I have spent the last couple weekends up in the mountains at around 9500-10000 feet. The truck will start up on the first crank of the motor even in freezing temps without plugging the truck in. When I am down at my house, roughly 5000 feet, the truck is hard to start. Once i do get the truck started it will start right up for the rest of the day unless it sits for 3 or 4 hours. Not sure really what is going on.
The truck is a 2002 2500 6speed manual with 176000 miles. The only thing that I have done to it recently was the lift pump died about a month ago and I replaced it with a Raptor FRRP other than that the truck is completely stock. The truck is not throwing any codes.
Ok, next step is to find out what that is. Autoparts store or dodge dealer should be able to test this for you. Very important to know fuel pressure at all times to save the vp injection pump. Those get spendy in a hurry from lack of fuel pressure. There's lots of threads here about low fuel pressure causing problems.
Don't bother with a Dodge dealer. Most will only check idle pressure and that's not good enough. You need to check fuel pressure at idle and also WOT at highway speed. Then both number must be above at least 10 PSI but 14-20 PSI is optimal. Anything below 10 PSI is a instant fail.
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