No power to Fuel Pumps

[Augustinaris]

Hello, I've recently run into a little problem with my ranger. While trying to diagnose an unrelated problem, I think I messed something up. I think what caused the problem is when I was using my digital multimeter, I didn't realize it was connected to the DC10A, and connected it to the connectors on the MAP sensor. I heard what sounded to be a running fluid, but I'm not sure. Anyways, Now I have no power to the fuel pumps.

I checked all the fuses, and the EEC and Fuel Pump Relays, and everything checks out. I bypassed everything to give direct power to fuel pump, and confirmed that they work. I'm getting spark to the engine, just no fuel. It seems like all other electronics work(all lights, Heater fan, horn, and anything else I tried checking). I unplugged and replugged a lot of electrical connections that I thought could potentially be the problem, I even crawled under the truck and did the same to any electrical connection i could see, including fuel pump wires. I also tried resetting the Intertia Switch inside the cab, as well as bypassing it to no avail.

Whenever I turn the key to the on position, everything goes as normal, except I don't hear the fuel pump prime itself. The starter works, and turns the motor, just no fuel.

I'm Stumped....any help would be greatly appreciated

Thanks!

 

[jhammel85]

When you checked the fuel pump relay, did you find that it had the same voltage going in that it had going out? If not, check that. If you aren't getting the same voltage out, it's time for a new relay.

 

[Augustinaris]

When you checked the fuel pump relay, did you find that it had the same voltage going in that it had going out? If not, check that. If you aren't getting the same voltage out, it's time for a new relay.

I initially checked all relays by taking them off the vehicle, and I found they all work properly. When I checked them on the truck though, I found that the EEC relay worked fine, but when checking the Fuel pump relay, I noticed that All of the wires had positive 12V going through them, except the one which should be going to the Inertia Switch, and then the fuel pump, which has 0V going through it. I'm not sure if I'm right with that finding, but even to make sure the relay was good, I hooked up a brand new relay, only to find the same thing...