I call them a "wall fish tape".  https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1BOFA_enUS494US494&ion=1&espv=2&ie=UTF-8#q=wall fish tape

A small sink snake would work too I think.  They have some new styled plastic ones that are just a few dollars.

 

2 hours ago, madkaw said:

90 psi on a sealed fuel tank? Might try a bit less at first- IMHO

Removing the gas cap unseals the tank.

All:

Thanks for your replies.  I think I got it last night.  I chucked' a piece of 3/16" braided stainless cable in my cordless drill and ran it through the fuel pickup at low speed.  I can blow air into the tank pretty easily so I think the blockage is clear.  I'll find out for sure this weekend.