1999 Pontiac Montana cranks but won't start

Cranks but No Start:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.

thanks for all your help and it did help turned out to be the ingnition moduel was dead.thanks again.now I have another question the fue pump is only working if i wire it hot.it works good when running plenty of preasure just have to wire it hot

When the engine starts the fuel pump and oil pressure sending unit powers the fuel pump constantly,check into it-