Inside and outside there has lately been a very very strong smell of fuel Theres no visible leaks eg fuel puddles under the car
You will not see fuel puddles under the car. It would have evaporated before that. First thing is to check the fuel hoses, especially around the fuel filter. Check when the engine is cold. And also the fuel cap!
Have a search for "fuel smell" or something similar. As there are countless threads detailing the common causes and fixes for this issue youre having. To quick start you; The filler neck has an adapter to allow the cap to thread on and go tight (jap to aussie specs). The seal between the fill neck and adapter wears away allowing vapor to escape, even fuel spillage when cornering hard with a full tank. Normally the seal is nothing more then silicone or gasket goo. Fuel vapor attacks this and it becomes useless. Others have used a fuel safe product called "stag". This tends to become brittle and again the seal fails as the brittle stag product falls into the tank. Lastly the best method for sealing this is to remove the whole assembly and have it braised together. Quick check of this problem, is when tightening the cap. If it keeps rotating and not clicking as it should, the seals plucked. If its only slightly turning when its clicking its on its way out. Resealing is required. This is a common fault. Fuel lines in and around the engine bay can weep fuel or vapor. Usually due to hose clamps loosening off once the hose shrinks with age. Easy fix, replace fuel hose as required and nip up the clamps tight. There are short hoses under the battery tray that get missed. Also if the pumps been replaced, the seal that is between the fuel tank and sender lid can leak fuel vapor. Best to inspect this. Access panels are in under the parcel tray on a 2+0 and in the boot floor on a 2+2 iirc. The access panels can also allow residual fuel vapor into the cab as the foam seal between the access panel and boot/body work shrinks and perishes. Fix for this is to replace the foam seal. I used high density foam that had double sided tape on it. Works a treat and kept the vapor out of the cab. These are common faults. More can be found and explained in depth via a search. Happy hunting.
all very good advise in deed... make sure you look under the accelerator cable cover, the front of the fuel rail is notorious for this, best to do this when car is cold and use a torch. PS. do not drive the car with this problem, the possible outcome is too horrible to mention.
My car had a strong smell of fuel once, it turned out to be a hose connected to the fuel damper. There was no puddle under the car it was on top of the engine instead.
