6.0 Starting Problem
I've read through several threads and I believe I have an idea of my problem, but just to add some level of confidence to my thoughts I want to get a little more feedback.
First, thanks to everyone here for making this a very valuable site. I've read some great information here and learned a good bit in a short amount of time. Good work to everyone one that contributes.
The truck is a 2003 6.0 (I can't say if it's "early" or not yet. I'll check that when I get home).
I started the truck the other day to warm up before leaving. After it was running for roughly 5 minutes, it died. I started it back up and it ran for maybe 30 seconds. I started again, and it nearly didn't fire up. Once running this time, I throttled it up to 1.5k and it sounded good. I ran it up to 2k and still sounded good. Once I let off the throttle, the RPMs just kept reducing until it stopped running.
I've not dealt personally with diesel repairs, but have a good background in gas motors. My first thought was fuel delivery. That being said, I replaced the fuel filters.
The truck started up after the filter install and I thought the issue was resolved. The truck ran for nearly 10 minutes and repeated the same symptoms. This time I noticed a whining sound coming from the same area as the lower fuel filter when the key was turned on. The sound lasted about 30 seconds which to me would've been the fuel pump pressurizing. I turned the key on, then off 3 times, then started. The truck fired up, I accelerated up and held it at 1.5k. The engine sounded smooth and normal. I let off, the truck idled down nothing. I tried to immediately start up again with no success. I repeated turning the key on and off 3x and it started up.
My gut tells me it's something with a fuel pump, but reading through some threads here suggests it may be HPOP. Any ideas would be helpful.
Thanks for the info and making a great site.