![]() Realize the fuel is not completely boiling. When more power is needed, it revs and dies until the throttle is closed enough for the engine catch. The engine often can continue to run at low power because there is sufficient fuel in the bowl (and vapors going out the vent into the air cleaner). Chrysler dealt with this at several times including the use of fuel pumps that had a tiny return bleed built in. One more form of vapor problems was/is pushing liquid fuel in front of it into the carb bowls. (In fact you can measure the pressure in the feed line to determine where the problem lies.) Hot Fuel Lines This can happen on either suction or pressure side. Since its a flow situation, liquid fuel that contunes to be pumped into the local where vaporization occurs will continue to block the flow of liquid. Its vapor and the vapor pressure can exceed the pumping pressure. Some of it may get trapped in your horizontal filter and "appear" to be air.Ĭlick to expand.You are correct. The fuel will boil in the low pressure area,becoming a lighter than gasoline gas, and it will rise up to the float bowl. Now if the atmosphere cannot get into your tank, your pump is gonna stall. And atmospheric pressure, in the tank, forces the fuel to move towards that low pressure area in the very same way that you "suck" pop up a straw. It creates a low-pressure area in the system. ![]() ![]() Only the rear jumper is higher than the fuel level and does not leak fuel.Īnd remember the fuel pump does not suck. Unless new air is coming into the pump.Īnd the most likely places for that to happen is at the rear jumper, cuz if it was at the front you would see the evidence wherever the fuel is leaking. Eventually, the trapped air will be gone. No big deal if the bowl stays full.īut if the checkvalves are good, then the pressure will hold, and when fuel evaporates from the bowl, and the floatvalve opens, the trapped air will fly up the pipe into the bowl. Air in the filter doesn't matter much, unless a checkvalve in the pump is bad, then the compressed air in there will unload after shut-down and blow the fuel backwards. ![]()
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