A few years ago my youngest son and I took a trip to Southern Utah, flat towing my '76 FJ40 behind my '09 Silverado 2500HD. We found a nice campsite near the upper end of Red Canyon, which empties into Lake Powell (or what's left of it) not far downriver from Hite Marina.
The next morning we drove quite a ways down Red Canyon, then turned north on a very ancient two-track up and over the south slopes of Chocolate Drop into Blue Canyon (BTW, the next canyon to the north is White Canyon).
After checking out an interesting rock formation called "The Cobra", we started back up and over Chocolate Drop, but only got about a half a mile, a hundred yards at a time.
The FJ40 would fire up and drive for a bit, then stall out. Since it was past noon, we decided to temporarily abandon it there and hike back to camp, which was 16 miles away. The next morning we drove down Red Canyon in the truck to the Chocolate Drop "turnoff".
No way the Silverado was getting up that road, I just barely made it in the FJ40. We carried a fresh battery in our hands as we walked side-by-side up and over to the FJ40. I figured we could winch our way back up to the top of the slope below Chocolate Drop, then carefully coast down to the floor of Red Canyon and the truck. The main problem was that there are absolutely no trees of any kind in the entire area. We did manage to find a stout cedar post laying in the road, so I figured we could drop it part way into the numerous sinkholes in the bentonite clay along the road and use it as a winch anchor. Luckily I had a shovel in the FJ40 in case we needed to dig new holes. BTW, I still have that cedar post in the backyard.
We got back to the FJ40 and decided to try and start it up. This time I was able to barely keep it running with the choke cable pulled almost all the way out, so we started back over Chocolate Drop. When we got back to the truck, with the 2F still running, my son quickly moved over into the drivers seat and started back up Red Canyon to the highway. I followed in the truck. He was able to get all the way back to pavement, where we were able to hitch it up to the truck.
A few weeks later my wife and I drove the FJ40 to explore the area north of town, and the FJ40 started to have the same issue a few miles from home. We made it home OK, but well after dark. The next day I decided to check it out, it turns out the fuel pump was on its way out.