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The standard mechanical fuel pump found in classic cars is very reliable. Nevertheless, nothing automotive lasts forever.
If your car has an external fuel pump, you'll probably run into situations that will require you to test and possibly replace this component. Learning how to diagnose these problems is essential for keeping your car in shape.
On classic cars with mechanical style fuel pumps, however, the pressure is much lower—between four and six PSI. If you suspect that your fuel pump is not producing enough pressure, there are two tests you can perform.
The first is a simple pressure output test. Many inexpensive old-school vacuum testers can read mechanical fuel pump pressure just as well as vacuum pressure. To perform this test, you should connect the test gauge to the metal output line using a spare piece of rubber fuel hose and a clamp.
Once the connection is sealed, crank the engine over for 20 seconds. This will provide a full pressure reading, letting you know whether or not the pump is still in working order.
The second way to evaluate the pump is to perform a fuel volume test. This should be done even if you've already done the first pressure test, as pumps can sometimes produce pressure without producing it at the right volume.
An effective mechanic trick is to use an empty ounce soda bottle to collect a fuel sample while a partner cranks the engine for 30 seconds. If the mechanical pump is working correctly, it will push four to six ounces of gas into the bottle. Most mechanical fuel pumps have a weep hole on the bottom of the unit. When the internal diaphragm leaks, fuel escapes through the weep hole to notify the vehicle owner of a malfunction.
This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old. Another common place for a fuel leak to develop is in the rubber hose and metal tube that leads from the tank to the fuel pump. Since the metal tube is exposed to the elements, it's not uncommon for it to become rusted through to the point that the fuel is leaking out. Likewise, the rubber hose can also become worn out over time, leading to fuel leaks. If you notice that this component is damaged, replace it with a reinforced rubber fuel hose.
On many automobiles, the fuel pump actuator arm passes through the timing case cover. This arrangement allows the constant rotating motion of the camshaft or crankshaft to drive the arm.
Each pump is burnished for a highly polished finish, accented with black oxide TORX self-tapping screws. Available on both gasoline and alcohol models. As an industry leader, Carter is committed to supporting the customer before, during and after the sale with information that will help get the job done more efficiently.
If your fuel pump is not pumping enough fuel to keep up with the engine, it may need to be replaced. This can be completed in 12 seamless steps. Carter is committed to providing the highest quality parts in the industry. If a pump fails within the warranty period, we will gladly issue a credit or replace the failed product. Search by year, make and model - or look up the VIN - to find the most compatible part for the vehicle.
SinceCarter Fuel Systems has been a leading manufacturer of complete fuel system solutions for the professional installer. Mechanical Fuel Pumps Carter Fuel Systems offers a full offering of first generation mechanical fuel pumps. How to Replace a Fuel Pump. Read More. Proactively prevent issues by understanding these three main signs of fuel pump failures.
Pertinent information on universal pump guidelines including standard pump location. Our Warranty Carter is committed to providing the highest quality parts in the industry. Parts Finder Search by year, make and model - or look up the VIN - to find the most compatible part for the vehicle.
Equipment Type Small Engine. Free Shipping This item qualifies for free shipping to the lower 48 U. Connect With Us:. Fuel Pump. Kohler : S S S S Fuel Pump Kit.
Kohler : Kohler : S. Kohler : S S Fuel Valve Cover Kit. Fuel Pump Hose Kit. Assembly Diaphragm.Mechanical fuel pumps siphon fuel from the gas tank. It then pushes it to the carburetor when the engine is cranking or running. All mechanical fuel pumps used on inline six cylinder and V8 engines are diaphragm type. No adjustments or repairs are possible. The pump is operated by an eccentric lobe on the camshaft or the camshaft gear. On six cylinder engines, the eccentric rides directly on the fuel pump arm.
On V8 engines, a push rod between the camshaft eccentric and the fuel pump operates the fuel pump arm. So, There are two holes in the passenger side front of the engine. These holes were for engines that used front engine mounts. This will allow the OEM bolt to be re-inserted without the washers to secure the rod in place. Once the 2 fuel pump mounting bolts are tightened, the bolt securing the push rod can be removed.
They can be re-inserted with the washers under the head thereby preventing contact with the rod but sealing the hole. The longer bolt is to gently hold the fuel pump push rod in the retracted position. The camshaft has a lobe on it that causes the fuel pump push rod to move in and out. This is what makes the fuel pump actually pump fuel. Total travel of the pump rod is about 0. This lobe needs to be positioned in such a way that the rod is furthest back, away from the pump.
So, with the longer bolt in the upper hole, carefully tighten the bolt until it holds the push rod. Remove the fuel lines, plug them to prevent dirt from entering.
Mechanical Fuel Pumps
Remove the fuel pump mounting bolts, then the pump.Menu Menu. Search Everywhere Threads This forum This thread. Search titles only. Search Advanced search…. Everywhere Threads This forum This thread.
Apr 9, 16 3 3. Mechanical fuel pumps are attached directly to the engine and a lever on the pump is operated by an eccentric on the camshaft, which pulls down the flexible diaphragm to draw fuel into the pump by creating a vacuum. The pump chamber volume is decreased or increased by flexing the diaphragm.
Diaphragm spring pulls the diaphragm up, the force enables fuel to be expelled from the pump. The parts of mechanical fuel pumps are : 1. Upper body 2. Lower body 3. Valve plate 4. Diaphragm 5. Return spring 6.If a car stops and has not run out of petrol, check whether there is petrol in the carburettor.
If there is not, there is a fault in the fuel system. Disconnect the fuel line to the carburettorslipping a plastic bag over the end of the line as you do so to catch any fuel inside.How AC mechanical fuel pump works. ✔
Secure the bag with a rubber bandthen turn the engine over with the starter. If fuel spurts out, there is a carburettor fault See Checking and cleaning an SU carburettor.
If no fuel, or only a dribble, emerges, either there is a blockage or leak somewhere in the fuel line See Checking fuel pipes or the fuel pump is not working.
Some pumps are sealed and cannot be repaired; check to see if there are screws for dismantling.
Checking a mechanical fuel pump
A mechanical-pump drive hardly ever fails — though signs of wear may appear on the cam and operating leverlinkages and pins.
Diaphragms can leak. A small leak may affect the engine noticeably only at high speeds, but may also let petrol drip through into the camshaft area and from there to the sump. If this occurs, there is a risk of an explosion. Valves have a disc and a seating held together by a small cage. Pres- sure in one direction pushes the valve on to its seating, closing it; pressure the other way lifts the disc and opens the valve.
Valves last many years, but dirt can get in and stop them seating properly.
Mechanical Fuel Pumps – Basic Information And Troubleshooting
For cleaning, see Overhauling a mechanical fuel pump. Gaskets and loose fuel pipes may leak, and so may the seal between the diaphragm and the two halves of the pump body. Another occasional fault is loose mountings.
The pump is often out of sight, and bolts may work loose unnoticed. This will cause a severe oil leak See Checking for oil leaks. Have a couple of tapered plugs or old pencils handy to block the fuel lines in case they gush petrol when you disconnect them. Sometimes the lines are held on with wire clips which have to be cut off with side cutters. Replace them with new screw clips. Twisted wire can be used as a temporary measure. When refitting the pump, make sure the lever is above the camshaft.A diaphragm pump also known as a Membrane pump is a positive displacement pump that uses a combination of the reciprocating action of a rubberthermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm check valvebutterfly valves, flap valves, or any other form of shut-off valves to pump a fluid.
When the volume of a chamber of either type of pump is increased the diaphragm moving upthe pressure decreases, and fluid is drawn into the chamber . When the chamber pressure later increases from decreased volume the diaphragm moving downthe fluid previously drawn in is forced out. This action is similar to that of the cylinder in an internal combustion engine. Diaphragm Pumps deliver a hermetic seal between the drive mechanism and the compression chamber, allowing the pump to transfer, compress, and evacuate the medium without a lubricant.
An elastomeric diaphragm can be used as a versatile dynamic seal that removes many of the limitations found with other sealing methods. They do not leak, offer little friction, and can be constructed for low pressure sensitivity. With the right material consideration, diaphragms can seal over a wide range of pressures and temperatures without needing lubrication or maintenance.
Small mechanically activated diaphragm pumps are also used as air compressors and as a source of low-grade vacuum. Compared to other compressors, these pumps are quiet, cheap and, most importantly, have no moving parts in the airstream. This allows them to be used without added lubrication in contact with the air, so the compressed air produced can be guaranteed clean. Types of diaphragm pumps.
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