Buzzing under back seat Type 44

[Adam Jansen]

--
[ Picked text/plain from multipart/alternative ]
Greetings fellow listers-

Ever since I bought my 87 5KCSQ there has been a low buzzing under the back=
 seat (outside car).
What is causing that?  Is it the fuel pump?  Should it making that much noi=
se?

Reason I ask is that for the third time in a week that buzzing sound change=
d pitch (got higher and MUCH louder) and then the car started running reall=
y rough, like it was starved for gas.  If I turn the car off and back on, i=
t runs fine...  Do I need to replace my fuel pump??

Thanks for the help
Adam
Olympia, WA
87 5KCSQ
238,000 and climbing