petrol tap problem

[KevinH-4]

After recently buying my 02 1200, I decided to renew the fuel and vacuum hoses. However, when I removed the petrol tank, fuel was pouring out of both outlet pipes!

After searching on the forum, I stripped the petcock, cleaned the small amount of debris out, but this didn't work. Then I inserted a piece of wire into the vacuum hose outlet of the petcock, in order to reset the plunger.

Now, if you remove the  4 screws of the vacuum hose outlet casting and look inside it, pressed into the casting there is a small metal disc with a 2mm hole in its centre. The hole seems to be sealed with a runner or plastic membrane.

When I inserted the wire into the vacuum hose outlet, I punctured this membrane, however the outlet pipes no longer leak petrol when I hold the tank level!

So I'm left wondering have I damaged the petcock by inserting the wire, or should this membrane have been removed during initial assembly? I've searched for exploded diagrams without success. Can anybody help please?

Welshkev.

[Ed Johnson-3]

        I have two questions; #1. With this membrane punctured, will the
bike still run? #2. Why do we need such a complex system of simply turning
the fuel on and off? With my old Bonneville, when I ran low on fuel, I put
more in. If I failed to put more in, I had to find some somewhere when I ran
out. Sometimes that entailed a situation that involved a long walk and an
unprotected bike sitting along side the road somewhere. I'm pretty sure that
lesson lasted a long time so I didn't ever do it again, if indeed I ever did
it once! I think that fear caused me to be aware of the simple fact that a
gasoline engine will not run without gasoline. (Petrol if you prefer).
        Seems to me that with that membrane punctured, the vacuum couldn't
possibly open the valve and the bike will only run in the PRI position. Of
course I'm using logic and so far that has not helped me one iota in the
refurbishing efforts I've made on my '64 Bonneville. <G>
Regards
Ed J.

-----Original Message-----
From: TriumphTrophy@... [mailto:TriumphTrophy@...]
On Behalf Of KevinH
Sent: Sunday, November 01, 2009 12:37 PM
To: TriumphTrophy@...
Subject: [TriumphTrophy] petrol tap problem

After recently buying my 02 1200, I decided to renew the fuel and vacuum
hoses. However, when I removed the petrol tank, fuel was pouring out of both
outlet pipes!

After searching on the forum, I stripped the petcock, cleaned the small
amount of debris out, but this didn't work. Then I inserted a piece of wire
into the vacuum hose outlet of the petcock, in order to reset the plunger.

Now, if you remove the  4 screws of the vacuum hose outlet casting and look
inside it, pressed into the casting there is a small metal disc with a 2mm
hole in its centre. The hole seems to be sealed with a runner or plastic
membrane.

When I inserted the wire into the vacuum hose outlet, I punctured this
membrane, however the outlet pipes no longer leak petrol when I hold the
tank level!

So I'm left wondering have I damaged the petcock by inserting the wire, or
should this membrane have been removed during initial assembly? I've
searched for exploded diagrams without success. Can anybody help please?

Welshkev.



 

[KevinH-4]

Hi Ed,

As a foot note to my original message, the membrane which I've punctured isn't the one which holds the metal plunger in place. In fact you can only see it through the 2mm hole in the disc.

Also, I attached a length of vacuum pipe to the outlet and when I sucked on the pipe, I could hear the plunger moving.

Welshkev

ps agree with your comments!

--- In TriumphTrophy@..., "Ed Johnson" <edljohnson2@...> wrote:

>
> I have two questions; #1. With this membrane punctured, will the
> bike still run? #2. Why do we need such a complex system of simply turning
> the fuel on and off? With my old Bonneville, when I ran low on fuel, I put
> more in. If I failed to put more in, I had to find some somewhere when I ran
> out. Sometimes that entailed a situation that involved a long walk and an
> unprotected bike sitting along side the road somewhere. I'm pretty sure that
> lesson lasted a long time so I didn't ever do it again, if indeed I ever did
> it once! I think that fear caused me to be aware of the simple fact that a
> gasoline engine will not run without gasoline. (Petrol if you prefer).
> Seems to me that with that membrane punctured, the vacuum couldn't
> possibly open the valve and the bike will only run in the PRI position. Of
> course I'm using logic and so far that has not helped me one iota in the
> refurbishing efforts I've made on my '64 Bonneville. <G>
> Regards
> Ed J.
>
> -----Original Message-----
> From: TriumphTrophy@... [mailto:TriumphTrophy@...]
> On Behalf Of KevinH
> Sent: Sunday, November 01, 2009 12:37 PM
> To: TriumphTrophy@...
> Subject: [TriumphTrophy] petrol tap problem
>
> After recently buying my 02 1200, I decided to renew the fuel and vacuum
> hoses. However, when I removed the petrol tank, fuel was pouring out of both
> outlet pipes!
>
> After searching on the forum, I stripped the petcock, cleaned the small
> amount of debris out, but this didn't work. Then I inserted a piece of wire
> into the vacuum hose outlet of the petcock, in order to reset the plunger.
>
> Now, if you remove the  4 screws of the vacuum hose outlet casting and look
> inside it, pressed into the casting there is a small metal disc with a 2mm
> hole in its centre. The hole seems to be sealed with a runner or plastic
> membrane.
>
> When I inserted the wire into the vacuum hose outlet, I punctured this
> membrane, however the outlet pipes no longer leak petrol when I hold the
> tank level!
>
> So I'm left wondering have I damaged the petcock by inserting the wire, or
> should this membrane have been removed during initial assembly? I've
> searched for exploded diagrams without success. Can anybody help please?
>
> Welshkev.
>

[Bob Clark-2]

Yes you have damaged it.  A new diaphram and related overhaul parts is
not expensive from Triumph. In it's present state your bike will starve
for fuel and not run very far.
Get the parts to rebuild the petrol tap.


Bob Clark
01 Sunset Red Trophy 1200
Jacksonville, FL / Augusta, GA

KevinH wrote:

>  
>
> After recently buying my 02 1200, I decided to renew the fuel and
> vacuum hoses. However, when I removed the petrol tank, fuel was
> pouring out of both outlet pipes!
>
> After searching on the forum, I stripped the petcock, cleaned the
> small amount of debris out, but this didn't work. Then I inserted a
> piece of wire into the vacuum hose outlet of the petcock, in order to
> reset the plunger.
>
> Now, if you remove the 4 screws of the vacuum hose outlet casting and
> look inside it, pressed into the casting there is a small metal disc
> with a 2mm hole in its centre. The hole seems to be sealed with a
> runner or plastic membrane.
>
> When I inserted the wire into the vacuum hose outlet, I punctured this
> membrane, however the outlet pipes no longer leak petrol when I hold
> the tank level!
>
> So I'm left wondering have I damaged the petcock by inserting the
> wire, or should this membrane have been removed during initial
> assembly? I've searched for exploded diagrams without success. Can
> anybody help please?
>
> Welshkev.
>
>
> ------------------------------------------------------------------------
>
>
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> Version: 8.5.423 / Virus Database: 270.14.43/2474 - Release Date: 11/01/09 07:38:00
>
>  

[Colin Watkins]

You have probably destroyed the non-return valve in the fuel tap!

 

This is designed to stop flames from the carburettors feeding back into the
fuel tap! This is a very rare thing!

 

The non return valve  is also a source of the problem you have described. It
can stop the tap from turning off when the engine stops. I destroyed the non
return valve in my Trophy about four years ago when I had exactly the
symptoms you describe. The system has worked perfectly since then and I have
not had any engine fires!

Colin

 

From: TriumphTrophy@... [mailto:TriumphTrophy@...]
On Behalf Of KevinH
Sent: 01 November 2009 17:37
To: TriumphTrophy@...
Subject: [TriumphTrophy] petrol tap problem

 

 

After recently buying my 02 1200, I decided to renew the fuel and vacuum
hoses. However, when I removed the petrol tank, fuel was pouring out of both
outlet pipes!

After searching on the forum, I stripped the petcock, cleaned the small
amount of debris out, but this didn't work. Then I inserted a piece of wire
into the vacuum hose outlet of the petcock, in order to reset the plunger.

Now, if you remove the 4 screws of the vacuum hose outlet casting and look
inside it, pressed into the casting there is a small metal disc with a 2mm
hole in its centre. The hole seems to be sealed with a runner or plastic
membrane.

When I inserted the wire into the vacuum hose outlet, I punctured this
membrane, however the outlet pipes no longer leak petrol when I hold the
tank level!

So I'm left wondering have I damaged the petcock by inserting the wire, or
should this membrane have been removed during initial assembly? I've
searched for exploded diagrams without success. Can anybody help please?

Welshkev.





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