How to chck a fuel pump

check the wires going to the fuelpump if thats all good check the fuel filterit maybe blocked if so say good by to that new fuelpump

For the 1998 s10 theres no fuelpump switch, there is a fuelpump relay. the relay is in the engine compartment inside the fuse/relay box. the relay will be labeled on the inside cover of the fuse/relay box cover. besides the relay the only other problem for a fuelpump not working on these trucks is the fuelpump is bad or the wiring connector to the pump is bad.

First check the fuse for the fuel pump, listed in the manual and also on the lid to the fuse box. Then check for power going to the pump, if there is power and no pumping, then the pump needs replaced. The pump is located in the fuel tank and you will have to drop the tank to get to it. The come out easy and replace easy, just getting the tank dropped is the bear. No resets that I am aware of and I been doing this for quite a while now.
It is possible that when it rolled over a wire got torn loose on the underside of the truck and this could be the problem.

Alot of times a bad fuelpump will run with the extra voltage not often but sometimes, i would check the power voltage and ground at the fuelpump, this is the only way to know for sure, if you get 12 volts and have a good ground at the fuelpump then i would say the pump is bad, check all wires going to the battery, make sure there are no loose wires or connections at battery terminals and try changing the fuelpump relay with another one and see if that helps, a bad relay can also cause this, good luck.

With ignition key on run, use test light to verify you have positive & ground to fuelpump. No power (positive) check fuelpump fuse. No ground check fuelpump relay. If both positive & ground fuelpump needs to be replaced.

The fuelpump is located inside the gas tank, you will need to drop the tank to replace the pump, heres a picture of the pump and in goes in through the top of the tank, the fuelpump is called a fuelpump module because it comes complete with holder sending unit and all other parts as you will see in the picture,hope this helps, good luck.

If you hear the fuelpump operate the first 1 or 2 seconds when the key is turned to RUN position, the fuelpump is working. If you do not hear the fuelpump run, check the Inertia switch which should be in the side panel of the rear cargo area. If you have an owners manual check for the Inertia switch location.

To reset the Inertia switch, hold the button on it for 2-3 seconds. You should now hear the pump run. You may also have a fuelpump relay under the hood in one of the Powerboxes. The Powerbox may have a fusible link from the Battery. When the fusible link is OK and the Pump Relay is OK, there is a fuse in the Fuse panel. Then finally the Ignition switch will trip the Pump relay. As power flows through the wire to the fuelpump the Inertia switch can break the power connection.

So you have 5 powerpoints before the fuelpump will work. Fusible link, Pump Relay, Fuse Panel, Ignition Switch,and Inertia switch. These must all work before the fuelpump can run.

Check the fuse block. Use a test light and don't rely on just looking at fuses. But if the main ignition control unit went bad, it will also cut the power to the fuel pump relay. Autozone will check the main control unit.

check all those item again, especially the crank sensor, check the fuel pump by adding 12v to it, make sure its good. tun on key, make sure your getting 12v from fuel pump wire