As a postdoc, should I expect my PhD adviser to fund my conference travel to present my PhD work? I am scheduled to present part of my PhD research
at a conference in a few months.
This will be my first conference after graduating from my PhD.
I am now a postdoc at another university,
but my current adviser's policy is to fund conference travel
only for postdocs presenting research done by with him,
i.e. he would not fund my travel to this conference
to present research I had done during my PhD
which did not involve him.

Is it normal for a PhD adviser
to fund conference travel for graduated students,
if the students are presenting work they have done during their PhD?
If the graduated student had tenure-track jobs
and their own source of funding for conference travel,
then clearly the graduated student
would be expected to use his/her own funding.

However, in my case,
when I do not have funding for conference travel,
is it normal to expect my PhD adviser to provide funding?
I will ask my adviser about this directly,
but I was wondering if there is a standard expected behavior
for PhD advisers that generally applies in my situation.

If my PhD adviser is unable/unwilling to fund my travel,
is it unreasonable for me to say that I cannot attend the conference?
(I estimate the total cost of attending the conference to be ~$1K.)

Update:
I asked my PhD adviser whether he could fund my conference travel,
and he said yes immediately.
One should always figure out the funding issues before submitting an abstract to a conference. Presenters withdrawing from a conference are a major headache to the conference organizers and it is unreasonable to expect them to reorganize the conference program because you did not figure out your travel plans (either timing or funding) in advanced. There are cases where there is nothing you can do (e.g., having a child), but in general when you submit an abstract you are committing yourself to presenting the work.

As to who should fund your travel, the best would have been to ask when you submitted to the conference. There really isn't a standard for who should pay. The first issue is to determine if your PhD advisor or Post Doc Advisor has money that could be used to pay for your travel. They would have to have money that could, if they desired, be used to fund your travel, and be willing to fund your travel.

I would ask both people and see what they say. No one is going to be offended by you asking. I wouldn't be surprised if both said no, but nor would I be surprised if both said yes.