F-150 ford truck check engine light keeps coming on

P0191 - Fuel Rail Pressure Sensor A Circuit Range/Performance , Description: The comprehensive component monitor (CCM) checks the fuel rail pressure (FRP) sensor for an acceptable fuel pressure. The test fails when the fuel pressure falls below or exceeds a minimum/maximum calibrated value for a calibrated period of time. Possible Causes:

• High fuel pressure
• Low fuel pressure
• Damaged FRP sensor
• Excessive resistance in the circuit
• Vacuum leaks
• Low or no fuel

Diagnostic Aids: A FRP PID value during key ON, engine running of 138 kPa (20 psi) to 413 kPa (60 psi) is acceptable. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test DD .

I had a similar problem that turned out to be dirt contaminated gasoline. The "fix" was always to replace the fuel filter but it would not stay fixed. In particular, each time I started having problems it was after I let the gas tank level get low.

What I did that you can consider was:

1. But a new fuel filter.
2. Get a 5 gallon gas can.filled with fresh gas.
3. Get some cheap gasoline proof container (or several containers) for waste gasoline.
4. Make a "vacuum cleaner" out of an electric in-line low pressure gas pump, some low pressure gas hose, and a couple of pieces of copper tube, 20 ft of two conductor wire, and two alligator clips. It connects hydraulically copper tube to suck out the gas tank, fuel hose, pump, fuel hose, copper tube to go into the gas can. The wire and clips are to hook the fuel pump to your car battery.
5. Drive the car until the fuel level is low.
6. Remove the fuel pump module.
7. Vacuum the gas tank into the waste gas container through the opening left by the fuel module. Try to get the dirt off the bottom.
8. When you have vacuumed all you can get, stop awhile and let the dirt settle in the waste container.
9. Vacuum the gasoline from the waste container back into the gas tank. Vacuum high in the container so the dirt stays in the waste. Try to wash any dirt in the gas tank to below the fuel module opening.
10. Stop a while and let the dirt settle.
11. Repeat vacuuming and washing as many times as needed to get the tank clean and empty.
12. Inspect the tank interior with a mirror and flashlight looking for rust, dirt, etc.
13. Replace the fuel module.
14. Install the new fuel filter.
15. Pour in the new gasoline.

And hopefully you are good to go.

It varies for every car. Usually 1-1.5 gallons when the low fuel light comes on. I drove my last '93 Ford Taurus around until the gauge said it was empty. Lifted the car and took the gas tank off and it had 3 or more gallons still in it. Here's some fun, zero your odometer, fill the gas tank and drive it until the low fuel light comes on. Then drive it till it dies out, obviously somewhere near home or where someone can drop off a full gas can.

No check engine light? I would have a ford dealer do a diagnostic scan and tell you the results. It will cost.

Take it to your nearest Autozone they will hook up a code reader for free and give you an idea what turned on your check engine light.

check whether you have air sucked by the engine,or stepper motor if is fitted not working or dirty throttle body.

New Spark Plugs--every 70,000 miles
Clean MAF Sensor
New O2 Sensors--100,000 miles
Fuel Filter-every 3 years

Check TPS Sensor for opens

when it's on go to autozone & have them read codes.

The wrench light reports issues that the normal check engine light doesn't and you may need the dealer to read those codes with thei special equipment.

Is the service engine light on? If so, check with you local auto parts store....most will scan the code free or loan you a scanner in their parking lot.

I had a simailar problem with my 2006 F-150 Brakes and this was after bringing it in for the recall mentioned above ( Recall 08505) The brakes were good until I had about 34K miles and then one day
the brakes started to grind and screach when applying brakes at low speed. As the above reader had stated, No warning! I do not understand in a day of high technology that ford does not have a senson that indicated your brake pads have worn out. This truck has been a pain in the 2 years of ownership, it has been in the service department for a transmisssion problem ( 4x4 Transfer motor replaced)
power stearing pump replaced and the recall, now the brake issue. Now I know why more guys are going to Toyota or Nissan Full Size Trucks. This is my last Ford Truck!