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Author Topic: Fuel filter gasket?  (Read 944 times)

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Offline felicious

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Fuel filter gasket?
« on: April 28, 2014, 09:13:12 AM »
Hi,

I took my carbs out over the weekend and noticed a part that was new to me, under the air filter. It's soaked with fuel so I assume it's the fuel filter. The filter does not look great anymore and seal/gasket is not the right size.

I found the seal with cmsnl (17351390780) but I was hoping that there is a source in the US that sells these. Also where do you get the spongy part?

Also, I found a clear tube underneath my battery box (the box has a pre made hole for the tube) which did not seem to be connected. Where should this tube be connected to?

Thanks,
Felix
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Offline martin99

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Re: Fuel filter gasket?
« Reply #1 on: April 28, 2014, 09:33:36 AM »
It would help if we knew what bike. I'll take a guess at a 77/78F or K and suggest that the additional filter you're on about is the filter for the crankcase emissions system. Small black round thing with rubber pipes coming off it? One to the top of the airbox? Shouldn't be wet with fuel, but may be well oily. You can live without it, unless you care about the environment.

The clear tube should be connected to the breather pipe on the top of your battery. Plumb it away from anything on the bike so you don't get any acid damage.
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Build threads:
77 750F2 Refresh Project http://forums.sohc4.net/index.php?topic=144075.0
TRIBSA http://forums.sohc4.net/index.php/topic,160296.0.html

1977 CB750 F2
1958 Norton Model 99
2011 Triumph Street Triple 675

Offline Airborne 82nd

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Re: Fuel filter gasket?
« Reply #2 on: April 28, 2014, 09:49:44 AM »
Do you have a Honda?
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Offline felicious

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Re: Fuel filter gasket?
« Reply #3 on: April 28, 2014, 10:06:00 AM »
It's a '78 CB550.

« Last Edit: April 28, 2014, 10:10:43 AM by felicious »
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Offline flybox1

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Re: Fuel filter gasket?
« Reply #4 on: April 28, 2014, 10:12:39 AM »
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'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 mine…"

Offline felicious

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Re: Fuel filter gasket?
« Reply #5 on: April 28, 2014, 10:22:37 AM »
So I guess that part is important?
Can I get away with just ordering the seal from the Netherlands?
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Offline felicious

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Re: Fuel filter gasket?
« Reply #6 on: April 28, 2014, 10:36:07 AM »
I think I understand it a little bit better now after seeing this diagram.


So I guess a new seal is probably good to get the full functionality.
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Offline flybox1

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Re: Fuel filter gasket?
« Reply #7 on: April 28, 2014, 10:39:31 AM »
great diagram!  CB750's have a similar unit.

YES its needed...but they are listed as NLA (no longer available)
If you dont want to spend a bunch for one overseas...you could probably make one ;)
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'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 mine…"

Offline felicious

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Re: Fuel filter gasket?
« Reply #8 on: April 28, 2014, 02:22:59 PM »
Wow it's ~$45 shipped. Ouch.
How would you go about making on? Just cut the current one to the right size? Maybe glue it together?
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Offline flybox1

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Re: Fuel filter gasket?
« Reply #9 on: April 28, 2014, 02:31:44 PM »
cut it out of gasket sheet.  cork or rubber.
hardware or auto parts store should have it.
might run you $5
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'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 mine…"
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