A good mechanical fuel pump must pass three tests- - - -volume, pressure, and vacuum. I've been preaching that gospel for 20-something years on this site, and to the best of my knowledge, nobody has ever followed the proper testing procedure on a fuel pump. I've given up on even trying to pass that knowledge on!
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!