Hi
I have a leak in a MK petrol tank its at the top where the plate has been put in to take the sender (not fitted) it appears that the joint is leaking when full. Whats the best thing to seal it
Charlie

Cork or neoprene gasket. Deffo not silicone sealant.

adrian

Its a plastic welded joint

Don't seal it, replace it!!!
A while ago MK had some plastic tanks made which were welded with the wrong filler, it has been well documented here. How old is your tank?
I would suggest a call to MK as they were replacing plastic tanks with ally ones.
Is your car SVA'd? If not, the plastic tank wouldn't pass IVA now, they need a certificate.

Now were going back in history to the era of PTM in all honesty not a lot that can be done

tony