Just finished an 8 hour drive and I'm noticing my truck is lacking power at operating temperature, used to have no issues with taking off in 2nd when I had a FASS DDRP and stock injectors but now it struggles taking off in first while at operating temps.  *My fuel pressure at idle used to be around 9-10 at WOT it would drop to 0. This was when I first got the truck and knew nothing about it a few years ago now I have a FASS 150 with a sump and the gauge sits at 15psi and 14psi under WOT*. But I ran it like that for a couple of months just thinking above 0 was good enough. Fast forward to knowing what I know now, I'm pretty certain that I've damaged it and now I've got a weak VP44 but I don't have any codes or a CEL. All mods are in my signature, my iQuad shows my timing is moving properly as far as I know, it doesn't seem stuck or anything, no hard start issues. Thoughts? Replace it or just send it? 

On another note, the sluggish take offs could be map sensor related, but I see full sweep of 0 to 57 on the iquad while getting up to operating temps with plenty of power and my ISSPRO gauge can verify but when it's fully warmed up I get about 0 to 45 on the map sensor while the ISSPRO will still read 50+

Edited October 10, 20177 yr by Cronus577

Haha I know all too well of being wrong all the time. On the last 2 hours of the drive and she feels great. I'm at 16,210lbs gvw and these compounds keep me right at 900-1000f for my EGTs pulling a 6% grade for 6 miles. Extremely impressed with towing for 40 hours straight

9 hours ago, Cronus577 said:

Yes sir, well Puyallup, haven't been calculating MPG right now but not good having to fill up every 2 hours. Was going to add up all the receipts and calculate MPG that way using our route. But I actually feel a HUGE difference in not only power & torque, lower EGTs, quicker turbo spooling, and lower canbus fueling numbers after I unscrewed the fuel cap. I was using 5th until I hit California and they have a 55mph max towing speed, plus their highways are bumpy and destroyed. So I think the issue has been resolved. First idle torque taking off went from having to run 1500 rpm and slowly engage The clutch to being able to start to pull this trailer up a hill from a stop without touching the throttle, thanks a ton @Mopar1973Man@dripley and @JAG1 been dealing with this issue for around 2 years thinking it was the VP. Kind of mind boggling something like a tank vent come cause such significant issues to performance., 

 

Iwould have never thought about the tank vent ever causing this big an issue but thank you guys so much! Now I can teach my wife how to drive a manual and this dual disk clutch thanks y'all as well!

 

Cool, that's a nice area. I'm a bit north of you but nice to see more guys on here in the general area.

 

Also, glad you got your issue fixed! Sometimes it's the smallest things that are easiest to overlook.

9 hours ago, JAG1 said:

 

finding a cap that has it's own one way vent, you'll need to go to auto parts and keep trying till you find one that fits. I got lucky and found mine laying on the ground at a filling station, so I don't have a part number

Lol just found one randomly and thought "Send it!"? Haha. Will definitely try to find a vented cap soon, honestly would rather not try to deal with the vent itself. Will drill a hole in mine now just as a temp fix

Check out these vented locking/non-locking fuel caps.

https://www.oreillyauto.com/detail/stant-5674/fuel---emissions-16775/gas-cap-12847/diesel-lock-fuel-cap/10508d/5699303/2000/dodge/ram-2500?q=vented+fuel++cap

or this one

https://www.oreillyauto.com/detail/stant-5674/fuel---emissions-16775/gas-cap-12847/diesel-only-fuel-cap/10838d/5699408/2000/dodge/ram-2500?q=vented+fuel++cap

or this one

http://www.autozone.com/fuel-delivery/fuel-cap/duralast-fuel-cap/848454_0_3071

@IBMobile thanks bud, just ran to AutoZone and got one of the caps, $11 and some change your save my hands from cuts and some 4 letter words. Traveling from Washington to Texas tomorrow so let's see how that goes