almost done putting motor in XCV70 2.4 turbo, new platinum plugs, good coil packs, new fuel injectors, new fuel filter, fresh gas. runs smooth, but has to crank over a lot to start. My crankshaft sensor is not tight, bolt stripped, could that be the cause, or what else should I look at. I cleaned the throttle body before I installed it. thank you.

 

also notice when relieve fuel pressure valve on fuel rail, no fuel comes out. could it be pressure regulator or weak fuel pump?

 

It could be a weak regulator. Have you tried to get a fuel pressure gauge and get a reading ??
Have you checked the vacuum line at the regulator to see if the regulators nipple seeps fuel or the vac hose has a strong smell of fuel indicating a ripped diaphragm in the regulator ??