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Petrol/Fuel tank D14
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paulpatto
Chorley, Lancashire
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November 4, 2021 - 4:37 pm
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Hi All,

As some of you may know, if you have read my previous posts, my project D14 came in several boxes of bits. Reviewing the bits, I noticed that my fuel tank has 2 taps fitted, one on each side. 

Is this standard? I don't think I have noticed it on others I have seen.

Thanks

Paul

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stubaker58
Sunny Felixstowe
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November 4, 2021 - 6:03 pm
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Hi,

I’ve seen a few like that, not sure which model it was used on. Seems like a good idea though and enables a reserve tap to be fitted.

Regards.

“There’s nothing new under the sun”.

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AdrianS
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November 4, 2021 - 9:32 pm
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In theory a good idea especially for a reserve tap, but….

I thought the outlet for the fuel tap was on the opposite side of the fuel filler cap. This was to allow for the petrol and oil to mix before swishing to the outlet side. If the tap was on the same side as the filler cap, then theoretically if you put some fuel in the bike and then a drop of 2 stroke oil in, the fuel on the outlet side may be oil rich and the other side of the tank oil weak.

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Sponge
Lancashire (A chip shop somewhere near Preston)
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November 4, 2021 - 10:06 pm
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A number of late D7 Silver models had two taps on a jellymould tank with a central filler. A really good thing and really useful when you are running low on fuel. Not fitted on a D14 though so if you are seeking authenticity then you may need to get rid or swap it for a single tap tank. If you did decide to sell I reckon therè would be strong interest. 

Downside is that you need 2 x petrol taps and a double banjo for your carb. 

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stubaker58
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November 5, 2021 - 9:13 am
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AdrianS said
In theory a good idea especially for a reserve tap, but….

I thought the outlet for the fuel tap was on the opposite side of the fuel filler cap. 

That was the case for the early tanks but the filler on the ‘jellymould” tank is central!

“There’s nothing new under the sun”.

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chippy
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November 8, 2021 - 5:11 pm
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Having drained my jellymould tanks using the taps I was a bit dismayed after removing the tanks to see how much fuel remained on the right hand side approx a litre, not a good thing I'm thinking as that amount is not available for use when its needed also the tank has to be removed every time it needs to be laid up due to the dreaded "E". So two taps per tank for me would be Ideal.

Chippy

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GlenAnderson
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November 8, 2021 - 6:43 pm
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chippy said
Having drained my jellymould tanks using the taps I was a bit dismayed after removing the tanks to see how much fuel remained on the right hand side approx a litre, not a good thing I'm thinking as that amount is not available for use when its needed also the tank has to be removed every time it needs to be laid up due to the dreaded "E". So two taps per tank for me would be Ideal.

Chippy  

That litre is your reserve. When you run out, lay the bike on its side to get it over to the other side of the tank. 

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chippy
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November 8, 2021 - 10:31 pm
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Yes Glen I agree to a certain extent, I tried that when I ran out but couldn't get it over enough to transfer it, you have to be fit enough and be without other problems to do that besides that does'nt dry the tank out for laying up.

Chippy

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Sponge
Lancashire (A chip shop somewhere near Preston)
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November 9, 2021 - 4:05 am
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I must admit that laying the poor thing over on its side is a bit medievel and I actually need to get it completely flat to splash enough fuel over to the left so a two tap tank would also be welcome in my world. 

To lay the bike up for the winter the  safest thing is to remove the tank and its fittings then store it upside down on a well ventilated shelf. I have also drained off and filled tanks with diesel but that's a lot of diesel to get rid of, it stinks and makes the petrol tap corks go funny.

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cocorico
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November 9, 2021 - 6:54 am
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And always keep in mind what these  bikes were designed for and when. What you want is outside any normal use envisaged back then.

BTW, I have yet to see any fuel tank that can be completely emptied via the tap(s). For a start, there is an upstand in the bottom of the tank that the tap screws into, then another on the tap itself before the outlet pipe, so there will always be a small amount requiring shaking, absorbing or evaporating.

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AdrianS
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November 9, 2021 - 10:19 pm
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It’s a lot of trouble emptying tanks. I’ve got 3 old BSA bikes and to be fair I don’t empty the tanks. I run the fuel down and at present use E5 petrol only. I add a bit of 2 stroke to the 4 stroke bikes and shake the tank well.

I also start them every 4 weeks or so and try and give them a short run.

so far I’ve had no trouble.

I had trouble with my old MGB with E5 petrol - all the rubber fuel hoses failed over a short period of time, usually when driving causing me to lose a lot of fuel!

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Coddy
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November 10, 2021 - 1:26 am
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Sponge said
A number of late D7 Silver models had two taps on a jellymould tank with a central filler. A really good thing and really useful when you are running low on fuel. Not fitted on a D14 though so if you are seeking authenticity then you may need to get rid or swap it for a single tap tank. If you did decide to sell I reckon therè would be strong interest. 

Downside is that you need 2 x petrol taps and a double banjo for your carb.   

Could use a stainless steel T piece inserted in the fuel line to the carb, also a lot easier to fit and would look neater. Can't use copper due to E10 issues on soldering joints.

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