Hello

I'm thinking that I might neglect to have an external fuel filler cap mounted on my rear panel and use a motorbike style fuel filler cap mounted directly on top of the tank.

More boot space as there is no filler hose in the way, but maybe a bit annoying to get to when the boot is full. Any thoughts and opinions gratefully received!

Josh

If I'm reading correctly you cant use the same space as the filling point for 'luggage' (item 14 below)

Okay... I was thinking I would end up building a 'boot compartment' that sits on top of the diff cage and tank, with a hinged flap above the fuel filler cap.

If none of this was present at the IVA, would it pass? I believe the Haynes book car had an internal fuel filler cap mounted on the top surface of the tank?

Thanks
Josh

Yes the book car did. Keeping it simple for IVA and adding it later would probably be the safest option and should be fine.

Bruce

Having the filler cap on the rear panel is a nighmare.
The hose has to go through such a tight bend on mine that it makes getting fuel in a total pig. If I don't get the angle just right the pump either clicks off as soon as I press the trigger or the fuel pisses straight out onto my feet.
Even when I do get it right I can only hold the trigger in the slightest amount to stop it clicking off and it takes forever to fill up.

I'll be switching to a cap mounted directly to the top of the tank in the near future...

Have been discusing this over on LocostBuilders too. I have now decided to mount an external filler cap on the top panel. I'm hoping to use my car for road/camping trips around the UK and Europe - this will mean a full boot and multiple fuel stops. A cap directly on top of the tank will be a right pain!

If I put the filler neck in the rear right corner of the tank then the filler hose will cause minimum obtrusion into the boot space too.

One last question - how have people done their tank vents? Will a one-way valve be enough to allow air to enter the tank as the fuel level lowers, or does it need to be two-way to allow for expansion of air on a hot day?

Mines a length of 8mm cu central heating tube open vented from the top of the tank ,rising about 4" above the tank then looping down to floor level .

I assumed that there was no need for a valve - just an open ended pipe shaped in such a way that fuel couldn't flow out when the tank was full?

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Mine passed without a valve, and it pisses fuel out of the breather if I manage to brim the tank!
All I have is a length of fuel hose attached to a breather outlet on top of the tank. The hose goes up a few inches, bends through 180 degrees, then goes back down and ends just below the bottom of the tank.