Ok, moving this over from a road trip review in the Lounge http://coloradok5.com/forums/showthread.php?t=181238) since I'd hate to endure the wrath of tech in there. Went on a road trip this week with the nearly finished rig. As soon as I started up the Sonora Pass, which is very steep, the rig started stuttering and stalling. I could feather the gas for a while but eventually it would die. Now, here is the background on the rig: Installed a 45 gallon aftermarket metal tank a while back (write up in the Tech Articles forum). All new parts in the tank including pickup, sender, etc. About a month or two ago I take the rig out on its maiden voyage (http://coloradok5.com/forums/showthread.php?t=178278) After that trip I found out that I had reversed the vapor canister vent line and the fuel return line. The result was that I sent a bunch of charcoal and filter materials into my tank. I drained it as much as I could (there is a drain plug in the tank) and then replaced all the hoses on the fuel line, fuel return line, and vapor line and cleaned the metal lines blowing them out with compressed air. I have three filters actually running, one on the frame rail where the PO had installed some kind of funky electric pump, one outside of the carb, and the internal Q-jet filter. I replaced all three. Now, another interesting thing is the PO had put fiberglass insulation all the way down the fuel line frame rail previously held in by some kind of asbestos cardboard looking pieces tied in with wire. Clearly he had vapor lock issues in the past. It seems that was also the impetus for putting in the electric fuel pump in conjunction with the manual pump. Recently I had removed the electric setup, the insulation, and installed a new AC Delco manual fuel pump. Fast forward to the trip. When I first crawled under the rig at the first stall, I noticed a lot of crap in the rear filter on the frame rail. I've been replacing this filter over and over and obviously I never got all the crap out of the tank. So, I swap in a new filter (I brought several with me) and let it cool off for a while. I fire it up and away we go. It goes fine for about 5 miles then starts stalling again. It is the worst on steep grades and doesn't do it much on the downhill. Twice more I have to pull over. The first time I check the filter and it doesn't look clogged. But, I see it has air bubbles swirling all around the rear frame rail filter. Now I'm thinking vapor lock. I had put some heat reflective wrap on the fuel lines farther up by the TC but nothing in the back as it seemed far enough from the exhaust that it wouldn't make that much of a difference. I get some cold water from the cooler and throw it on the gas lines and let it sit a while. Back on the road and we finally make it to the summit and down the other side. It runs fine on the downhill and straightaways unless I try and push the speeds up beyond 65 mph, then it starts stuttering again. I'm thinking fuel starvation from either plugged lines, or the gas boiling. To make a long story short, I swap filters about 4 more times on the trip, barely make it home, and was ****ting eggrolls the entire time. So, I plan on doing a couple of things. First, I am going to insulate the entire fuel line along the frame rail from the exhaust heat. Second, I will remove my tank, pull the fuel takeup setup and check it out, and then have the tank thoroughly cleaned. I'm wondering though if it is going to be one of these two things? What say you? Something else entirely? I'm thinking a combo of vapor lock and something plugging the tank intake? Something else?