Help Vapor lock
Rschirka
Jeeper
As previously mentioned, the vapor‑lock issues I ran into in Colorado with my AMC 304 V8 were caused by the fuel boiling right at the mechanical pump. There were plenty of contributing factors, and the problem only showed up on steep climbs in low 4WD. At the time I was running an undersized radiator, a flex fan (pulls less air at RPM than it does at idle by design) with no shroud, and I even had an exhaust leak under the hood, so the heat load was working against me from every angle.
Since then, I’ve made several upgrades. I switched to a Holley Sniper setup, rerouted the fuel line to the opposite frame rail away from the single exhaust, added an in‑tank electric fuel pump, and upgraded to an aluminum radiator with electric fans that I can override on if needed. I haven’t made it back to Colorado yet, but I’m definitely ready for the rematch !
Since then, I’ve made several upgrades. I switched to a Holley Sniper setup, rerouted the fuel line to the opposite frame rail away from the single exhaust, added an in‑tank electric fuel pump, and upgraded to an aluminum radiator with electric fans that I can override on if needed. I haven’t made it back to Colorado yet, but I’m definitely ready for the rematch !
