Try removing the fuel pump, and/or use a long screwdriver or a broomstick like a stethoscope. It's not uncommon for fuel pump linkage to get worn and rattle.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!