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If you are positive it is the fuel not reaching the engine, replace the fuel filter. Next after doing a quick Google search on your model, it seems the fuel pump relay can be an issue with this model. Have the relay tested or depending on cost, replaced.
Check for broken, loose, or disconnected wires to your PGM-F1 and ignition unit. If there's none, check for the functionality of these control units. Check also if your camshaft position sensor works. You may also want to check your spark plugs gaps, fuel filter, pump, and fuel lines.
Fuel pump relay is fine but are you not getting fuel still? If this is the case and I'm not sure of the model you have but since you say it's a 2.5 I'm going to guess at the TL. If this is the case there is also a fuse for the fuel pump. That fuse is located in the interior fuse box. It will be in the number 15 position (see picture of layout below). I am assuming fuel is the issue but if your not sure, check to see if you're getting spark to the spark plugs. If not you are in a whole different area. Not sure if this helps you but I hope it does. You can reply to this and I should recieve an email letting me know if you have any questions. you can always email me at firstname.lastname@example.org just let me know the model and year so I know for sure. Good luck!
You will have to have a fuel pressure test done on the vehicle ,but it is either the fuel filter,or the fuel pump witch has gone out,it is not a relay,or fuse,or the pump would not work at all.Replace the fuel filter and see if the engine performs correctly .If the fuel filter helps,but the engine still runs poorly,replace the fuel pump,if the fuel filter went to long,being restricted,it will wear out the fuel pump.
hi, when you turn the ignition on do you hear the fuel pump start up if you do then the pump is fine if how ever you hear nothing then the chances are its going to either be the fuel pump or fuel pump relay, if you have a look in your fuse box you should be able to find the fuel pump relay if you cant locate it then its best you get a manual to show you the relays location, you can then put a finger on the relay and when you turn the ignition on you should feel a little click coming from the relay if you hear this then the pump needs replacing but if you hear or feel nothing then the chances are the relay needs replacing.
you can also check if the pump is working by removing the fuel feed hose from the injector fuel rail then once this is removed you put a tub under it then turn the ignition on if you have fuel shooting out then you know the fuel pump and relay are ok and you need to start thinking of some other problem such as ecu etc,
see what you find then get back to me and ill try and assist you further ok
for you to check if it is the fuel pump, see if there is fuel running out of the hose if you remove the fuel filter. Another is to directly connect the pump to the battery. If the pump works that way, then it could be a efi relay issue which is found underneath the dash or a wiring issue.
Make sure yu can hear your fuel pump run when you first turn on your key. If not check fuel pump fuse and relay for power. If your relay is working and your fuses are good it is most probably your fuel pump or fuel filter, the fuel filter is not expensive. If you can't hear it run and everythinng else checks out it is your pump! i hope this helps Merry christmas!