I don't think you can get a decent clicker type torque wrench for anywhere near $80. I would consider $180 an economy model. Do not buy them at yard sales. Periodically, they need to be re-calibrated and that alone costs a major bundle partly because of postage. No one local does it. Also, they tend not to be accurate below abround 20lbs.
A Sears beam type that goes up to around 50lb is perfect.
In my humble opinion, if you pay more than $1.29 for a fuel filter- you paid too much.
As long as you're measuring the gas line, just take the whole thing to the store. Your filter fitting should press in tight and neer leak. You may need to cut about an inch out to compensate for the filter.