Join Date: Jun 2003
Location: Melbourne, Victoria, Australia
I have been reading a report in one of my magazines, comments by some one who has spent most of his working life in the petroleum industry, that there are certain points to keep in mind when filling up. I make no assertion as to the correctness or otherwise of these hints. For you to decide.
1. Buy your petrol in the early hours when the ground is still cold. Colder the ground, more dense the petrol. Petrol expands so in the evening a litre may not be a litre.
2. Fill slowly. The pump has a vapor return, some of the petrol going into your tank become vapor and returns to the storage tank
3. Fill up when half full (petrol we are talking here) More petrol in your tank the less air. Petrol evaporates very fast. Petrol storage tanks have an internal floating roof. The roof serves as zero clearance between petrol and the atmosphere so it minimizes the evaporation. Petrol trucks when being loaded are temperature compensated so that every litre is actually that amount.
4. Never fill when the tanker is at the servo. Guess everyone knows that one. The petrol is probably being stirred up and the water and dirt that sits in the internal sump is likely to end up in your tank.