This started a little while ago. The issue starts when I'm going down the hwy at about 65-70 and about 2000 rpm. When I punch it the truck starts to bog down, like it's not getting enough fuel. Eventually it gets worse to the point the truck dies. Sometimes the truck will start but when I press on the gas it bogs down again and I cant even get to 3000 rpm, then it dies again. After it dies I've always been able to get it started again after 10 min or so of trying. Then the truck runs fine for a while. Today it did it 4 times and I barely got home. Could this be the fuel pump failing?

I have a custom tune from Black Bear Perf. and after loading their tune the truck ran great. I sent them a data file after loading their tune and Justin told me the truck was running lean at high RMP, so on his suggestion I replaced the fuel filter. If that didn't fix the issue, he believes the fuel pump isn;t putting out enough pressure at the higher rmps and that it might need to be replaced. Based on that information, I'm thinking the fuel pump is crapping out on me. When BBP told me the truck was running lean at high rmp, I could not tell there was anything wrong with the truck, meaning it drove great. There were no symptoms whatsoever, at any speed.

Here's my other question to you guys. A couple of months back my AutoCal was popping O2 sensor errors, so I replaced all 4 of them. Shortly after doing that the AutoCal was giving me a Catalytic Converted code, which I just cleared. I came across a couple of posts stating that a Catalytic Converter can be clogged and cause these bog down issues, is that correct? Can a Cat. Converter do that??

Small update,
As I barely made it home today, the truck was dying in my driveway. It would barely rev up over 3500 to 4000 rpm. Two hours later the truck started up just fine with no issues at all. I even revved up the engine with no issues at all. COuld the issue be temperature related. Maybe this is the reason the truck starts up again after 10 minutes of trying to start the truck on the side of the road.


Thanks
R

 

Pump is going out, or something is impeding flow.
Before you put in a new pump, run a few bottles of good quality fuel injector cleaner through it.

 

Its very easy to diagnose a fuel pump. Go rent you a fuel pressure gauge and hook it up and drive around. Hooks into the schrader valve on the fuel rail. Test the pressure and go from there.

 

A catalytic converter can do that.

I actually just worked on a 6.0 that was having similar issues and eventually got to where it was missing BAD, it would start and run, idle was REALLY rough. His cat had actually come apart and was blocking the passanger side exhaust flow and the truck was building exhaust pressure bad enough back into the intake that it threw MAF and MAP sensor codes.

 

fuel filter, cat, plugs, fuel pump, etc. always start with cheapest to do in my opinion. if youre gonna try a good fuel injector cleaner, i highly recommend the chevron synthetic one.

a buddy of mine used to work at a dealership and said that is what they used to clean fuel injectors. customer came in, they take vehicle to the back, pour it in, drive for several blocks, return to dealership, park, wait for hour to charge hourly rate, call customer on intercom...lol. i had a bad running truck i was gonna trade in and didnt want to spend money on tune up. poured it in and ran great afterwards.

 

I'd start with a fuel filter personally, pump second and the cats last. Ive had several do this exact thing, sit a while (I guess all the trash falls of the filter element) and will start and run fine until its picked back up onto the filter. When you change the filter add a can of Seafoam to the fuel tank and run it. If it still acts up, you've eliminated a cheap part, have a fresh fuel filter and know its more than likely the pump.

While running shoot the cats with a temp gun and see what they're doing, if the inlet is MUCH hotter than the outlet side then you may have obstructed cats. I personally have only seen that a hand full of times on these trucks.

 

After they truck dying in my driveway last night and not moving it, I just got in it and it drove great. I punched from a dead stop and rpms went up to almost 5500 before changing to 2nd gear and then to almost 4500 before changing to 3rd gear. So whatever the issue i think temperature is involved.

Someone is telling me that its almost for sure the Fuel Pump. I'm taking it to the dealer tomorrow regardless.

R.