Q: Q: Fuel pressure

asked by on

My first check I was told my 02 sensors where too lean I replaced all 4 of those no change the cat on my right side rear turned red sent to shop to replace not clogged and or bad replaced almost all sensors pcv mas air flow throttle body and all problem still sent to dealership for a deeper check to find out my fuel pump is putting out 9 psi and my truck needs 45psi could it be the pressure sensor on the full pump that is bad and not the sending unit had checked at first shop i was told I'm getting gas I have a 5.4v8 Triton 4wd

My car has 185000 miles.
My car has an automatic transmission.

There are a number of things that may cause low fuel pressure such as a weak fuel pump, clogged fuel lines, clogged fuel filter or a bad fuel pressure regulator. This can happen when the pump itself is not working properly or when the fuel pressure regulator is not maintaining the proper fuel pressure in the fuel system causing the engine to starve for fuel. This can also happen when there is insufficient connectivity to the fuel injectors which can cause an intermittent fuel spray pattern into the intake system resulting in a lean fuel condition or the motor otherwise starving for fuel. I would recommend having an expert from YourMechanic come to your location to diagnose your fuel system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Fuel pressure

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car chokes when accelerating and when at a stop

Hi Nadia. The check engine light can come on for many different reasons. However, I believe your light is related to the symptom you've described. A catalyst problem wouldn't likely surface as this particular symptom. When you say the vehicle...

Q: I have a 1999 expedition,how many catalytic converters would it have?

Since this vehicle has a v-shaped engine, there would be two Banks of exhaust. Typically for each Bank of exhaust there is one catalytic converter. Therefore there should be two catalytic converters total on the entire vehicle.

Q: Cranking noises when I am turning on my car.

The problem may be the replacement starter itself or the transmission flex plate the starter drives to start the engine. If there was damage to the gear on the old starter, some of that damage may have transferred to the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...