The MX5 fuel tank fits under the rear cover. Brackets are welded to the chassis and holes need to be drilled in these to mount the tank. The filler pipe and filler cap from the MX5 can be used. (Be aware of IVA regulations that if the fuel cap is not lockable it must be tethered, if it is lockable it must not be possible to remove the key from the filler cap until it is locked back in place). Note MK2 tanks are taller so you may need to hang the tank from under the brackets for clearance.

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Later donor (MK2) tanks might need to be rotated so that the inlet is behind the drivers seat and dropped as described. All tanks also need a good earth to the frame as this will be tested at the IVA inspection, this can be done either through metal contact but as it's better to mount the tank on rubber then it's easier to use an earth bonding cable.

Mk2 tank below. Filler neck shortened and clamped to a properly rated fuel flexi hose. Fuel lines secured with p-clips and wrapped in nylon hydraulic line protector.

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Following a similar route to the above install with the later tank using the G type tank cover, it's possible to use a number of cheap parts along with the original fuel neck breather and flange. The tank uses a smaller diameter inlet than the filler neck so you can try and find a fuel safe hose with a 90 degree bend or simply use a 51mm hose and then part of the original rubber hole attached to the metal inlet on the tank, this is then covered by the silicone hose and clamps securely. If you are going to use this method please make sure it is leak free.

The original neck needs to be cut to make the middle metal pipe as shown, this is allow the breather connection to the filler pipe. Another method would be to use a suitable insert for silicone hose to “tap” in to the hose. The metal flange end of the original pipe can also be used as a backing for the neck filler, this provides support for the bolts to help stop the GRP stressing. It needs to be cut off and then filled in the centre to allow the plastic neck to fit secure.

The original breather hose can be used and cut down slightly to give a bend without kinking.

You can also use a very similar method to the above but using flexible fuel hose, this allows bends and can provide flexibility when removing the cover. CBS sell flexible fuel rated filler hose.

The black plastic filler inlet was from Ebay and is fuel rated, see here

The special lined silicone hose was also from Ebay here [NOTE: the lining of the silicone hose may not be able to withstand being constantly in contact with petrol, meaning this may not be the best solution]

A commonly debated point on the owners club is the requirement for a fuel drip tray, it seems some IVA inspectors expect this and others do not.

The common method is to use a sheet of aluminium and bend it to fill the space under the tank, this can be bolted to the frame. Make sure that it leans away from the exhaust so that any fuel that does end up on the tray does not run towards the hot exhaust.