I have an 89 Ford F-350 that stops feeding gas to the engine on hot days. The truck is a 5-speed manual, 7.5L V8 with about 150k on the engine. The first time it happened was a few months ago when we had unusually warm weather for the time (live in Yuma, so 100+ is normal). Driving down the highway the engine would tug back from time to time as if fuel wasn't being fed properly. If I had to stop, it would be difficult to get it going again, and sometimes would stall. Any thoughts?
Sounds like vapor lock. A trick for this is get a few WOOD clothes pins. Attach clothes pins to the metal lines under the truck in various locations. The wooden clothes pins are now acting as a heat sink. They help draw the heat away from the fuel system. Pick up another fuel cap, preferably a vented cap to help release the extra pressure caused by the heat.
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