If an engine won't idle for 30 seconds on the gas in the float chamber, even if you have to fill it through the vent tube, you've got a lot more problems than just a weak fuel pump.

The volume check is part of a 3-part test which also includes checking pump pressure and vacuum, and yes, all of them are done with the engine idling. Anyone who is unable or unwilling to do it safely needs to sell his truck and his tool box on Ebay and take up knitting as a hobby.
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!