I experienced fuel pump failure in my 1995 Ford chassis motor home while on an extended trip to Florida. Cost me $1600+ to get back on the road and now my fuel guage shows full all the time.
I wrote to Ford Motor Co. asking for some help on the cost of repairs and received a reply that basically said "Tough s**t". They would not even discuss it!
The cost of a new fuel pump is about $300 and the big expense is the labor. I had a full tank (75 gal) of gas that had to be drained and stored. If you are not in an emergency situation, you probably can save a lot of the expense by shopping around for a mechanic, or do it yourself.
Additionally, I have a plan that I copied from the 'net' on how to eliminate the original pump with another which is mounted on the frame, outside the tank. If you are interested, I can e-mail it to you.
Regardless, if you are experiencing signs of failure, correct the problem now as it will surely get you at the most inopportune time.
If you don't know where you're going, any road you take will get you there!!!