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The Oil tank is about 1/3 full - the tank is now probably lower than
the pump - the oil is definitely not coming through of it's own accord
so the level could be below the pump. The pipe is about 35 metres of
10mm copper.

The pipe runs from the tank, down underground, along, then up, along a
bit and down, then along again underground until it rises at the
boiler.

I have tried waiting for gravity to push the oil through (taken the
pipe off the pump) and also tried sucking it through - this seems to
get the oil through the pip, but it drops back again.

The boiler and burner will probably be inexcess of 20 years old.

I'm in Norfolk

cheers

Jeremy