
I bought a brand new pela 6000 oil extractor from a chandler in Warrington yesterday, (£29.99

Its first task was extracting 20 litres of diesel/veg oil mix from a tank i use,which was then tipped into the bongo's fuel tank.
No problems there.
I bought the pump primarily for interim oil changes on the bongo,but thought i'd try out an oil change on my 1999 ford focus turbo diesel estate that i use for work.
Im not entirely certain i'm doing it correctly though.... the capacity for the focus is four something litres, but i can only extract nearly three litres with the pump

This query is for more experienced Pela pump user's really, am i doing something wrong? Why cant i extract the other litre or so?