no real need for a gauge...turn key on, do you hear pump whining? Leave key on, push the shrader valve (tire valve stem looking thing) on the rail...use a rag to protect your face. If it sprays all over, you're good on fuel. If not, it's the pump. I've only seen a couple pumps fail while driving...normally car just won't start in the morning. Once its pumping, usually keeps going until you shut it off.


Could be a cam/crank sensor as well...those will NORMALLY throw a code, try renting a obdII scanner from local autoparts store (if you have fuel and it still won't start)