Fuel rate flow problem-electric controled fuel

sounds like a fuel flow problem.Pull the fuel line off at the carb and see if fuel flows well when you turn the gas on.If the fuel is flowing to the carb,you will have to remove the float bowl off the bottom of the carb and check for fuel flow through the needle and seat which the float controls in the carb.If fuel flows well through the needle and seat and the float words well without binding, next is to clean the main jet which may be plugged.Ethanol in the fuel these days can cause problems in these areas.ALWAYS shut off the fuel in all small engines and let the carb run dry when storing small engines for any length of time.

I am thinking fuel pump first to check
inside on top of fuel tank turn ignition to on but do not start truck and listen for humming sound indicated pump is at least running. second disconnect fuel line and turn ignition on make sure fuel has a decent flow rate. second check for engine lights get a reading to make sure electrical system is working includes ignition. third check fuses and relays sometimes when vehicle starts but then after stalls can be controlled by an idle control circuit perhaps it is only a bad fuse or relay

ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........

• P0103
  Mass Air Flow Sensor Circuit High Input
• Possible causes
• Faulty mass air flow sensor
  - Intake air leaks
  - Dirty mass air flow sensor
  - Dirty mass air filter
  - Mass air flow sensor harness is open or shorted
  - Mass air flow sensor circuit poor electrical connection
• Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
• possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
  - Engine stall
  - Engine running rough
  - Excessive fuel consumption
  - Excessive smoke
• the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).

2003 NISSAN Altima Sedan OBDII Codes List

P1444 EVAP Canister Purge Volume Control Solenoid Valve
This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.

The fuel pump may need replaced. Unfortunately most newer vehicles have an electric pump located inside the gas tank so it's not a simple job to replace the pump. Please rate this answer, thanks.

I'm guessing fuel pump is going. Check for 40 PSI pressure with fuel pressure gauge. Check in engine comaprtment.
Section 10-01: Fuel Tank, Filters, Lines and Electric Fuel Pump 1995 Thunderbird, Cougar Workshop Manual
DESCRIPTION AND OPERATION Fuel Pump, Electric The electric fuel pump:

• Is part of the fuel pump module.
• Is located in an internal reservoir in the polyethylene fuel tank (9002) .
• Is mounted with its inlet at the bottom of the reservoir.
• Is designed to increase satisfactory pump operation during extreme vehicle maneuvers and steep climbs with low fuel levels.
• The high-pressure fuel pump module on the 3.8L SFI and 4.6L-2V engines can supply 60 liters (15.9 gal) of fuel per hour at a working pressure of 269.0 kPa (39 psi).
• The fuel pump module on the 3.8L SC SFI engine can supply 125 liters (29.0 gal) at the same rate and pressure.
• The fuel pump module has an internal check valve to maintain pressure in the system after the engine is shut down.
• The fuel pump module also has an internal release valve to provide protection from too much pressure if fuel flow becomes clogged in the fuel filter (9155) , the fuel line is damaged, or other factors.
• Overpressure is limited to 850 kPa (123 psi) and reduced fuel flow will result if the pressure relief valve is activated.
• The fuel pump module is protected at its inlet by a nylon fuel filter element (9365) which filters contaminants which could plug or damage fuel pump components.
• The fuel filter element simultaneously allows passage of small quantities of water which may accumulate within the tank reservoir.
• The electrical system has a fuel pump control relay in the powertrain control module (PCM) (12A650) which provides power to the fuel pump module through an inertia fuel shutoff switch (IFS switch) (9341) that is normally closed.
• The electrical system provides power to the fuel pump module through two relays:
  • Fuel pump power relay.
  • PCM power relay.

The current path depends on operating conditions.

• When the ignition switch (11572) is OFF, contacts of both relays are open.
• When the ignition switch is first turned to RUN, the PCM power relay energizes and closes its contacts.
• Power is sent to the fuel pump relay and a timing device in the powertrain control module .
• The fuel pump module runs through the contacts of the fuel pump relay.
• If ignition switch is not turned to START, the timing device in the powertrain control module will open ground Circuit 57 after about a second.
• Opening the ground circuit deenergizes the fuel pump relay, which opens its contacts and de-energizes the fuel pump.
• The circuitry provides pre-pressurization of the fuel system.
• When the ignition switch is turned to START, the powertrain control module operates the fuel pump relay to provide fuel while cranking.
• After the engine starts and the ignition switch is ON, power to the fuel pump module is again supplied through the fuel pump relay. The powertrain control module senses engine speed and shuts the fuel pump module OFF by opening the ground circuit to the fuel pump relay when the engine stops or is below 120 rpm.

Are you using the stock mechanical fuel pump or an electrical one?

If it's an electrical then you may install one with too much psi and gpm/gph flow rate.

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The other potential case is stuck fuel float or miss adjusted angle on the flow arm.

can you hear the fuel pump running in the gas tank when you first turn the key to the run position?

try your O-2 sensor,some models have a an electric plate underneath the coil pack,those have been known to go bad,be it out with a blink or fade away.hope this helps

This injector set-up needs a specific fuel pressure supplied to the fuel rail to even start, much less run properly. The fuel pump is immersed in fuel inside the gas tank to keep it cool and not burn up. Running the fuel level low causes more heat in the pump and interuptions in proper fuel pressure. AC/Delco pumps have proven to be a reliable fix, the aftermarket pumps only last for a month or two sometimes. Check fuel pressure under the hood and power and ground to fuel pump at electrical harness at top of gas tank. This truck needs a fuel pump.