hmm,
keep the petrol in tank over a quarter, running with low fuel places strain on the pumper because its pumping less thinner petrol and the same amount of gunk (just crap that gets into the tank)
will help keep the pump healthy and fend off the light.
get some injector cleaner (dont know much about them but you can get fuel additive ones, not sure how effective)

if it keeps popping up do the filter (make sure to use proper tube spanners).
then check the inside tank filter.

then try replace regulator??

google this stuff to find the procedure/diy