Author Topic: Fuel hose size??  (Read 12740 times)

0 Members and 1 Guest are viewing this topic.

Offline dgilling

  • Hot Shot
  • ***
  • Posts: 343
Fuel hose size??
« on: May 19, 2015, 09:42:06 PM »
I tried to search the forum for the answer but came up short. What is the actual fuel hose size you guys are using? I got a 1/4 in hose that seems to fit but Hondaman said it would probably leak. He gave me some 5mm hose (I think that's what he said) and said it was stock. That hose was so crazy tight I could barely get it on but I did.  Then when I tried to pull it off the petcock I had to pull with all my might and it broke the petcock off.

Anyone else using 1/4 in? Seems like that is what all the online places sell.

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,408
  • Central Texas Shop Manual Advocate
Re: Fuel hose size??
« Reply #1 on: May 19, 2015, 10:10:59 PM »
OEM hose is 5.5mm. It's a tight fit for sure.
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: Fuel hose size??
« Reply #2 on: May 19, 2015, 10:11:22 PM »
5.5mm I believe is correct size

Edit:^^beat me to it  ;D

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 14,786
  • Northern Virginia
Re: Fuel hose size??
« Reply #3 on: May 20, 2015, 04:08:52 AM »
I buy Tygon line  ID 3/16" OD 5/16" on eebay or at local power equipment store and it goes easy on and easy off and never leaks.

Like this one:

http://www.ebay.com/itm/5-Ft-Tygon-Clear-Yellow-Fuel-Line-ID-3-16-OD-5-16-/230942030772?pt=LH_DefaultDomain_0&hash=item35c537bbb4

Offline mystic_1

  • Really Old Timer ...
  • *******
  • Posts: 6,071
  • 1970 CB750K
Re: Fuel hose size??
« Reply #4 on: May 20, 2015, 05:00:12 AM »
The trick to rubber lines is to not just pull on them, that just causes them to grip down harder on the thing you're trying to remove them from.  Instead push from the ends so that the hose expands from the pressure instead of stretching and contracting.

Just like a "Chinese finger trap".



mystic_1
"A ship in harbor is safe, but that is not what ships are built for."
- John Augustus Shedd

My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,009
  • I refuse...
Re: Fuel hose size??
« Reply #5 on: May 20, 2015, 05:03:43 AM »
How on earth do you type a post with your fingers trussed up like that? Astonished!  ;)
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline evanphi

  • Apparently I'm an
  • Old Timer
  • ******
  • Posts: 3,107
  • Rhonda the Basket Case
Re: Fuel hose size??
« Reply #6 on: May 20, 2015, 05:37:46 AM »
How on earth do you type a post with your fingers trussed up like that? Astonished!  ;)

--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline BobbyR

  • Really Old Timer ...
  • *******
  • Posts: 12,367
  • Proud Owner of the Babe Thread & Dirty Old Man
Re: Fuel hose size??
« Reply #7 on: May 20, 2015, 05:57:11 AM »
I buy Tygon line  ID 3/16" OD 5/16" on eebay or at local power equipment store and it goes easy on and easy off and never leaks.

Like this one:

http://www.ebay.com/itm/5-Ft-Tygon-Clear-Yellow-Fuel-Line-ID-3-16-OD-5-16-/230942030772?pt=LH_DefaultDomain_0&hash=item35c537bbb4

That stuff is great. Thin and flexible, easy to route without kinking, and self clamping.
Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,528
  • Bike almost back to the 70's 2015
Re: Fuel hose size??
« Reply #8 on: May 20, 2015, 06:46:41 AM »
I use USA made Gates Barricade  6mm ID, 13mm OD
Fits really nice on the petcock nipples (old dual version). Withstand modern fuels too.
But my carbs have 8mm connections so I have adaptors and use Gates Barricade fuel hose 7.9mm ID too.

Do not buy crappy cheap hose that will not cope with the fuel. I have done that mistake earlier this year.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline mcswny

  • Hot Shot
  • ***
  • Posts: 548
Re: Fuel hose size??
« Reply #9 on: May 20, 2015, 07:13:36 AM »
Just go OEM 5.5mm if you can. After all, it was made for these bikes. Makes taking lines off super easy. Used to have crappy 1/4" and in the end I had to use a heat gun to get it off, so dumb.
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline dgilling

  • Hot Shot
  • ***
  • Posts: 343
Re: Fuel hose size??
« Reply #10 on: May 20, 2015, 08:22:09 AM »
The trick to rubber lines is to not just pull on them, that just causes them to grip down harder on the thing you're trying to remove them from.  Instead push from the ends so that the hose expands from the pressure instead of stretching and contracting.

Just like a "Chinese finger trap".



mystic_1

definitely tried that.  it was not budging.  crazy tight. 

I buy Tygon line  ID 3/16" OD 5/16" on eebay or at local power equipment store and it goes easy on and easy off and never leaks.

Like this one:

http://www.ebay.com/itm/5-Ft-Tygon-Clear-Yellow-Fuel-Line-ID-3-16-OD-5-16-/230942030772?pt=LH_DefaultDomain_0&hash=item35c537bbb4

That stuff is great. Thin and flexible, easy to route without kinking, and self clamping.

does self clamping mean you don't need to add an external clamp?

I use USA made Gates Barricade  6mm ID, 13mm OD
Fits really nice on the petcock nipples (old dual version). Withstand modern fuels too.
But my carbs have 8mm connections so I have adaptors and use Gates Barricade fuel hose 7.9mm ID too.

Do not buy crappy cheap hose that will not cope with the fuel. I have done that mistake earlier this year.

6mm sounds like a good option.   I feel like taking off a tank is pretty common process and it shouldn't that difficult.  However, I have zero interest in gas spilling on my newly painted engine.  I went thorough already and had to do some re-painting. 

Just go OEM 5.5mm if you can. After all, it was made for these bikes. Makes taking lines off super easy. Used to have crappy 1/4" and in the end I had to use a heat gun to get it off, so dumb.
  shouldn't the 1/4in fit way more loose than the 5.5mm?

Offline dgilling

  • Hot Shot
  • ***
  • Posts: 343
Re: Fuel hose size??
« Reply #11 on: May 20, 2015, 08:26:52 AM »
also, do you need clamps with the 5.5mm hose?  doesn't seem like you would.  If you do, where do I find those?  All I see is 1/4 or 3/16 online. 

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,528
  • Bike almost back to the 70's 2015
Re: Fuel hose size??
« Reply #12 on: May 20, 2015, 08:27:25 AM »
Remember that ethanol in the fuel was not actual back in the days. That's a new problem like the absence of zinc in the oil.
I should never trust the old type of hose when there are ethanol and other chemicals in the fuel.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: Fuel hose size??
« Reply #13 on: May 20, 2015, 09:16:22 AM »
I have been using the Honda 5.5mm hose with no clamps and with no issues.

Offline Chachi

  • Hot Shot
  • ***
  • Posts: 713
Re: Fuel hose size??
« Reply #14 on: May 20, 2015, 10:02:28 AM »
I use Honda 5.5mm with no clamps. Works great. I bought the correct Honda 'clamps' -- those circle clip things -- for both fuel tap and carbs, but never used them. Honda line is not expensive from local shop, it's pliable and it fits (and removes) as it should. I bought it by the foot from my local shop.
73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1

Offline mcswny

  • Hot Shot
  • ***
  • Posts: 548
Re: Fuel hose size??
« Reply #15 on: May 20, 2015, 10:23:04 AM »
No clamps and you can get it on fleabay, they often dont say it fits a CB, but it definitely does.

just a quick search....
http://www.ebay.com/itm/New-Genuine-Honda-Bulk-Fuel-Hose-5-5-mm-Line-Sold-By-The-Foot-See-Notes-R20-/271782216115?fits=Make%3AHonda&hash=item3f477b81b3&vxp=mtr
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline MCRider

  • Such is the life of a
  • Really Old Timer ...
  • *******
  • Posts: 14,376
  • Today's Lesson: One good turn deserves another.
Re: Fuel hose size??
« Reply #16 on: May 20, 2015, 10:34:22 AM »
also, do you need clamps with the 5.5mm hose?  doesn't seem like you would.  If you do, where do I find those?  All I see is 1/4 or 3/16 online.
Clamps are not needed. Honda uses the minimalist single wire wrap clamp. We've had buyers specials here before, where one member would buy a bunch from here, https://www.alssnowmobile.com/PRODUCTPARTS.ASPX?pn_deptid=304  to mitigate the shipping then parse it out to members.

But 5.5mm is the key.
Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline dgilling

  • Hot Shot
  • ***
  • Posts: 343
Re: Fuel hose size??
« Reply #17 on: May 20, 2015, 02:44:10 PM »
I ordered a new 5.5mm Honda line from 4 into 1.  I also ordered a 3/16 in hose to compare.  both were pretty cheap.  the 3/16 hose is Helix Polyurethane and claims to provide "superior abrasions and kink, tear, oxidation and chemical resistance. Melting temp 370f Operating temp -75f to 155f This fuel line will not get hard, stays flexible."

I also got the Helix type in clear.  I like the idea of having a clear fuel line but if the fit isn't good i'll just stick to the 5.5mm Honda one.   

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: Fuel hose size??
« Reply #18 on: May 20, 2015, 02:59:20 PM »
No clamps and you can get it on fleabay, they often dont say it fits a CB, but it definitely does.

just a quick search....
http://www.ebay.com/itm/New-Genuine-Honda-Bulk-Fuel-Hose-5-5-mm-Line-Sold-By-The-Foot-See-Notes-R20-/271782216115?fits=Make%3AHonda&hash=item3f477b81b3&vxp=mtr
The seller, Everett Powersports, is close to me. 
They seem to dust off NOS and OEM stuff now and again.
I'll have to pay them a visit.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mineā€¦"

Offline Johnie

  • Really Old Timer ...
  • *******
  • Posts: 8,605
Re: Fuel hose size??
« Reply #19 on: May 20, 2015, 05:39:54 PM »
Been using 3/16 on all the bikes with no clamps. No issues. I get quality fuel line from Napa.
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline BobbyR

  • Really Old Timer ...
  • *******
  • Posts: 12,367
  • Proud Owner of the Babe Thread & Dirty Old Man
Re: Fuel hose size??
« Reply #20 on: May 20, 2015, 05:48:20 PM »
I have not have long term luck with the polyurethane line. It tends to get hard. It has not been a big issue since I swapped it out with the fuel filter. The Tygon seems better, but either will be fine. I gave up on the thick corded rubber hose. There is no pressure, so not need for cord. 
Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline ekpent

  • Really Old Timer ...
  • *******
  • Posts: 13,512
  • To many bikes-but lookin' for more
Re: Fuel hose size??
« Reply #21 on: May 20, 2015, 07:40:33 PM »
Been using 3/16 on all the bikes with no clamps. No issues. I get quality fuel line from Napa.
Yep, me too. Bought a huge roll at a hardware store close-out for cheap, may last my lifetime and I like it very much on the old Honda's.

Offline shmorty

  • Full Member
  • *
  • Posts: 1
Re: Fuel hose size??
« Reply #22 on: May 21, 2015, 08:36:17 AM »
I got 5.5mm fuel line from http://www.mamotorworks.com/ apparently old Volkswagens use this size too.

Offline edwardmorris

  • Youngish
  • Old Timer
  • ******
  • Posts: 3,142
  • Do not cause harm, nor respond to harm with harm.
Re: Fuel hose size??
« Reply #23 on: May 21, 2015, 09:23:39 AM »
Honda part numbers for all your hose needs

Honda OE Hoses

Fuel tube - 1 Metre long
Part number          - ID    - Color
95001-3500160M - 3.5mm - Black
95001-3500150M - 3.5mm - Black, braided exterior
95001-4500160M - 4.5mm - Black
95001-4500150M - 4.5mm - Black, braided exterior
95001-5500160M - 5.5mm - Black
95001-5500150M - 5.5mm - Black, braided exterior
95001-7500160M - 7.5mm - Black
95001-7500150M - 7.5mm - Black, braided exterior

Vacuum tube - 1 Metre long
Part number          - ID    - Color
95005-3500120M - 3.5mm - Grey
95005-4500120M - 4.5mm - Grey
95005-5000130M - 5.0mm - Black
95005-5500120M - 5.5mm - Grey
95005-7000150M - 7.0mm - Black
95005-7500120M - 7.5mm - Grey
95005-8000120M - 8.0mm - Grey

Offline Duanob

  • Bold Timer
  • Old Timer
  • ******
  • Posts: 4,005
  • Gotcha!
Re: Fuel hose size??
« Reply #24 on: May 21, 2015, 09:28:51 AM »
Been using 3/16 on all the bikes with no clamps. No issues. I get quality fuel line from Napa.

the problem I found, at least for the 550 is aftermarket fuel line is thicker outside diameter and can be a bear to fit through the carb bracket. But other than that i use it. I buy it from NAPA. I use clamps too.
"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

  __o
_- \_<,
(*) /' (*)