If it is, that explains why the fuel gauge reads “E.” Too Lean, Too RichĪs previously stated, a gasoline engine requires about a 12:1 air-fuel ratio. While the sending unit is removed, check and see if the float is fuel-logged. Over a period of years, this filter could become clogged or may be completely deteriorated. While concentrating with the fuel tank, often there is a mesh filter covering the tank pick-up, which on some vehicles is part of the fuel tank sending unit. Eventually you will have a “no start” situation. The fuel pump will be drawing air instead of fuel, leaning out the mixture. As it deteriorates and cracks, it will leak. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. If the tank is serviceable, most radiator shops can clean out a contaminated fuel tank.
If large amounts of rust comes out, consider removing the tank for cleaning or replacement. This will remove water, which settles at the bottom, along with dirt and sediment. Periodically drain a quart or so from the tank. Many older cars have a drain plug at the bottom of the fuel tank. Both the government and the insurance industry have extensively tested sugar contamination of fuel tanks and all it does is clog the fuel system. The body designs of some cars can collect large amounts of water if the vehicle has sat outside for long periods of time during the rainy season.While on the subject of fuel tank contaminates, the myth that sugar will ruin an engine by freezing it solid is just that - an old wives’ tale. Foreign objects from acts of vandalism, such as sugar, or pieces of Styrofoam, cork or wood can also cause their share of problems. Sitting for long periods can develop rust and/or varnish. When in doubt, replace the fuel line.The fuel tank itself can be a source of problems. Additionally, the steel fuel line may have developed rust and corrosion both internally or externally or may have chafed against a frame member. Often, over time, that 2-inch connector can be the culprit. A good place to start would be to check the neoprene hose connector between the tank outlet and the fuel line. Before looking at the fuel pump, make sure there is gasoline in the tank.Another reason for poor fuel delivery on older vehicles is a pinhole leak in the fuel line. If no fuel comes out, then possibly the fuel pump isn’t working or the fuel filters are clogged. If there is fuel in the float bowl, and assuming the accelerator pump is operating properly, there should be a spray of gasoline squirted into the venturi every time the throttle is opened.Working backwards, if there is no fuel in the float bowl and the vehicle has been sitting for a long period of time, the gasoline may have evaporated and left varnish, which has clogged the inlet needle valve. No Fuel at All While the engine is off, a quick check requires removing the air cleaner for a look down the primary barrel(s) and to operate the throttle. Often a faulty spark plug, wire, sticking ignition points or sticking, improperly-adjusted or leaking valves can mistakenly be diagnosed as carburetor trouble.Ĭarburetion problems can be boiled down to no fuel at all, not enough fuel (lean), too much fuel (rich) or fuel delivered to only half of the cylinders. Ensure that compression is up to par in all of the cylinders, the valves are adjusted to their set clearances and the ignition system is operating properly. If the engine is not running right, the carburetor is the last thing that should be checked before blindly tearing into it.
#Carburetor troubleshooting guide manual
If one is intending to work on a specific carburetor, referring to the overhaul sheet (which is included with a repair or overhaul kit) or reading a shop manual would be very helpful. A carburetor has several different circuits and, depending on the make and design of the carburetor, different methods may be utilized in accomplishing these needed tasks. If not, the vehicle may not run properly, or may not run at all. Older vehicles use carburetors, which also do a pretty fair job of providing a fuel and air mixture – when they work correctly.
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