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What is this hose?


blkbrdrydr

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After owning my Blackbird for 11 years and for all the times that I've had the tank off you'd think that I'd know the answer to this question but... I'm not certain.

I noticed that this brown hose was not connected to anything and I'm not certain if it's a breather hose or what.

I think that it's one of two hoses that connect to the Wax Unit and according to the hose routing diagrams in the Service Manual, it appears as if this doesn't connect to anything but, can someone confirm that it's a breather hose?

It's the brown colored hose that's running through the black side of the black and white hose clip.

Thanks,

IMG_1602.jpg

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That hose is the upper vent (vacuum break) end of the vent/drain hose for the fuel tank vent. If you follow it down, you will see that it goes to a "T" connecting to a hose that runs to the right side of the frame then back to the left to the fuel tank vent nipple (not to be confused with the filler neck overflow tube and nipple, which is a larger hose). The rest of the hose from the lower third of the "T" continues down the left side near the clutch slave cylinder to allow any over-flow liquid fuel from the tank to drain safely to the ground.

The upper vent end should not be connected to anything, but is held in place by the white/black double hose clip.

If you look very closely, it is shown in many of the under-tank drawings in the shop manual, although the part past the retaining clip always appears shorter than the actual installed hose.

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That hose is the upper vent (vacuum break) end of the vent/drain hose for the fuel tank vent. If you follow it down, you will see that it goes to a "T" connecting to a hose that runs to the right side of the frame then back to the left to the fuel tank vent nipple (not to be confused with the filler neck overflow tube and nipple, which is a larger hose). The rest of the hose from the lower third of the "T" continues down the left side near the clutch slave cylinder to allow any over-flow liquid fuel from the tank to drain safely to the ground.

The upper vent end should not be connected to anything, but is held in place by the white/black double hose clip.

If you look very closely, it is shown in many of the under-tank drawings in the shop manual, although the part past the retaining clip always appears shorter than the actual installed hose.

Thanks for the answer and detailed explanation.

I looked at all of the drawings in the shop manual and felt that this was probably a breather hose but wasn't able to find where the other end was.

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  • 3 years later...

Hey all, I think I found this hose, but can't see the pictures.. After I changed my air filter, and put the tank back down, about 5 minutes later, there a pool of gas surrounding the bird. My hose is about 5/8 od x 3/8 id. There is a metal connection in the base of the tank, located to the LEFT of the fuel pump. This connection is a welded fitment of the tank. It is not part of the fuel pump.

I think it is a the breather tube that was described above. Any chance somebody can direct me to the proper location of the white/ black clip the end is supposed to be attached to? Thank you in advance.

Also it might be worth noting that when you touch your gas tank and return it to its proper position stay with it for a bit..... is this the feeling like an idiot emoji?

And in a pinch, when your landlady is on the way home and you have a gas leak on her patio..... Sphagnum peat moss performs remarkably well for cleanup due to its impressive absorbent properties, with a little simple green to mask the gas odor. Tomorrow while she is at work, I shall be power washing the patio.

Edited to change rear to LEFT

Edited by MWL_XX
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Ok, picture attached.

Silver hexagonal fuel rail is on the left, fuel line curves down to the right and up to the left connecting to the brass fuel pump.

The hose I am questioning is black and resting against the fuel line and enters the tank just in front of the smaller diameter grayish overflow tube.

A bit of backstory.... I couldn't safely get on bike for many years (my right jaw and right ear were fucked up from Ear drum tube scarring and TMJ inflammation from trauma from a fall as a child.) anywho, I am now feeling better and want to ride again.

I was changing the air filter, and when I returned the gas tank to its normal position and filled the tank, gas started pissing out of this hose. I pulled the tank back and saw this hose where it connects to the nipple was split. I spun the hose and inserted the unsplit end and then placed a bolt and wrapped a rubber band around it it stop it. I then went and bought a new 18" length of fuel line hose and replaced it.

Full charged a new battery and same issue again. The bike won't ' stay running, starter fluid works, but will not run. The bolt and rubber band were removed from the breather tube while trying to start and eventually, I got close to having it run on its own, but it dies, and then the hose started pissing gas again.......

A Maybe a fubar fuel pump?

B Maybe I put gas in the breather line by tilting the tank back towards the seat instead of forward?

C I should stick to riding the 94 GT Rebound?

D Definitley hookers?

Thanks in advance.

Mike

post-3288-0-55606900-1435071973_thumb.jp

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Maybe it's me, but I think you put the hose on the wrong nipple. There's on on the "brass" colored bit in the background. THAT gets a hose (IIRC) and the black one on the tank goes without one. Don't ask me why it's that way.

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Thanks for the quick reply. The hose in question was split BUT still attached. The smaller overflow hose was in good condition and in place.

I did a search of youtube and found Iain Arthurs video of a startup procedure. His video is titled Honda Blackbird 2002.

When he turns the ignition on, there is a whirring noise that continues until the lights on the dash go out. I assume this is the fuel pump pressurizing. My XX only makes 3 or 4 clicks.....with no whirring. I checked the fuse box and I have checked all the wires as best as I can visually. I think my fuel pump or fuel pressure regulator is fucked....

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