99 Honda CRV occasionally won't start

Every once in a while after my car hasn't been running for a few hours, it wont start. It turns over fine, the battery is new but it usually takes being jumped and I have to pump the gas to get it to start. If that doesn't work it usually always starts the next day.

I'm thinking its the fuel pump but is there anything else it could be?
Please help! Thanks.

I've seen these same symptoms from a clogged fuel filter. They are easy to replace and I recommend trying this first. Fuel pumps seem to either work or not, but I've never heard of a weak one. If you replace the filter, be sure to install the copper washers properly and really, really, tighten the nuts.