Question

My 1995 Lincoln Town Car will not start the first thing in the morning. The engine cranks but will not turn over. I have replaced the gas filter. After I spray starting fluid, it will start and will continue to start for the rest of the day. When I dropped it off at the Mechanics, it started two day in a row. Now for three days in a row I am back to the old problem. It won't start
again. The Mechanic said that in order to find the problem, he needed it to be on his property
and not start, so that then they could diagnose what is the problem. One of my questions is
do I have to have it not start to truly diagnose the problem? My mechanic said a possible
expensive solution would be a fuel pump. Special Note: the car has 150,000 miles and this
problem has been consistent happening occasionally during the past year, but the car seems
to periodically fix itself and starts for a month or two. Need a lincoln town car expert to answer this problem.