Oil tank lifter problem

[Allan marsh]

Oil tank lifter has 12 litre tank and electric pump. The AGA uses 40 litre a week so the normal activation of the pump is every 2.5 days usually. But for the last week it had switched on daily for 5 mins which is the usual time it takes to fill it normally.
any idea men, as to why this has just started.
i have two tanks connected, so the blockage on one outlet line should not occur. Before the lifter is a filter but that's all before the pump.

i,m lost


Allan

 

[TVP&H Ltd]

Possible leak on feed pipe to lifter allowing air in and oil line to empty back to tank. The daily running is to refill the lifter from empty. Or a possible leak on pipe from lifter to Aga control box.

 

[Allan marsh]

thanks ever so... only 10 joints to check

 

[lame plumber]

10 too many