2002 Durango SLT 4.7, 4x4. Just replaced all 8 plugs, ensured they were gapped to .040, runs and drives great, starts a little iffy, but other than that no problems. Right after I changed the plugs, I went around the block and my fuel gauge dropped of nothing (half a tank in it..) and code P 0463 came up, fuel pressure sending unit voltage hi. Shut off the truck, restarted it, fuel gauge came but but code was still there. Reset PCM and the code hasn't come back yet (will report back tonight if it returns..). Basically just wondering if anyone had any suggestions, or was it just cuz the old plugs were that bad and everything just needs time to re-adjust?

Side note: the old plugs were so old, they were no longer gapped correctly (too big of a gap..) and they were rusted (truck was bought from an insurance auction, where it likely sat for some time..)

 

i had the same code on my old d i replaced the relay in the PDC worked perfect after that

 

My truck was absolutely fine prior to the plug change, no codes (aside from the usual evap codes that I've been working on fixing..), then I changed the plugs, and all of a sudden, P 0463. Didn't touch anything other than the plugs. However I think resetting my PCM solved the issue cuz the code never came back after that. Trucks been running even better since as well. Thanks, but I guess my old plugs were just that bad...