line (bottom of gas tank) to the connection on the cylinder side of the carburetor. This requires good light and long needle nose pliers, unless you want to remove the air filter. (this also removes the carburetor.)
10. Install the primer bulb in the right side cover with the short (clear) fuel line to the front.
11. Connect the front line (clear) to the fitting on the intake side of the carburetor.
12. Push the rear line (blue return line) into the hole in the side of the gas tank.
13. Re-install the throttle cable and trigger assembly to the right cover.
14. With the right cover in place, but not screwed down, and without replacing the left cover, add fuel to the gas tank and check for leaks.
15. Press the primer bulb several times to be sure it is operating properly and there are still no leaks.
16. If all is good, replace the left cover and install all the mounting screws.

Note: I had not used my blower for about 5 years, so I had to do the fuel/air mix setup found in the manual and replace the spark plug. Runs like a dream and no gas leaks.
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No fuel getting to the motor; rotted fuel return line.

Chris from Roseville, California

5 of 5 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
1- 2 hours
Tools:
Screw drivers
Parts Used:
791-181086, 791-682039
Ryobi edger, around 15 years old. Replacing the fuel return line was fairly simple; lots of on-line youtube videos. Knowing the return line was rotted, I expected the fuel line was bad as well, so I went ahead and ordered it. Good thing as it disintegrated as I was replacing the return line. Getting the replacement line through the fuel t ank with the new filter was a lesson in patience. What I wasn\'t prepared for was the 3d fuel line, from primer to the engine. Most of that line was hidden beneath the cowl cover so I wasn\'t expecting it. Sure enough, when I finished replacing the first two, the primer line broke off. I did not have a replacement line, but, I had enough of the old fuel line to shave it down and use it as a temp fix. I know I need to replace that line and probably the plastic primer button. Lesson learned...when one line rots, plan on replacing the entire set up.
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Trimmer hadn\'t been started in 8 yrs. Fuel lines and carburetor were deteriorated.

Paul from Gaithersburg, Maryland

5 of 5 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers
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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Unit had sat idle for several years

Roger from AUGUSTA, West Virginia

4 of 4 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Nutdriver, Pliers, Screw drivers
Replaced all fuel lines, fuel filter and all gaskets and diaphragms in carburetor. Filled with fresh fuel and turned over on 6th pull.
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Fuel lines rotten

Tim from Rio Linda, California

4 of 4 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
1. Remove engine cover
2. Remove old lines
3. Install new lines
4. Replace air filter
5. Replace engine cover
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Would not start

Mike from Rockledge, Pennsylvania

4 of 4 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
Used the videos on your website. Never did this before. Easy- peasy. Thanks for the help and parts.
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Model Cross Reference

This part works with the following models:
ERP Number: ERP9137685
Manufacturer Part Number: 791-181086
Brand Model Number Description
Yard Man 121R Tiller - (21A-900) Tiller
Yard Man 122R Tiller - (21AB901) Tiller
MTD 21A-120R000 Tiller - Tiller
MTD 21A-121R034 Tiller - MTD Tiller Model 21A-121R034 (21A121R034, 21A 121R034) Parts
Yard Machines 21A-121R129 Tiller - Yard Machines Tiller Model 21A-121R129 (21A121R129, 21A 121R129) Parts
MTD 21A-121R700 Tiller - MTD Tiller Model 21A-121R700 (21A121R700, 21A 121R700) Parts
MTD 21A-121R900 Tiller - MTD Tiller Model 21A-121R900 (21A121R900, 21A 121R900) Parts
MTD 21A-121R965 Tiller - MTD Tiller Model 21A-121R965 (21A121R965, 21A 121R965) Parts
MTD 21AB122R901 Tiller - MTD Tiller Model 21AB122R901 Parts
MTD 21AK410G034 Tiller - MTD Tiller Model 21AK410G034 Parts
MTD 21AK410G163 Tiller - MTD Tiller Model 21AK410G163 Parts
MTD 21AS122R799 Tiller - MTD Tiller Model 21AS122R799 Parts
MTD 21B-120R000 Tiller - MTD Tiller Model 21B-120R000 (21B120R000, 21B 120R000) Parts
MTD 21B-121R765 Tiller - MTD Tiller Model 21B-121R765 (21B121R765, 21B 121R765) Parts
MTD 21BK410G034 Tiller - MTD Tiller Model 21BK410G034 Parts
MTD 21BK410G163 Tiller - MTD Tiller Model 21BK410G163 Parts
MTD 21BS122R799 Tiller - MTD Tiller Model 21BS122R799 Parts
MTD 21C-120R000 Tiller - MTD Tiller Model 21C-120R000 (21C120R000, 21C 120R000) Parts
MTD 21CK410G034 Tiller - MTD Tiller Model 21CK410G034 Parts
MTD 21CS122R799 Tiller - MTD Tiller Model 21CS122R799 Parts
MTD 21DK410G034 Tiller - MTD Tiller Model 21DK410G034 Parts
MTD 21DS122R799 Tiller - MTD Tiller Model 21DS122R799 Parts
MTD 21EK410G034 Tiller - MTD Tiller Model 21EK410G034 Parts
MTD 21FK410G034 Tiller - MTD Tiller Model 21FK410G034 Parts
Craftsman 247292560 Cultivator - Cultivator
Ryobi 2800M Trimmer - Trimmer
Ryobi 2800R Trimmer - Trimmer
MTD 2800m Trimmer - 41BD280G700 Gas String Trimmer
Ryobi 280r Leaf Blower / Vacuum - Handheld Blower
Craftsman 29256 Cultivator - Cultivator