That kills the accelerator pump totally, clears any flooding. To check for that, floor the gas pedal and hold it there, don't let up. Unless you are running high horsepower, like 400ish+, a QJ usually runs 4-6psi, so 7psi is maybe a bit much, and as said, you may not be vapor locking but flooding. With an electric pump in-line, really should have a pressure regulator with dial. Try turning on the ignition and wait 30 seconds or so, then 2x pumps on the gas pedal to 50%, the first sets choke, the second sprays gas via accelerator pump. Kinda like holding a finger over a McDonald's straw prevents the coke from dropping out the bottom.īecause you are missing that, most likely engine heat, exhaust heat, lack of decent thermal spacer gasket under the carb, something is cooking your fuel line and the gas inside. If you look at most qj filters, they'll have a check-ball inside that blocks up the fuel line when the pump isn't running. Given enough time, that line dries out, and you'll crank for a minute or 5 to fill the bowl up, or just sit with ignition on for a bit so the pump can fill the bowl. As the gas sits and heats up, it'll expand, pushing fuel into the carb bowl, which then evaporates, or pushing it out the leak, albeit slowly. Vapor lock is typically accompanied by performance problems such as misfires, poor acceleration, and reduced fuel efficiency. Vapor lock happens when fuel turns into gas after it heats up due to close exposure to the engine. Electric Fuel Pumps can also install near the tank. When a faulty fuel return line prevents fuel from returning to the fuel tank, then vapor lock can occur. Heat Shields can also be used in situations when they are appropriate. Routing gasoline lines away from exhaust parts, heater hoses, etc., is the first step in preventing vapor lock. The reason is that Gasoline vapor lock causes engines to stall, mostly when the car is in traffic and temperature is rising high. There are several symptoms that may point to vapor lock. However, if there's even a pinhole leak, that'll allow the gas between the pump and carb to dissipate, especially if the line is close to a heat source such as heads or exhaust. Vapor locks can avoid by using E85, Ethanol, and Methanol. What Is Vapor Lock Vapor lock occurs when fuel overheats and vaporizes in a fuel line, carburetor, or fuel injector, disrupting the correct air-fuel ratio. Once you turn off the ignition, the only part of the line that now has any pressure is the line behind the pump, being pushed there by the pressure in the tank. Check the plumbing and especially that oil type filter for any leak.
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