Maintenance and repair services for fuel tanks and automotive radiators

Why does water gather in your gas tank?

It could be from many things. People seldom pay attention to where they rest the gas tank cap when filling up and will leave it in the rain, out on a damp surface or even in the snow.

Air also contains water vapour, and gas tanks as well as fuel systems absorb that moist air (especially when the cap is removed). In the same way, refineries and service stations’ larger storage tanks will also let in tiny amounts of air causing moisture to build up and dissolve in gasoline.


Traces of water can also come from the pipelines at so many different distribution stages like for instance, rain on the gas pump nozzle.

Isolated, none of these factors should cause a problem, but over time, all small quantities can build up and become a real concern. Refineries and gas station tanks are frequently checked and any excess water found is then removed.

In the case of much smaller tanks, the solution is adding gas line antifreeze. Gas tanks are designed to trap water at the bottom (hence the wavy shape of the gas tank bottom). When a car is moving, water can temporarily mix with the fuel and eventually become a problem.

During winter, this water can freeze in the the fuel lines and clogs them reducing the flow of gasoline to the engine. This usually occurs when temperature reaches freezing point.

This situation can generally be prevented by keeping the gas tank filled up more than half way and using gas line antifreeze to ”dry up” the tank.


Inspection and verification:

  • Radiator
  • Belt
  • Pressure
  • Liquid