A fuel pump is a frequently (but not always) essential component on a car or other internal combustion engined device. Many engines (older motorcycle engines in particular) do not require any fuel pump at all, requiring only gravity to feed fuel from the fuel tank through a line or hose to the engine. But in non-gravity feed designs, fuel has to be pumped from the fuel tank to the engine and delivered under low pressure to the carburetor or under high pressure to the fuel injection system. Often, carbureted engines use low pressure mechanical pumps that are mounted outside the fuel tank, whereas fuel injected engines often use electric fuel pumps that are mounted inside the fuel tank (and some fuel injected engines have two fuel pumps: one low pressure/high volume supply pump in the tank and one high pressure/low volume pump on or near the engine).[1] Fuel filter
Fuel filter
A device that removes impurities (dirt and water) from the fuel before it gets to the carburetor or injection system. Filters may be made of metal or plastic screen, paper, or gauze. They are usually found near the carburetor in the fuel line that comes from the fuel pump (in-line fuel filter), or inside the carburetor (integral fuel filter) or within the fuel pump or fuel tank. These units must be cleaned or replaced on a regular basis, usually once a year or they will become clogged and restrict fuel to the carburetor. Without a filter, the jets and orifices in the carburetor will become clogged.
ection
Fuel Injection System
(FI) A fuel system that uses no carburetorbut sprays fuel either directly vinto thecylinders or into the intake manifold just ahead of the cylinders. It uses an electronic sensing device to deliver the correct amount into the combustion chamber. Throttle-body injection locates the injector(s) centrally in the throttle-body housing, while Port injectionallocates at least one injector for each cylinder near its Intake port. See
Central Fuel Injection Digital Fuel Injection Electronic fuel injection L-Jetronic fuel injection system Multi-point Fuel Injection Multiport Fuel Injection Port Fuel Injection Programmed Fuel Injection Sequential Electronic Fuel Injection Sequential fuel injection Throttle Body Fuel Injection Fuel injection pump
1. A pump which receives fuel from the fuel tank (often through the fuel-feed pump in the case of diesel engines) and delivers it under pressure to the injectors 2. A pump on diesel engines that sends fuel to its mini-pumps, and from there to the fuel injector nozzles.
Fuel injector
Fuel injector
1. A special nozzle which sprays the proper amount of gasoline or diesel fuel into the inlet ports, either directly into the combustion chamber or into a pre-chamber in response to signals from an electronic sensing device. 2. In all fuel-injection system (except Bosch CIS, CIS/Lambda, and CIS-E systems), a spring loaded, Solenoid (electromagnetic) valve which delivers fuel into the intake manifold, in response to electrical signals from the control module in the CIS, etc. System, the injector is simply a spring-loaded, pressure sensitive valve which opens at a preset value 3. Fuel tank
4. 5. Fuel tank 6. The storage compartment, under the trunk in most cars, that holds the fuel for the vehicle. Also called the gas tank.
Fuel transfer pump A pump that transfers fuel from the tank to the engine.
http://www.motorera.com/dictionary/pr.htm http://www.brighthubengineering.com/marine-engines-machinery/41669-functions-of-the-governor/
Carburetor Rebuild
Carburetor and fuel problems can fall into several categories and it is important to determine what is happening before proceeding with a rebuild on the carburetor. If the carburetor is leaking fuel especially while setting or just not getting fuel, you may have a contaminated fuel problem. You should look first at the fuel in your tank for any signs of dirt, water, rust or varnish build up. Before you consider rebuilding or replacing the carburetor you must have good clean fuel flow to it. When possible install the proper fuel filter for your application. Non-fuel pump engines use a different filter then fuel pump engines in most cases. It does no good to clean a carburetor and put contaminated or old fuel back into it. In some cases a rusty or badly varnished fuel tank will need to be replaced. Read my article on Stale Gasoline Problems
If you followed my advice above, you now have fresh clean fuel available to the carburetor. Now you will need to determine whether to rebuild your existing carburetor or replace it. Many of the carburetors today can cost $100 or more and the rebuild kit price sounds attractive. One piece of advice here. A new carburetor will almost always be better then a rebuilt one! I have rebuilt carburetors that did not perform well after the rebuild, so a rebuild is not a 100% fix. It is a very economical fix in many cases when compared to a new carburetor and your free labor, plus it's kind of fun to do. Here's a list of things to think about when evaluating whether to rebuild your carburetor:
Does the engine run well under load, does it idle ok, does the governor hunt? Is the carburetor in usable condition, throttle shafts, linkages loose? After removing the bowl, do you have water corrosion, varnish or dirt? Is there any signs of warpage on the mounting surfaces? Is the float and bowl ok, are they pitted and possibly leaking? Is the carburetor leaking fuel while just setting, possibly into the crankcase?
After evaluating the questions above, you will be able to make a more informed decision on whether to rebuild or replace your carburetor. Clean up is important, especially if you have a varnish problem. If you have a water corrosion problem, which looks like a white powder rust, you may want to just replace the carburetor. Carburetor cleaner will not clean water corrosion. Carburetor cleaners comes in two types. The cold emersion cleaner (dip-tank) and carb/choke spray. The dip tank is best and you can buy a one gallon can for about $15 at auto supply places. This is caustic stuff and don't put any non-metal items in it. Carb/Choke spray like Gum-Out works fine and probably best for the average homeowner. It has the added advantage of having pressure to blast the little passages. A piece of soft shipping tag wire is your next best weapon to run through the little holes.
Now comes the actual rebuilding part. I would not recommend that you take the carburetor totally apart until you have the repair kit. You do need to determine if you need a new float, bowl or other parts not included in the repair kit. Most repair kits include a needle valve and all gaskets. I normally do not remove the throttle or choke shaft unless I am replacing them. If you do, be sure to lock tight or replace the screws. These can make a nice mark on your piston when they come out later. Clean all the passages good and run the tag wire through all the little holes. If in doubt on the float setting, just set it parallel with the base. Set the initial jet screws at 1-1/2 turns out and fine tune after you have it running. Many of the newer engines will not have adjustable jets or maybe only an idle jet adjustment. You are now ready to re-install everything, making sure your governor linkage works freely. Pull the
rope or turn the key and listen to it - Bruce Perrault
The job of a carburetor is to mix the correct proportion of gasoline and air for the engine by using the Bernoulli principle. Carburetor
Click image to supersize Carburetor
(Carb) Optionally spelled carburetter or carburettor. A device thatVaporizes fuel and mixes it with air in proper quantities and proportions to suit the varying needs of the engine. A Filterscreens the air which is drawn into the carburetor. Here thegasoline mixes with the air and this fuel vapor enters thecombustion chamber through the intake valve where it is compressed and burned.
Carburetor adapter An adapter that is used to fit or place one type of carburetor on an intake manifold that may not be originally designed for it. Also used to adapt four-barrel carburetors to two-barrel manifolds. Carburetor barrel The tube-like part of the vehicle through which air flows and is mixed with Vaporized fuel. The choke butterfly valve is located at the top of the carburetor barrel, and the Throttle valve is located at the bottom. Midway through, the barrel narrows, and this part is called the Venturi. Carburetors can have one, two, or four barrels.
Carburetor base The lower part of the carburetor in which the throttle plate is located Carburetor engine A combustion engine which uses a carburetor instead of fuel injection.
Carburetor fuel bowl A small fuel storage area in the carburetor, located at the carburetor fuel inlet. Also called the float bowl because it contains the carburetor float Carburetor fuel bowl vent A vent on the float bowl. It typically is connected to an Carbon canister, which absorbs vapors when the engine is off, and it also may be vented to the atmosphere when the engine is running. Carburetor fuel filter
Carburetor Fuel Filter
A filter made of pleated paper or sintered bronze that is mounted into the body of the carburetor at the float bowl fuel inlet. It is held in place by the fuel hose/pipe fittings. On some cars, a small in-line filter is screwed directly into the carburetor's fuel inlet. Also called an integral fuel filter. Carburetor fuel inlet A threaded fitting on the side of the carburetor to which tubing from the fuel pump is connected. Fuel enters the carburetor at this point. Carburetor icing The formation of ice on the Throttle plate or valve during certain atmospheric conditions. As the fuelNozzles feed fuel into the Air horn it turns to a vapor. This robs heat from the air and when weather conditions are just right (fairly cool and quite humid) ice may form.
Intake manifold Intake manifold
1. A sleeve or flange made of rubber or metal to attach to the intake port. 2. The connecting tubes between the base of the carburetor and the portopenings to the intake valve or intake ports. The air-fuel mixture travels from the throttle body into a chamber called the plenum which feeds individual tubes (called runners) which lead to the individual intake port. Its purpose is to transfer the air-fuel mixtureto each cylinder. It is usually an aluminum casting or a GRPmolding, with one intake opening and as many outlets as there are cylinders in the engine. Also called inlet pipe. 3. The British term is inlet manifold
See
Petron http://www.petron.com/web/site/lists/59
Gasoline
Different cars have different octane needs. But you can always expect to find the unsurpassed cleaning power of Techron in all
grades of Chevron gasoline. The benefits of Chevron with Techron are numerous.
Benefits of Chevron with Techron
Helps restore lost engine performance caused by deposits left by .lower quality gasolines
Helps keep emissions low
Unsurpassed ability to clean vital engine parts such as dirty fuel .injectors and intake valves
Depending on the specific requirements of your car's engine, Chevron offers three different grades of our quality gasoline – all
with the cleaning power of Techron. If you're unsure of .which grade your car requires, consult your owner's manual.
Chevron Regular
Recommended for most gasoline-powered passenger cars and trucks.
Chevron Plus
Recommended for higher-performance cars and engines prone to knocking on lower .octane levels.
Chevron Supreme
Recommended for cars where the manufacturer recommends use of premium grade gasoline.
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