Gas Leak.. fuel line repair cost

I'm am starting to majorly worry about my 95 Millenia (base model with leather) and the Gas leak I discovered 2 days ago... I drove up the road to a Napa place close to home Thurs. morning and they've had it all day. I was thinking it was the fuel filter, but they confirmed it's the fuel line. Well they had quoted $150 for a fuel filter change... I've never had a fuel line replaced on this car, but know the parts to be around $20. How much should this repair cost? Thanks! Jon BTW - I have also had problems with incessant "check engine light", fuel sensor or gas gauge, eating of tires and oil leaks... The car drives fine, but better gas mileage and the above problems resolved would be nice. I HAVE put a lot of miles on it (10k) the last 6 months and I'm at about 99500 miles.

Jon, I just had Jiffy Lube service my '98 Millenia here in Tampa. They offered to change my fuel filter 4x. They have a special on a fuel package which included the filter for way under $50. That might be an option for you, instead of that $150 hit. best, Paul