Key Info: Filler Caps

[D-Rider]

Filler Caps:

• The Carbon Fibre tanks will accept the standard Aprilia filler cap.
  • The Aprilia filler cap contains a breather and of course, allows you to retain your filler cap lock with the same key as the ignition switch. Richard’s experience with RS250 filler caps is that the breather is prone to blocking – though I have no idea whether the same is true for the Falco’s cap
  The tanks will also accept any Aprilia Falco Compatible race filler cap.
  • Good quality race filler caps will have a breather and will be less prone to water ingress than the Aprilia cap.
    You may find a locking one but most don’t lock. Those that do lock will have a different key to your ignition lock.
    Richard emphasises to buy good quality product rather than the typical ebay fare.
  So, the choices are …..
  • * Stick with the Aprilia cap you have now
    
    * Source your own Race cap
    
    * If there are enough of us that can agree on a common good quality race cap, we can explore a group buy.
    
    Of course, it would be possible to run with a race cap for year –round use but if you were touring and wanted to lock your fuel away, you could swap to your OEM cap.
  I’m in for the group buy if others are too.
  We are individually responsible for the costs of whatever fuel cap we choose.
  
  If you are interested in exploring a group buy for a good quality race filler then please post up below

[Viking]

I don't know if this is the right place to ask...

I've transferred the filler cap from the standard tank to the CF tank.

When the tank is full, there is a terrible smell of petrol in the garage - as if the filler cap is not sealing well into the body of the tank. The bit that opens seems to fit and seal well within the body of the filler cap.

Has anyone else had this problem? If so, what did you do to fix it?

Thanks.
V

[D-Rider]

I don't know if this is the right place to ask...

I've transferred the filler cap from the standard tank to the CF tank.

When the tank is full, there is a terrible smell of petrol in the garage - as if the filler cap is not sealing well into the body of the tank. The bit that opens seems to fit and seal well within the body of the filler cap.

Has anyone else had this problem? If so, what did you do to fix it?

Thanks.
V

Yep.

Changed the fuel pump gasket in case that was the problem .... to no avail.

The only way I've found to stop the garage smelling of fuel is to take the bike out .....

If you come up with a better fix, let me know.

[Viking]

Woo! We have a solution to the problem.

Remove the entire filler cap assembly - there's only 3 bolts, so a quick job.

Under the filler cap there is a round, black rubber gasket sort of thing. Lift up the gasket and remove any traces of petrol.

Put a good bead of petrol-proof sealant (I used the red Loctite sealant recommended for use around the petrol pump mounting plate) around the outer circumference of the recess the filler cap goes into, and a good bead around the hole in the middle (where you put the petrol in). Don't forget to put a small circle of sealant around the bolt holes where the filler cap is bolted down.

Install the gasket and repeat the beads of sealant. Install the filler cap and tighten the 3 mounting bolts to a reasonable torque.

Clean up any sealant that oozes through any gaps.

Done.

A few days later, and a very much reduced smell of petrol in the garage.

[mangocrazy]

Good man. So your garage no longer smells like a refinery?

[spiderwheels]

Doesn't that interfere with it's breathing?

[Viking]

Ooops... Managed to double-post it.

[Viking]

Good man. So your garage no longer smells like a refinery?

Definitely much clearer air in there now, and a lot easier to breath!

Doesn't that interfere with it's breathing?

I doubt it. There's still a good gap around the bit that lifts up, and there are vents within it as well.

I drew a very crude diagram in page 7 of the 'Updates' thread when we were discussing this.

https://www.ridersite.com/viewtopic.ph ... 2&start=97

Here's the image:

https://drive.google.com/file/d/0B2EFSY ... sp=sharing

[spiderwheels]

Thank you. I've finally got around to buying some loctite for the pump seal so I hope to fit the tank this week. I'll perform your mod while I'm at it.

[D-Rider]

..... another one for the "To-Do" list.

Thanks :)

[Viking]

You're welcome, all.

Drop me a note if you have any questions / problems and I'll help.

[Viking]

And now I find that the tank is not venting properly in the heat...

Not a negative pressure problem, but a positive pressure problem - the expanding vapours can't escape as the fuel heats up and you get a mighty 'Whoosh!" when you open the filler cap.

Anyone got any handy pointers on how to fix this?

(I would head down the path of a proper-venting racing cap, but don't like the idea of not having the fuel locked away.)

Cheers,
V

[Viking]

OK, I never did get around to finding a suitable replacement filler cap. The ones I remember seeing on eBay weren't lockable so I didn't look much further.

Has anyone found a suitable replacement that's reasonably priced?

Thanks,
V