Slaby fuel tap

[yyt]

Anyone knows the O-ring sizes of the fuel tap?

In the Suzuki parts it comes as a complete Tap ( FUEL TAP (F G MODEL) (44300-27A00) ).

But i'm going to just replace the 2 O-rings.

I can sort of figure out the size (the oval will be from a round seal) and was hoping did it before me.

Or any one knows a kit that fits?

 

[duncan]

Have the same repair coming up. Not much of a help, more a reminder to myself to keep an eye on this thread sorry

[Simbec1863]

Wemoto in the uk does a fuel tap repair kit  for the F G  and H models which includes the o rings you need,I have used one and it worked fine was about £13

http://www.wemoto.com/bikes/suzuki/gsxr_750_f/85/picture/fuel_tap_repair_kit/

They also do complete fuel taps for about £50

 

[yyt]

I"m not sure its the same size.

Mine doesn't have the vacuum connection, just a tap (on/off/res) and only 1 hose going to the carbs.

That repair kit is for the diaphragm Carbs.

 

 

[Simbec1863]

I only used the o rings not sure if the picture on wemoto is just a generic one

Edited November 5, 2017 by Simbec1863

[CockneyRick]

I was after a slabby tap & was reliably informed that the 7 & 11 taps are different bolt hole sizes, therefore making the seals different sizes  

[KATANAMANGLER]

1 hour ago, CockneyRick said:

I was after a slabby tap & was reliably informed that the 7 & 11 taps are different bolt hole sizes, therefore making the seals different sizes  

They are. Spacing is 35mm between mounting points on 750 amd 42mm on the 1100 ( from memory)

 

[yyt]

Anyway I measured the  Tap's O-ring gaps and ordered from e-bay:

Viton  1.9mm  O-Ring- O.D. 17mm.

Viton  2.4mm  O-Ring- O.D. 40mm.

Will inform when they will arrive, it takes about a month..

[canamant]

I have 3 750 tanks with 2 different bolt spacings.  Anyone know where to get simple on/off fuel taps to fit ?

Thanks

[duncan]

I checked the standard O-ring list, and I cannot find 13.2x1.9 nor 35.2x2.4, regardless of material. Closest I can find:

For the 17mm:

• 13x2
• 13.2x1.78

For the 40mm:

• 34.6x2.4
• 35x2.5
• 36x2.5

Available in NBR 70, 90 or Viton off the shelf. And that's using a pretty exhaustive catalog. Either I'm searching wrong, or you're measuring wrong, or something strange is going on. What did you end up ordering exactly, and why should it take a month? You're getting some custom made ones?

[duncan]

Ok, had to know so I took apart my fuel tap to measure. I'm getting 14x1.5mm (17mm outer) for the tap side, and 2.5mm thickness plus an unmeasurable length for the tank side because of the non-round shape.

Calculating the length, inner diameter of the groove is 12mm diameter and 34mm for the straights, making 33.64mm inner diameter. Outer is 17.8mm diameter making 39.44mm outer diameter. But then, thats based on the groove size which is (17.8-12) / 2 = 2.9mm wide, and 2mm deep. Need to allow for expansion so 2.5mm should be a good thickness. A ring 34x2.5mm (39mm outer) should be a good fit.

Both 14x1.5 and 34x2.5 are standard O-ring sizes, should be easy available and cheap (under 50 euro cents a piece when ordered individually).

 

Edited November 7, 2017 by duncan

[yyt]

I always order from China coz its cheaper and easy to order that's why it takes a month :-(

Locally its pain in the ass to find.. half a day on the phone, than half a day to get there, than they tell you they thought they have it but they misunderstood.

I always prefer Viton for fuel applications, so at e-bay i write "viton" and the diameter I need.

For the tap: 

The gap is:  O.D-17.2mm /  I.D.- 14mm  = 3.2/2 = 1.6mm

A rough calculation of the O-ring diameter is 20-30% bigger for squashing depending on application.

So 1.9 -2.0 mm  diameter is good and outer diameter of 17mm will be fine.

For the flange of the tap I also did a rough estimate and your (Duncan's) estimate of about 39mm outer diameter is good.

The grove is 2.10mm, so 2.5mm O-ring diameter is  good.

In Viton I found only 2.4 Ø and 40mm outer diameter.

[bernardo]

I'm watching this as I have the same problem.  I've seen rolls of o ring rubber for sale ,  though I'm not sure how well the joint would stand up to petrol. Have you a link to the Chinese supplier?

[duncan]

Can order them through business suppliers (using Eriks.co.uk here), but plenty available on Eblag too. A quick search for "14x1.5 viton" brings hundreds, and for acceptable prices (< 1 euro a piece when ordered per piece, way cheaper in bulk). I do not see why you would order from China and wait, you can have it tomorrow... but to each his own.

I've ordered mine, 10 euro gets me delivered 5 of each, and half of that money is delivery/small order costs. Arrives tomorrow. Thanks for helping with measurements!

Edited November 8, 2017 by duncan

[yyt]

Hope the 1.5 dia. will do.

The gap is 1.6mm, I wrote it should be 1.9 to 2.0mm dia.

[duncan]

Hope so too! Will be back home next week then I can try and report. Main reason for getting a 14x1.5 is that the original measured to that size. The gap is indeed way bigger.

[Blue]

How did you guys get on rebuilding fuel taps? Did you also replace the o ring inside the outlet?

Edited July 23, 2018 by Blue

[clivegto]

Don't think it is supposed to have a O ring my one don't have one.

[CockneyRick]

Well it's either an O ring, or a sprung wire circlip? Although the latter wouldn't stop it leaking, just hold it in place!

[Brians 7/12]

Does that outlet part just pop out?... haven’t really looked at mine... was surprised it came apart... lol... don’t want it popping off accidentally when taking the tank on & off !!  :-/

[clivegto]

54 minutes ago, Brians 7/12 said:

Does that outlet part just pop out?... haven’t really looked at mine... was surprised it came apart... lol... don’t want it popping off accidentally when taking the tank on & off !!  :-/

Yes it's just a push in fit.

[Brians 7/12]

eek... lol... better check mine... Thanks Clive !!  :-)