![]() Spray carb cleaner works perfectly on these parts. The fuel pump overheats trying to suck fuel past these blockages. The term vapor lock refers to when your fuel boils in your carburetor or fuel line and your fuel gets trapped inside. Excess gas bubbles accumulate as a result of the gas bubbles accumulating, preventing normal fuel delivery. Equations (1) and (2) give accurately the tempera- tures at which the vapor pressure of the gas. ![]() Sometimes pump "burns up" because the two plastic screens/filters (one in the fuel tank on the end of the fuel pick-up, and a cone shaped one between the tank and fuel pump - literally inside the hose that connects the tank to the pump) get blocked with crud. A vapor lock occurs when the fuel (usually gasoline) within the fuel delivery system overheats and vaporizes too rapidly. in terms of degrees fahrenheit per unit percentage evaporated. The fuel pump sits on top of the fuel tank there is an access plate in the trunk floor (driver side, under the hardboard floor) - undo that (1 screw and a lot of sealant goop) and you'll see the pump. As soon as the suck depression vaporizes the fuel there you are - some of the worst are English cars with SU pumps high on the firewall. they too work okay when cold and quit making enough fuel volume & pressure when they get warmed up. Vapor lock is almost always caused by relatively high pump sucking fuel upwards. 8 of the 10 wires on the wiring harness will have identical colors to the wires on the earlier model years - just splice those together leave the other 2 wires disconnected.Ģ: old/dying fuel pumps. They swap in easily if you get both the 88-later ignitor box AND a few inches of the wire harness leading to it. The 88-later metal box ignitors don't suffer t his bug - they tend to be much more reliable. If you assume that gasses don’t get into pipes or that they can’t constrict the flow, you might design a pipeline that. the joint pulls apart and the engine dies until the box is cool again. A demonstration and brief explanation of air lock in fluid pipelines. but when it gets physically hot and thermal expansion sets in. I did check the tank vent line when it was happening and there is raw gas dripping from the hose. I have taken it in and they couldnt final any issues. when physically cold the busted ends touch enough to make the ignitor operate normally. I shut it down, wait a minute and it will run fine for 5-10 minutes and then do it again. ![]() Anyway, the black plastic ignitors often develop a busted wire or bust solder joint. The 1987 ones are the most notorious - simply because there were more 87s sold. Vapor lock symptoms are typically "car stalls and/or won't start when hot" right? StarQuests "stall and/or won't start" when hot for different reasons:ġ: black plastic ignition module (aka "ignitor" or "knock box") bad. ![]()
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