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T: Fuel Tank Petrol taps

vibrac

Well Known and Active Website User
VOC Member


Those stainless steel ball petrol taps with the black plastic handles a bit like this
adorn all my bikes ever since Ron Kemp introduced them to me 20 or more years ago
belatedly (a few years ago) I have been told on this forum how to adjust the ball with a lage allen key but I have one tap that persistently drips
I suspect the o ring that I assume is in there has given in to the ethanol
is that it ? has anyone refurbished one?
 

Comet Rider

Well Known and Active Website User
VOC Member
Tim,
It's cheaper to go to Screwfix or Toolstation and buy new ones. I've never got a leaking one to work properly. It's the teflon seal it wears out

Neil
 

bmetcalf

Well Known and Active Website User
VOC Member
I searched for “ball valve “ on both those sites and didn’t see any with 1/8” male ends. Any other sources?
 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
I got mine from Screwfix. They are listed under gas parts, mini ball valve in three sizes, 8 x 8 mm, 10 x 10 mm and 15 x 15 mm. I think the ones I got were 10 x 10 mm. The thread is 1/4" BSP. They have lots of outlets in the UK. I think they would be available at a similar type of DIY store in the USA. You could take a petrol pipe fitting into the shop with you and check the thread. They are shown on the page at the link below:
Screwfix mini ball valve link.
 

Robert Watson

Well Known and Active Website User
VOC Member
In the US they would likely be 1/4 NPT which is tapered and 18 TPI --- BSP is straight and 19 TPI.
I bought mine when in the UK. I have them on several bikes and no leaks.
 

oexing

Well Known and Active Website User
VOC Member
Don´t forget to check Ebay , there are a myriad of dealers, so a big chance to find just the type of item you are chasing:
ball valve
or from UK:
ball valve 1/8
To be open, I would not like the looks of these on my bikes, too modern. Instead you could modify the taper type brass taps by copying the taper in stainless and lap that with extremely fine paste in the tap. Brass mated with brass - or any same type materials - does not work in the long run, simply seizes.
Vic
Leitungen.JPG
 

greg brillus

Well Known and Active Website User
VOC Member
Ahhhhhhhhhh..........fuel taps..........Probably one of the more frustrating parts of old bikes, especially if you have a black engine. These taps shown are great, I used them on the Vincent racer and also use them on my new toy, again a racer but an Eso/Norton for the fuel and oil taps. I found the small screw holding the lever on can come undone and the lever falls off never to be seen again. I removed the ones on the new bike and put loctite on the small threads to stop this happening again. Only downside is they don't have any filters, but I have an upswept line to the Amal 302 float bowl that would trap any foreign matter, quite critical on those type float chambers that readily flood.
 

bmetcalf

Well Known and Active Website User
VOC Member
The ones I bought from your Dad in the ‘90’s had a male bsp end for the tank and I believe a compression end with nut removed for the petrol pipe union nut. Those seem to be harder to find.
Any other suggestions for a modern ball valve with ends like this? (screen not required.)

 

greg brillus

Well Known and Active Website User
VOC Member
I always use a liquid pipe/hydraulic sealant smeared around the flange and around the thread. I never have any leaks, plus the sealing washer is important too, the ones the VOC spares sell for the oil pipe banjo's work very well as they are soft. I don't like the red fiber washers as these are too hard, except on the stock carb banjo fittings, and sometimes the soft sealing washers help out here as well. Another washer that works very well on the lever taps with the loose adjusting nut are the copper ones with the rubber insert, a bit like a Dowty seal, as they crush and this forces the rubber insert hard into the thread which seals it. Petrol taps are a real pain, especially when they leak internally..........This is a common cause for the original side bowl carb's to continually drip fuel even after the bike is sitting for some time. Disconnect the pipe fitting and leave a small container left under the tap overnight to see if it is leaking, you will soon know, this applies to the original push/pull taps as well which are notorious for leaking. Not good on a Black engine for sure..............
 

bmetcalf

Well Known and Active Website User
VOC Member
VOCSC sells these ball valves - P/N T28/4

I wonder if they were available 18 months ago when I was looking and I just assumed the weren't?
 

vibrac

Well Known and Active Website User
VOC Member
I think Ron Kemp introduced me to them decades ago to my shame it was only when one leaked.a year or so ago some kind person on here told me they were adjustable.
 

stu spalding

Well Known and Active Website User
VOC Member
Hi Tim, if you use the allen key to completely remove the threaded collar, the seals and ball will come out. You may be able to turn a new seal from a bit of nylon. Cheers, Stu.
 

brian gains

Well Known and Active Website User
VOC Member
these are seals I've bought off fleabay, not specfied as viton but you can see what effect soaking in Texaco's finest overnight had. nb this was not molested in any way.
TapSeal.jpg
 

vibrac

Well Known and Active Website User
VOC Member
Supermarkets are for oranges and soap flakes, coming to rest with an empty tank opposite a hand car wash in a newly disused petrol station is all the disincentive you need :mad:
Esso Supreme is our last hope:( (for the moment)
 

bmetcalf

Well Known and Active Website User
VOC Member
My problem with my Kemp tap from the '90's is that it rotates too freely. I've ordered a new one from the VOCSC, but I'll try adjusting this loose one to see how it does.
 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
I've been using taps from Screwfix for several years without any problems. From memory, they are around £6.00 and don't seem to have any leaking problems. They are sold for washing machine/central heating, etc.
 

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