![]() One gas does not fit all areas or climates. Today Reid Vapor Pressures vary from 9-13 psi depending on climate, elevation, geography and season. This means the gasoline did not start boiling at low temperatures, like in today’s gasolines. Gasoline Vapor Pressure: In the old days(1925) gasoline “Reid Vapor Pressures” were around 4-5 psi as measured using the SAE tests procedures. The “heavier ends” finish boiling at up to 400☏. ![]() Generally, gasoline “lighter end” hydrocarbons start to boil as low as 90° F. Standardized tests are conducted for octane, vapor pressure (a “biggie” in fuel foaming), and fuel additives to control fuel injection, carburetion and combustion chamber carbon buildup.ĭistillation:All gasolines have a “distillation” curve. All gasoline manufacturers follow these tests to measure and control the quality, performance and production of gasoline. Please Note: Any restrictions or sharp bends in the fuel supply system promote vapor lock (fuel foaming) formation.įuel Testing: Gasoline testing,technical research and development is well documented by the SAE (Society of Automotive Engineers). Vapor lock (fuel foaming) is caused by overheating engines, insufficient fuel supply, fuel pump failures, 90° bends in fittings, cracked fuel lines, collapsed fuel lines, excessive under hood temperatures, engine block overheating, old radiators, and rotted-out block distribution tubes. Then, add around 50 degrees to estimate the coolant temperature. Using an infrared temperature gun, measure the outer surface on coolant passages. The carburetor handles liquid gasoline until the air-fuel mixture enters the main jet discharge nozzle. The same process happens in the carburetor bowl bottom surface at fuel temperatures from 90° to 100° F. Take a look at a pan of water on the stove just before the water temperature reaches 212° F. Vapor lock: In this article vapor lock is “fuel foaming” in technical terms.įuel foaming occurs when “lighter end” gasoline hydrocarbons start “boiling” and forming vapor This article will show you some servicing techniques for identifying causes for vapor lock and controlling boil over on your collectible vehicle.īut first, just what is vapor lock and boilin’ over? Is The gasoline with 10% ethanol causing the vapor lock? Maybe! Or is your cooling system boilin’ over? elevation in the Sierras, or going over 50 mph? How about idling in a parade? IS VAPOR LOCK your big problem on warm days over 80° or 100°, at sea level or at a 10,000 ft. Here Are Some Ways to Diagnose and Fix the Situation. Febru| By Milt Webb These Problems Are Experienced by Many Older Cars & Trucks.
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