Make sure the pump is turning. Pressure going to zero suddenly doesn't make sense. Have you dismantled the pump to see if the gears are intact? Also check the distributor for damage to the drive tang.
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!