Question about 1986 Honda VT 500 C Shadow

1 Answer

1986 VT 500 C SHADOW fuel line routing

1986 VT 500 C SHADOW FUEL TANK AND PETCOCK LINES? I have 3 line openings (*******?) on the petcock, and one line opening (nipple) underneath, on the bottom of the tank at the front of the bike. Just need help with locations of. ON PETCOCK 1) The Larger nipple is for the fuel line. 2) Smaller one, on side of petcock, pointing down, and located in the front of bike side o the petcock, the line comes off the cylinder and plugs to the nipple which is the vacuum line. 3)The third Petcock nipple (also small nipple) on the back pointing towards bike frame, is where I need help because there are no lines near it to attach it to so my question is where should I run this small line when I get a new one? What does it attach to if anything? East coast bike and no charcoal canister/emissions. 4) Also, the nipple at the front of the tank underneath had a short line that looked like it was broken off, but believe this is just the tank vent line that can be run down through the frame or someplace close? Thanks in advance for your help...

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Honda Master
  • 39,936 Answers

Hi, Spinnuh for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
1986 VT 500 SHADOW fuel line routing Google Search
Air Cut Off Valve Fuel and Vent Hose Connections for 1985 Honda Shadow...

Posted on Jul 14, 2017

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 2336 Answers

SOURCE: fuel petcock

The petcock is what the fuel flows through when it comes out of the gas tank. It probably includes: * A switch with positions for On, Off and Reserve. * A fuel line going to the carburetors. * A vacuum hose attachment which attaches to a carburetor which tugs on a rubber diaphram to let gas flow through. * An overflow/drip valve from the vacuum area. It's located right under the tank on the rear/left side.

Posted on Nov 10, 2008

  • 4565 Answers

SOURCE: my 1998 Dyna has a small leak or drip coming from petcock

Sounds like you have a hole in the vacuum diaphragm that opens and closes the petcock. This is one of the problems with the vacuum operated device. The other problem is that sometimes they don't open and you're left stranded with a full tank of gas and not a drop in the carburetor. I changed to a manual operated petcock. Personally, I'd rather have a Pingle petcock than another vacuum operated Harley petcock. If you do change to a manual operated petcock, don't forget to plug the small vacuum hose.

If you want to keep your vacuum operated device, I think you can buy a replacement diaphragm. You will have to drain the tank and remove the petcock. There are four small screws on the backside. Remove the screws and the backplate will come off. The diaphragm and a sping is all that is in that section of the petcock.

Posted on Apr 01, 2010

  • 1857 Answers

SOURCE: Not sure the vacuum lines may have schematics, The sell parts and usually have a layout of the systems

Posted on Aug 10, 2010

  • 33 Answers


if you dont use the original style you will flood the carbs every time. the vac style on this bike has metered flow for these carbs

Posted on Sep 06, 2010

Testimonial: "Thanks.Was very helpful."

  • 1 Answer

SOURCE: 82 gs 550 two nipples on petcock and one nipple on

is there one bigger then the other on the nipples. If so the one bigger is for the carb fuel and the little one should run down the left carb, betewwn the front of the carb and the carb mount.

Posted on Nov 04, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Fuel line routing diagrams for 86 yamaha fz600

You can route it any way you want really. I'm not familiar with your specific model but if you don't have a fuel filter (you should) or a fuel pump to worry about it's just a matter of finding the easiest path from the inlet nipple from the carburetor rack to the petcock on the tank...

That's an awesome number of innuendos in one sentence!

Aug 26, 2014 | 1986 Yamaha FZ 600

1 Answer

Cant figure out which hoses hook to which valve lines on a 1986 yamaha riva moped scooter fuel petcock

Large line is fuel, from tank to petcock. Large line from petcock to Carb. small line is vacumn from intake manifold to petcock (small spigot). suck on this line & make sure Gas comes through Large line to Carb.

Dec 16, 2013 | 1985 Yamaha XJ 700 X Maxim

2 Answers

Does the Honda 500 shadow have a fuel pump

No this model did not come with a fuel pump. Actually the VT 700 Series was the only Honda from 1986 that contained a fuel pump.

Aug 27, 2011 | 1986 Honda VT 500 C Shadow

2 Answers

I have a vacum line off and a plug missing need to see diogram on CARB AND VACUMS LINES BECUASE NOT GET GAS TO CRAB

If you're not getting fuel to the carb, then the vacuum line you're talking about comes from the backside of your carb and feeds vacuum to both the VOES switch and the vacuum operated petcock. The VOES is either up in the tunnel of the fuel tank or on the choke cable bracket. The nipple for the vacuum line on the petcock is on the backside of the petcock. The nipple for the vacuum line at the carb or intake should be visible is you look at the backside of the carb from the left side of the bike.

Good Luck

Jun 09, 2011 | 2003 Harley Davidson XLH Sportster 883...

1 Answer

Two tubes leave carburator and goes to gas tank. One has come loose and I dont see where it goes

1 tube is a fuel line and 1 tube is a vacuum line

The big one is the gas line which goes to the petcock.

The smaller one is a vacuum line which also goes to the petcock.

That is a vacuum operated petcock, which works off the vacumm off the intake side of the carb.
the intake side is the engine side, the other side of the carb is airbox side.
There should be a nipple sticking out of the carb on top on the intake side.
If not then the nipple is on the intake boot itself, on top.
The intake boots are on the engine side of the carb and the airbox boots are the opposite side.

Nov 29, 2010 | Honda VT 250 F Motorcycles

1 Answer

I have a '94 honda shadow 600 and would like to know how to remove the fuel tank.

Remove the seat and then remove the single bolt that holds the rear of the gas tank down. From that point, slide the tank back and off of the two rubber bushings that the front of the tank is resting on. Disconnect the fuel and vacuum lines from the petcock - then lift the tank from the bike.

Nov 25, 2009 | 1994 Honda VT 600 C Shadow

1 Answer

Need vacumn line routing for the petcock

The other two carburators will connect to each other, then the closest to the petcock attaches to the petcock vacuum. This is the smaller of the two lines off of the carburator. The larger one is where fuel runs into carb, the other operates the vacuum pumps in the carbs to pull fuel. I hope this helps, I repaired this myself, therefore I have no schematic to provide to you. I hope this is helpful

Jul 11, 2009 | 1986 Honda VT 500 C Shadow

1 Answer

Fuel leak where fuel tube goes into carb.

Turn the petcock valve off and the flow should stop. If the fuel line is long enough, cut the broken line just above the break then re-attach to the nipple.

May 21, 2009 | 1977 Suzuki GS 750

1 Answer

Leaking Fuel tap (petcock)

This sounds like a vacuum lock pet ****. 3 position? run, prime,and reserve? If you have it on pri, You will fuel running or not. If set on run, then you will only pass fuel when engine is running, and of course res. when tank is used up. Is this leak at the valve? or from the tank or internally flowing? Tis should also be a gravity feed fuel system, please correct me if I'm wrong. good luck. Long fuel lines are not prefered on gravity feed systems.

May 20, 2009 | 1986 Honda VT 500 C Shadow

2 Answers

Need connection pictures from the carburators to the tank complete service manual download but to make it easier for you.... short line between carbs 1 and 2 goes to the rear facing nipple on petcock. line between carbs 3 and 4 goes to the front facing nipple on the petcock and the vacuum line on the side of carb 4 goes to the nipple on the petcock that is facing away from the fuel knob. the 2 other lines on the carbs are just float bowl overflows that get criss crossed across the carbs and draped down the sides they are only there to keep the gas from flooding your motor if you dump your bike. hope this helps

Apr 29, 2009 | 1988 Suzuki GSX 600 F (Katana)

Not finding what you are looking for?
1986 Honda VT 500 C Shadow Logo

Related Topics:

496 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4514 Answers


Level 3 Expert

75005 Answers

Gino Cussen
Gino Cussen

Level 2 Expert

216 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides