donjetman
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Looks to be quite a few design differences between those two pumps. FWIW, the original pump on my '07 wasn't labeled Bosch and I replaced it with a GM Genuine pump a few years ago. It's been fine since but I wasn't having fuel level indication problems. I'm curious if you may have developed a bad wire in the fuel gauge circuit. Now that it's back together it would be near impossible to check the resistance without dropping the tank again, so I would probably be looking at cluster as a next step if only because it's easier than proper electrical troubleshooting would be at this point.Short story: Problem = fuel gauge is still wonky w/CEL P0463 persists after installing new Bosch # 67442 fuel pump assembly. Vehicle still runs great.
Long story: Once I dropped my tank and removed the pump, it looked obvious to me that the pump had been changed before I purchased the vehicle, (Oct of 2018 w/130k miles). Why obvious? because it had a Bosch brand fuel pump assembly, and 1 one the fuel line connections in the tank wasn't perfectly seated.
I blew out the lines and no carbon pellets anywhere. The inside of tank was clean.
I went on the Bosch website, typed in my V.I.N., and purchased the part# it said was for my 07 6.2L Denali, pt# 67442. When it arrived the sending unit fuel level arm/float was clocked differently than the one that came out (see pic). I installed it anyway. There isn't any interference. The Bosch unit I pulled out, pt# F00HK00149, had been working perfectly for the 5+ yrs and 65k miles until a couple of months ago when the fuel gauge started acting wonky.
I assume there is something wrong with the gauge itself. I know there are independent shops that fix and customized gauge clusters here in town and online. Unless someone has a better idea? that's the direction I'm heading in.
PS: dropping the tank and changing the pump is not hard if: the tank is near empty, there isn't any rust, and a lift is nice.
View attachment 429631
I'm keeping the ole Bosch pump I pulled out for a spare.I have a 09 Yukon 2500 and just changed out both my fuel pumps(Dual Tank) and they both were Bosch with 2009 date code. I was also having fuel gauge issues, and didn't realize my truck has an aux tank until I got to digging. I assume Bosch came in these trucks stock. I ordered 2 AC Delco pumps and they both were Bosch. All seems fine now with the gauge since the swap.