Fusable link location

USA only answers, I do not do non USA OBD2, ever.
the OBD2 port has a power pin 12vdc, and the fuse is blown
we replace the fuse
the hand tool has battery do not be fooled by said batttery.
the ODB2 port 16 pins total, and pin #16is power 12vdc,
some old (all) scan tools do not work on newer cars at all.
the secret here is missing pins on scan tool (wow).
1996 tools being the worst (have some too, have many tools)
The radio fuse is bad. (we always check fuses first)
no power no joy and no free energy,
the true wiring diagram is called a factory service manual.
can also be seen at mitchells DIY
$20 and its all there to read, vast info.

https://eautorepair.net/Marketing/Default.asp

this is not spam it is FACTs (best data lowest cost)

Easier to pull the fuel pump relay, and with a test light or voltmeter check the relay terminals for a power signal. If the power feed for the pump is a fusible link, likely it is a hot at all times power source. One relay terminal will then show power at all times.
You can also check for the relay's on signal from the computer. When the engine is cranking, the relay should have two hot terminals-the power feed for the pump and the computer signal to energize the relay.
Another way is to check for power at the fuel pump connector while the engine is being cranked over. If there is power then, you know the pump has to be taken out for inspection or replacement.

Be very safe when you work with fuel and electricity. Only work with live wires when you are trying to measure their voltage. If fuel leaks then don't work with it until all the fuel vapor is gone. The first to do when you work on a vehicle is to disconnect the negative terminal on the battery.

There must be 12V to the pump for it to pump. If power is to the pump and the pump does not run then the fuel pump and fuel filter need to be replace. If no 12 V is to the pump then you have an electrical problem. Sometimes the pump motor fails or a wire shorts to ground. Either of these can cause a fusable link to blow. If a fusable link is blown you should disconnect the wires to the fuel pump. Next replace the fusable link and if it blows right away then the wires are shorted to ground somewhere. If you now have 12 volts to the wires you disconnected then disconnect the negative terminal of the battery and connect the wires to the pump. With the battery connected and you get fuel pressure then the engine should start. If you get no fuel pressure then the pump needs to be replaced along with the fuel filter.

I hope this helps.

Starter is bad check connections at battery n starter if their good u need a new starter motor

Confused as to why you are replacing things that crank the engine over, like the starter, and things that are just for fuel, like the pump?

Can't tell if it is cranking over or just not firing?

But if it is not cranking, then consider the ignition switch, neutral safety switch, engine ground strap, and battery terminals.

If you think it is not getting fuel, then try some starting fluid, to make sure it does spark at least.

If it does have spark and cranks, then you should put a gauge on the fuel rail. If there is no pressure when you try to start, then check voltage at the pump with a test light.
If none, then follow back to relay.
If none there, then try jumping at the relay, just for testing.
If that works, then it could be safety cutout system.
Some vehicles use an inertial switch, some use oil pressure switch, some use alternator feedback.

The fuel gauge is probably fine, its the sending unit that is probably bad. As far as the radio I would run another power wire from 1 of the accessory ports on the fuse box. Just make sure you test the port so it goes on and off with your ignition. Just test the port with a light tester. Please rate answer!! Thank you

Hi,

Before anything, Check the battery and let me know, if that is Fine.What is the Voltage you could measure?

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

there should be a relay to the fuel pump....sometimes located under the hood by the firewall.......try looking for it......"that one might run two both of them"....

in case of the ignition have you checked the inginition key cylinder.....? does it move alright......can you try to crank it and will it give you power to run the radio?

you have to put a guage on it to find out the pressure it may kick on but not enough pressure

I come to find out,the fuel command is controlled by the computer, due to corrosion in the internals, it is not telling the fuel pump to turn on,so in turn, I run a switch to the power side of the fuell pump, it works, but the weird thing is, you only need the power on to start the truck, after its running, you can shut the switch off, it stays running, shut it off, you need to turn the power on to make it start pumping again, now who can explain this??