Why do they clog frequently. We've cleaned the whole fuel system and injecters et al. Seems like once a year the filter needs replaced. Other than that, she's a gem and is running perfectly! She's 36!

 

fuel filters don't normally clog, it's a sign that the car sat for a long period of not being driven or got a bunch of junk in the tank somehow.

 

My mom didn't drive it as much the last year or so before she died ... I'm sure your right. My dad redid the fuel system... ty! For replying.

 

So you have a 1981 fuel-injected car...or a carbureted car? Not up on FB's, but was thinking they all had carbs that year.
Either way as you said it's 36 years old. A lot years for varnish other contaminants to collect. Fuel filters aren't expensive and IIRC they're not hard to change on that car. I'd imagine the fuel injectors might be a little more sensitive. Are the filters actually 'clogging'? If so, you might want to look into pulling the tank and have it cleaned/flushed. If not and the filter is just looking nasty, then once a year doesn't seem like too big of a deal and intervals may improve over time.