A clean, leak-free petrol tank is vital for the reliability and safety of your classic car, but its internal condition is often overlooked, resulting in rust and crud clogging the system.
If your car still has its original steel item, chances are it has muck inside, particularly if the car has been off the road for any length of time.
When petrol evaporates it leaves sticky varnish deposits, while trapped moisture will rust the walls. Removal and a thorough flushing is the only way to clean it.
You can take this opportunity to apply a vinyl-resin lining that in effect creates a bag inside the tank to seal minor leaks and prevent future corrosion.
Examine the tank’s seams, too, for corrosion and damage, and ensure that the plumbing is in good order. And consider adding a fuel stabiliser to preserve the tank if your classic isn’t used much or is stored in winter.
Always disconnect the battery before working on a fuel system and never attempt to weld a tank; even old ones that have been empty for years can still harbour flammable vapours.
Even wire-brushing can cause sparks, so always work in a well-ventilated area, preferably outside, and have an extinguisher handy in case the worst happens.
1: DRAIN THE FUEL
Ensure that the tank is as close to empty as possible and always use a certified receptacle. Leave the filler cap on to help moderate the flow.
