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See thats the thing i checked for fuses and relays when i first found out that i wasnt getting any power but their is no fuse or relay for the fuel pump in the fuse box. From what i was told the ecm has a internal relay that is for the fuel pump
as I mentioned above, the dealer added intank pump, installs an extra wiring harness, relay is located on drv side near brakebooster, and from there the power for it is taken from the drv side battery, you should see a fuse holder hooked to the positive terminal
2003, QC/SB. Edge Juice,Hot, AirDog150 S&B CAI, BD Flex plate/tripple loc T/C. georend VB Trans rebuilt by Me. Bilstien5100. carli Air Bags. RETIRED Military Mechanic (20yrs)
If your year has it, check the 30 amp PCM relay in the fuse box in the engine bay. Should be swappable with your trailer relay. Atleast it is in my 06. This happened to me the other day on the way home. I swapped them out and I was good as gravy.
In behind the plastic wheel well liner on the drivers side front wheel, down low there are 2 wiring harness plugs. One of these sends power to the in tank fuel pump. Unplug the correct harness and check the pins for corrosion. The ground pin may be corroded and not making the connection. As a side note, the in tank pump will not start unless it sees a full 12 volts. That little bit of info could have saved me almost $2000 three years ago. The engineer that thought it was a good idea to put 2 wiring harness plugs behind the front wheel should be beaten with a steaming turd.
yes i do realize the bump the starter but i did not know were all the plugs were so thank you for that and i had the dealer run my vin number and he said when the truck was built that the pump was built into the tank not on the back of theh filter canister.
Truck is up and running. The fuel pump relay went bad. I guess when the dealer installed it they forgot were they were supposed to mount it at cause it wasnt mounted it was just hanging down by the frame.... Thanks guys
I'm having the exact same issue on my 04.5. driving down the hwy it just sputtered and died like running out of fuel. gauge reads just under 1/2 and theres fuel in the canister but no fuel pressure. I pinned the in tank pump harness with help to bump the starter and got no power, traced it to the wheel well and pinned there at a connector and still no power. pulled a generic code that stated low fuel pump voltage (no really).. checked fuses 1 by 1 and theyre all good, gonna check for that relay ppl are speaking of at the battery in a few. Does anyone have any other ideas or ways to check for issues?? Thanks
There is a fusible link in the red wire that comes off the relay that is zip tied to the fire wall behnd the battery on the drivers side, check that. i had the same problem and that link was green corroded and broken
Im not seeing this link, is it hidden within the wire loom? Ive looked hi and lo and not able to see it. The other day the truck did this and i happened on to a blown fuse called "trailer battery", i replaced it and the truck ran. I went home than back to a friends and it died again with exact symptoms. Checked all fuses and flip flopped some relays but no luck. Im sure im overlooking something but what?????
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