I just happened upon this listing a few days ago, for the exact same reason:

http://item.express.ebay.com/Home-Ga...mdZExpressItem

Odds are, that's not going to work. Search on "Poulan primer bulb" on
ebay, and you'll find quite a few listings, all pretty much the same
thing. OEM. Some listings have really steep shipping, and some have
$2.47 shipping, so shop a bit.

Here's a tinyurl to the same listing: http://tinyurl.com/ysnr2b
(Some people don't trust tinyurl's...)

Mitch wrote:
I went to use my weedeater for the first time this season, and the
priming bulb has lost its spring. It doesn't pop back out, so I can't
prime the engine.