Fuel pumps not turning on 1990 f250

Sorry this vehicle does not have a fuel shut off switch or inertia switch > that's ford ! If you pour fuel in the throttle body an it runs It's something with the fuel system , an if you replaced the pump an filter an regulator , It has to be electrical ! did you check voltage at the fuel pump relay ? What engine does yours have , 2.5 , 3.3 L ? There is a in line fuse for the fuel pump near the relay ! There are four relays front right of engine compartment mounted on radiator support cross member . The one for fuel pump is the one on the inside . Fuse is near there an there is a connector not connected to anything ,this is for fuel pump prime . Jump battery voltage to it a see if it runs then ! or replace relay !

Fuel pump relay is behind the radio to the left. This is inside the dash board towards the drivers side. The fuel pump inertia shut off switch is in the passenger side front kick panel. Check for power at both sources before checking at the pump itself. It might save having to drop the tank.

If you don't hear the pump running, it's likely not the fuel filter. However, you'll need to determine if the pump is getting power when it will not start. There should be a fuel pump inertia switch identified in the owner's manual. It's likely near the passenger side kick panel inside the truck. This is typically a convenient place to check for voltage from the fuel pump relay to make sure voltage is getting to and through the switch. There have been a fair number of folks that have had issues with the inertia switch failing. If you have voltage through the switch for about a second after the ignition switch is first turned to the Run or Start position, then you need to find out if the power is making it to the fuel pump. If there is no voltage to the inertia switch immediately after they key is turned to Run/Start, then you need to work towards the battery.

-Rod

The Fuel pump relay for this vehicle is not removable, not smart on Ford's part. What I used to do is disconnect the fuel inertia switch which is located right next to the fuse panel on the passenger side lower kick panel, closest to the firewall. It's tough to get to but can be done. I've seen guys take the inertia switch to pop it then reset it when ready but I'd recommend just disconnecting the connector, and run the engine til it stalls, replace the filter then reinstall connector. The filter can be disconnected without disconnecting the switch by using the fuel clip tool and slowly pulling the line off, allowing pressure to drop but this should be done by an experienced person wearing safety glasses only.

Disconnecting the inertia switch and running the engine til stall could throw a diagnostic code/engine lamp but this can simply be erased by disconnecting the negative battery terminal for 5 minutes. Good luck, please ask if more help is needed.

Check with your parts man and see if your Year model uses a ECM Relay. There is a fusible link and an Inertia sensor too.. The inertia sensor is either in the area of the passenger kick panel ( may have access hole) or the drivers kick panel (may have hole). Either side you need to push button on the switch to reset fuelpump.

If that does not help I understand a fusable link is either feeding the Inertia switch or the ECM Relay.

You need to change the fuel pump.

Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
the fuse to the fuel pump relay.
The fuel pump relay to the fuel inertia switch
The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.



If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
Press the button on the top of the fuel inertia switch, and check for power leaving the fuel inertia switch on the pink w/ black stripe wire.

This is tests good, check for power at the fuel pump, same pink w/ black stripe wire.
Fuel inertia switch info is in the owners manual, If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

change your fuel filter. re-test

Make sure it is getting gas; check the fuel filter and fuel pump and any fuel pump relays. If it is fuel injected make sure your getting current to the injectors and check the relay. You might also want to check the starter solenoid and your ignition wires, distributor, distributor cap, rotor, etc... You don't say if this problem occurred suddenly or if it's been an ongoing.

check whether you r getting sparks at ignition switch.
also check the fuel pump.
thanks.