You did not provide enough information. what happens when you try to start it? Do you have power to anything? did you try to jump start it? If the power is ok, or you tried to jump start it and still nothing happened, chances are its the starter relay located in the fuse panel under the hood.
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Sudden no starts are usually gas or ignition spark related. You could check for spark on a spark plug wire OR you could spray a shot of starting fluid into the air intake, and then try starting-if the engine fires up briefly, then you know it is a fuel problem-maybe the pump or the filter or an injector circuit problem. The fuel pump should turn on for a couple of seconds when turning the key to on, not start. This puts fuel pressure in the line and at the injectors. If you have gas up to the engine under pressure, the pump is working. You should still have the fuel pressure checked to make sure it is at the correct pressure for your vehicle-a worn tired pump may not be doing good enough.
If the starting fluid causes not a peep from the engine, check for spark. If no spark, the ignition system will need diagnosing. It could be a fuse or an ignition part failed-the coils, the ignition control module, the crank position sensor (for timing of the spark), the ecu, etc.
Check the wiring from the ignition switch . When you got fuel as the engine was cranking then the power for the pump is on the start side of the ignition switch and not in conjunction with the run side of the switch.. IT could be a fuse in the run circuit or a faulty pump relay.
Make sure that you have enough gas in your car.
This sounds like common sense but many people don't think to check
this before wondering why their car won't start. Try to refill your
tank when it is no less than one quarter full, or you risk getting
stalled or stuck somewhere.
Verify that the battery has a
full charge. A battery with a low or partial charge can cause the
engine to crank too slow preventing it from starting. Sometimes a jump
will fix this problem, but if your battery is more than five years old
you should consider replacing it, especially if winter is only a few
Check to see if your fuel pump
is turning on. This can easily be done by putting your key in the
ignition, turning it to the "on" position, and listening carefully with
your ear pointed toward the back seat. If your fuel pump is working you
will here an electric "whirring" noise for about 2 seconds every time
you cycle the key on and off. If you hear nothing then your fuel pump
is faulty or not getting any power.
Find out if the engine is
getting gas to it. Sometimes a plugged fuel filter or a problem with
the fuel injectors can prevent the engine from getting any gasoline. To
check this remove the air cleaner and smell inside the throttle body or
air cleaner housing. If the engine is getting enough gas you should be
able to sense a strong gasoline smell due to the amount of uncombusted
fuel left inside the intake manifold.
Determine whether the spark
plugs are firing. If there is plenty of gas but no spark, the engine
will crank but not start. Unplug one of the spark plug wires and plug
in a spark tester. Have a friend get in the car and crank the engine
while you watch to see if the spark tester illuminates. You can usually
purchase a spark tester at an auto parts store for about ten dollars.
Find the fuse box of your Ford
F-150, located on the passenger side of the truck under the dashboard.
Locate the fuel reset switch that is next to the fuse box with a red cap
Start the motor of your vehicle
and then depress the red cap by hand at the top of the fuel reset
switch to stop the flow of fuel to the engine. Once the engine dies,
crank the motor a couple of times to drain all the fuel pressure from
Locate the fuel filter on the
inside of the frame rail under the driver's side door. Notice the
markings on the fuel filter and how it is pointing, so you can identify
which way to install the new filter.
Disconnect the metal retaining
clip by hand from the front (engine) side of the fuel filter and move it
out of the way. Compress the metal fitting that sits over the front of
the fuel filter with a line-removal tool until the filter comes loose,
then separate the line from the filter.
Separate the rear of the fuel
filter from the fuel line by carefully using the line-removal tool to
compress the metal fitting until it come loose, then remove the filter
from the line.
Use a flat-head screwdriver to
loosen the clamps holding the fuel filter in place. Slide the old filter
out of the clamps and discard the filter.
Slide the new filter into the
clamps with the arrows on the filter pointing toward the engine and
tighten the clamp with a screwdriver. Connect the front fuel line to the
front of the fuel filter by sliding the compression ring back and
placing the line over the filter until the ring snaps into place, then
move the locking clip into place.
Connect the fuel line that runs
to the fuel tank by pulling back on the compression ring and sliding the
fuel line over the filter until the ring snaps into place, then move
the blue locking clip in place over the line.
Check all your connections to
verify that they are set right and then depress the red fuel pump
inertia switch. Turn the engine over by turning the key without starting
the engine and counting to 10.
Check the fuel line again to verify that there are no leaks. Start the motor and allow it to run until the idle smooths out.
check if the input side of the fuel pump has a restriction . a perished rubber hose can be a problem , the pump should be able reach a pressure 35 psi + and a flow of a quart every 30 seconds at this pressure.
Very likely a dead fuel pump...but start with the easy/cheap stuff first: Check for pressure at the fuel rail, if none, then check fuses and relays and harness plug-in at gas tank. Next, move to the fuel filter and replace (once you have the old one out, you might as well put a fresh one back in). If you have metered the fuel pump wire at the plug in harness, and you have momentary 12 v, then you likely have a bad pump. To eliminate other possible ignition problems, shoot a shot of spray start in the intake. If it fires up, replace the fuel pump.
It sounds like you are talking about a diesel engine as gas engines are self priming. Lift pump or primer pump may be defective. Check for loose fittings or lines and damaged o-rings at filter housing. Sounds like you are sucking air somewhere.
Look on passenger side frame rail ahead of the rear wheel in a bracket with a fuel line on each end. Before starting replacement-- be sure to release pressure from fuel lines, by removing fuel pump fuse under hood and running engine to use gas from lines. I then remove fuel lines by moving clamps away from fitting so hose can be pulled loose from old filter while it is still in bracket. On top of mounting is a bolt that holds filter clamp in place . After removing clamp and filter from mounting bracket, loosen filter body clamp and slip oout old filter-- then in with the new filter. Then reverse your steps to install filter. After filter is back in place -- reinstall fuel pump fuse, turn on key for a few seconds for gas to refill lines, then start engine and check your installation to make sure you have no fuel leaks at line connections.