EFI fuse blows when I try to start my pickup.

I drove from Washington to Alaska and I made it all the way up without a problem and I go to start my pickup up and it won't fire. I checked all my fuses and my EFI fuse keeps blowing out. I googled my problem and I saw a bunch of stuff about O2 sensors causing the problem but I disconnected them all and it still won't start and blows fuses so I put a small piece of stainless wire in the fuse slot and it gets red hot when I turn the ignition. All the O2 sensors seemed to be ok and nothing was melted like I kept reading about so now I'm out of ideas and wondering if anything else can cause that problem. I have a 2006 V6.

 

Time to replace the fuel pump.

 

Checked for chewed up wires under the Hood maybe.

 

Never bypass a fuse unless you want to burn you truck up or spend major money replacing burned up wires and electrical parts. You will cause way more damage then there was to begin with.

 

If you leave that stainless steel wire in there you are going to have a lot of melting going on. Pull it out and locate the short circuit.

 

Not so hasty! Sure, try unplugging the connector, or pulling the relay, but throwing parts at it without proper testing is a sure way to empty some pockets.

 

I am pretty confident this is the issue as I have seen it numerous times. Yes, I wouldn't recommend "throwing parts" at a problem and that is not what I am saying as none of us are there to physically examine the problem. My recommendation is take it to a mechanic and get it fixed but be prepared that it is most likely the fuel pump.

 

I checked all my fuel lines and I'm still getting fuel to the engine so I traced the problem all the way to the injectors I think. I just can't figure why that fuse is blowing and all my O2 sensors still have the heat shrink tubing on them with no marks.

 

Are you running a trd s/c by chance? If so then it's due to the power for the coolant pump, if not I'm not too sure

 

i cant see how this would happen without crossed wires or a bad voltage regulator, which i guess to be incorporated into the alternator. whats up with all the electrical issues lately, im scared



wheres Bama Toy? seriously i think he could help

 

Some wiring info, if it helps.

I doubt it's the fuel pump, that should be switched through a relay and fused separately. Double check me, but I'm almost 100 percent on that.

Does the efi fuse blow when the key is turned to the "on" position? Or only after you crank it over? That might help narrow it down. If it's an injector, that may not be energized before cranking it over.

Also, I notice there is an efi fuse and an "efi 2" fuse.....which one is it?

 

It blows when I turn the key to the on position and it's the EFI fuse not the EFI 2. That's a good point about the injectors not getting energized when the key is just in the on position I didn't think about that.

 

Okay, I will correct myself here. The efi fuse does feed the fuel pump. Looking at the schematic, if you pull the fuel pump relay out and try again, that will eliminate the fuel pump as the cause of the blown fuse.

 

EFI fuse kept blowing (175,000 miles). Disconnected all systems as recommended. No change. Checked wire harness, especially in areas where touching metal. Wasn't obvious but found that the harness had worn through underneath middle of truck on driver's side. Harness rubbing against side of frame rail. Resistor wire corroded and broken; white/black wire casing worn off. Spliced in new wire and EFI problem corrected.

P.S. In checking electrical system, found the underside of the starter cable covering had worn through from rubbing against frame (not obvious and starter was still working...for the moment).