Taurus Stalling - 99,000 miles, 3.0L, 2V group
I have been trying to isolatean ongoingstalling problems. What I have recently found out is that these problem happen almost exclusively when the gas tank has less than 1/4 tank of gas. The car
will stall out at stop lights, it will just suddenly just turn off. It will also stall more often when driving at hwy speeds. When the car has 1/2 tank or more of gas, it does not happen. This leads me to think it's a fuel pump, fuel filter problem, or crud in the tank getting sucked into the pump or filter stopping the flow of fuel.
I have been running my Autoxray 5000 scanner, watching the real time, fuel
rail pressure, while driving with less than a 1/4 tank. I have seen the pressure vary from 65 psi (highest at idle) to more of driving average of 36 to 42 psi. I always thought the fuel pressure should stay pretty constant while the engine was running (possible symptom).
Now I did experience stalling at a stop light, what confused me was that the scanner lost it's connection to the computer when the car stalled, which lead me to think it's an electrical problem. But why would an electrical problem only happen when I have less than 1/4 tank of gas? The only thing I can thank is that when the car stalls due to a lack of fuel, the computer resets causing a loss of connection to my scanner. This may be why it's so hard to find the codes or see if the fuel rail pressure drops to zero due to a failing fuel pump, or clogged fuel filter
I am going to try a test by hooking up the scanner, starting the car, then pulling the fuel pump
fuse to see if I can replicate the stall. I will look to see if the computer resets during the stall and I lose the scanner connection. If it does, I will replace the fuel filter, and fuel pump.
* If anyone knows if the computer resets at a complete engine
stall please reply.
* If you are having the stalling problem check to see how much fuel you have in the gas
tank when it happens. if it's below 1/4 tank please reply.
* If you have been scanning the car and see the same loss of connection when the stalling happens please reply.
I will provide everyone with the results once the "pull the fuse" test is complete.