Fuel pumps must not run with just the ignition switch on. To do so would create a serious fire hazard if a fuel line got ruptured in a crash. They will run for about one second when the ignition switch is turned on to insure pressure is up for starting, but after that, they only run when the Engine Computer sees engine rotation, (cranking or running).
The clue you need to address is the immediate loss of pressure after that one-second spurt. That pressure can be expected to hold for weeks on some cars, but at least a few minutes on all cars. Even with a leaking fuel injector, it will take some time to lose all pressure. To be lost instantly, the most likely suspect is a leaking fuel pressure regulator or the o-ring on its nipple. I think your regulator is on the fuel rail on the engine. If it is, there will be a fuel return hose going back to the tank. Use a pinch-off pliers to pinch that hose. If pressure holds, the regulator is leaking or the o-ring is cut. That loss of pressure will cause a long crank time to start the engine. The injectors are bleeding off pressure while it's trying to build up, and the battery voltage is drawn down during cranking so the fuel pump runs slower than normal.
Friday, October 3rd, 2014 AT 12:00 AM