I use a Craftsman strap wrench that I got for Christmas a few years ago. Clean the area where strap goes around the filter to prevent slippage. I've also used a pair of large adjustable pliers (sometimes called water pump pliers) to get a better grip and break it loose.
If all else fails, drive a large screwdriver through the filter and use that for leverage. It's a messy alternative. Residual fuel pressure is not what's holding the filter tight.
If you don't have a primer pump, plug the center hole in the filter and prefill the filter thru the smaller holes. When the engine starts, hold it at a fast idle, to purge whatever air is left in the system.
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Denny, Connie & Shadow (former barn cat made good)
2000 Itasca Horizon, Cat 3126B, Freightliner Chassis
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