Care of the Fuel System of Ford Antique Cars
The Fuel System consists of :—
The Gasoline Tank, Sediment Bulb and Connections.
The Carburetor and Connections.
The Intake Manifold.
The purpose of the fuel system is to supply a vapor of gasoline and air to the cylinders where it is exploded to generate power.
Fuel is carried in a one-piece tank located in the cowl and separated from the engine by the steel dash. Fuel flows by gravity down the short feed lines to the carburetor where it is mixed with air to form a vapor. On the intake stroke of the piston this vapor is drawn into the cylinder where it is compressed and then exploded by the spark at the spark plug points.
Care of the Fuel System
1. The fuel gauge on the instrument panel indicates the amount of fuel in the tank. This gauge, conveniently placed before the driver, should eliminate the inconvenience of running out of gasoline.
2. Occasionally the sediment bulb should be drained by loosening the thumb screw at the bottom and allowing any water or dirt to drain off.
3. All connections in the fuel system should be kept tight to prevent leakage and loss of fuel.
4. The carburetor –
occasional cleaning will ensure the best carburetor operation. Close the valve under the fuel tank to prevent loss of fuel. Loosen the small nut and remove the carburetor strainer. Clean this strainer and replace, being sure to turn the nut up tight. It is a good plan to occasionally remove the drain plug at the bottom of the carburetor and drain for a few seconds.
(b) Regulating Fuel Mixture
The fuel mixture is regulated by the carburetor adjusting rod, the upper end of which is conveniently located for the driver.
Turning the adjustment to the right or clockwise results in a leaner mixture and to the left, or anti-clockwise in a richer mixture. (A lean mixture means a high ratio of air to the amount of fuel. A rich mixture means a high ratio of fuel to the amount of air).
Too rich a mixture causes excessive carbon, and overheating and is a waste of fuel. The mixture should be kept as lean as possible without reducing the power of the engine. This is particularly so when driving long distance which permits a fair speed being maintained.
(c) Adjustment for Starting
For starting the engine when cold the adjustment should be one-half to a full turn open, (i.e. to left, or anti-clockwise). The carburetor adjusting rod is also the choke rod, and, when pulled up, cuts off the air intake on the carburetor.
When starting a cold engine the choke should be pulled out for a few seconds while the starter is engaged.
DO NOT HOLD THE CHOKE LONGER THAN NECESSARY.
When the engine has warmed up the mixture can be made more lean by turning the adjustment to the right. An engine which is well run in can be operated with the adjustment almost closed. This is the most economical adjustment. When high speed or extreme power is desired the adjustment should be opened about Vs to 1/4 turn more than for normal operation.
(d) To Set Idling Adjustment
Fully retard the spark lever. Set the carburetor throttle stop screw so
that the engine will run sufficiently fast to keep from stalling. Turn the idling adjusting screw in or out until the engine hits evenly without rolling or skipping.
The correct setting of the idling adjustment screw is approximately 2 to 2/12 turns from its seat.
Next turn off stop screw until the exact engine idling speed is obtained. This adjustment should be made with the engine warm.
The Idling Adjustment cannot be satisfactorily made until the engine has been well run in as it may not be possible to set the carburetor throttle stop screw far enough out.