I recently had to replace the fuel pump on my 92 GMC Yukon.  2 years
ago I replaced the fuel tank, and it was truly a miserable job.  Yeah,
should have replaced the pump then!

Newer vehicles sometimes have a access panel in the rear floor so the
pump can be replaced without dropping the fuel tank. I decided I
wanted one, so I carefully sized and cut a rectangular section out,
replaced the pump and reconstructed the floor as a panel I could open
again if really needed..

Pictures are better than words for this, so if you're interested, take
a look at:
http://terryking.us/photoalbum/v/SHD/yukon-fuelpump/

OTHER DATA:  A new pump has a resistance of 11 Ohms.  The 'bad' pump,
with 140,000 miles on it, had a resistance of 60 to 70 ohms (probably
worn-out brushes)..   Perhaps an occasional checkup on your older
truck would include measuring the pump resistance.  I think this pump
was slowly dying for a while... I had a funny light-throttle surging
problem that went away with the new pump..

Thanks for the help I've gotten in the past here and across he Net!

Regards, Terry King  ..In The Woods In Vermont
terry@terryking.us