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Re: My f350 just stops some times and is not getting fuel
Your fuel pump may be starting to go. The inertia swtich is just in case the truck gets hit. It shuts off the fuel flow. Could aslo be the fuel pump relay or computer power relay. I would check for fault codes stored in the computer. An auto store may scan for free.
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Have you been in any type of a wreck? If so the inertia switch is located in the circuit between the fuel pump relay and the electric fuel pump(s). If you have been in a significant impact the mechanism inside the switch will cause the switch to open the electrical circuit, shutting off power to the fuel pump as a safety precaution. The inertia switch is in the cab on drivers side, up against the firewall, to the left of the brake pedal or behind the right kick panel. I would suggest buying a new one because it is not something you can reset.
the power relay activates the PCM, engine computer. The PCM activates the fuel pump relay that turns on the fuel pump with key ON. It runs for 5 seconds, then it shuts off, unless the engine starts. Can you hear the pump run (hum) in th fuel tank when key is turned ON?
Also, reset the inertia switch in case it tripped. Owner's manual will tell you where it is. Rest is pressing the buton.
Yes. The switch is usually located around the passengers kickpanel. There should be an access hole to press the button on the switch. Sometimes the part is just above the carpet and sometimes you have to remove the kickpanel. If you are unable to find this switch on the passengers side,then look on the drivers side kickpanel.
Under the hood is a Powerbox. The shutoff switch (inertia switch) gets its power from the Fuel pump Relay after the Ignition is turned on. If resetting the shutoff switch does not help, your fuel pump Relay may be bad. On some Ford models, the horn Relay is the same Relay used for the fuel pump. This would allow you to swap and test before buying a new Relay.
Do you hear the pumps run when key is in the run position? There should be a relay for the fuel pumps. However check and see if you have spark, have your ignition module tested, most parts stores can test them. Also check the ignition switch and make sure it is operating properly and not needing to be replaced.
check for power to the pump first ,then if it has power check for earth ,could be immobilisor has cut in..when checking for power to pump use a seperate earth for the meter ,because if the immobilisor cuts in it stops the earth to the relay stopping it from working
OK, guessing you know your truck. Without a pressure switch the pumps would run all the time the ignition is on. do they run ok without pumping? (pull one out of the tank). Do you have a relay that the tank selector switch activates? Most cars run the hot lead active, and the pumps run by applying the return lines. Your problem could be in the wiring from the pump back to the negative.
SOUND LIKE THE ELECTRIC LOW PRESSURE FUEL PUMP CHECK FUSE TO SEE IF PUMP GETTING POWER. IF NOT REPLACE FUSE AND CHECK THE WIRE TO PUMP.IF PUMP IS GETTING POWER..REPLACE FUEL FILTER FIRST.IF IT DONT HELP.COULD BE THE ELECTRIC LOW PRESSURE PUMP. FAULTY. IT PUMPS DIESEL FUEL IT INTO INJECTION PUMP TO BE PRESSURIZED TIMED AND INJECT.SEE IF LOW PRESSURE PUMP DONT WORK THE WHOLE ENGINE WONT RUN.THE INJECTION PUMP NEED FUEL FROM LOW PRESSURE ELECTRIC PUMP TO RUN ENGINE.
It is fuel injected & what engine? They did use an Enertia switch on some , have you located that? I'll see if I can find normal location & get back, in meantime check near kick panels (by drivers left foot & passengers right foot) on drivers & passenger side, for a switch with a small push down to reset, button on top.