(Fails to rev up.). Start and dies, stalling . Mechanical fuel injection - Bosch K-Jetronic, Bosch K Jetronic Fig. Mechanical Fuel Injection. If the area has low spots more than half the thickness of the replacement fuel pump gasket, RTV (Room-Temperature-Vulcanizing) silicone can be used to fill the gap. Most mechanical fuel pumps have a weep hole on the bottom of the unit. If the mechanical pump is working correctly, it will push four to six ounces of gas into the bottle. Nevertheless, nothing automotive lasts forever. If the engine turns over but doesn’t start running, the first question you need to answer is whether your fuel tank is empty. With sufficient current, and a clean fuel filter, the next step is to remove, and replace the fuel pump. Setups can range from simple single-nozzle systems costing a few hundred dollars through to systems costing tens of thousands of dollars. The Rover 14CUX fuel injection system is relatively "tall", so its mechanical components typically must be modified to get it under the bonnet of a sports car. PRODUCT NAME:Fuel Pump OEM NO. If the timing cover is made out of aluminum, for example, you should clean the sealing surface by hand without using abrasive materials. Pump repair and flow testing, EFI conversion. In all cases, the fuel is pressurized by a pump which in the case of gasoline systems, is usually located inside the fuel tank. Locate the fuel pressure regulator, and isolate it from the system by inserting a piece of impermeable, but fuel resistant material between it and its attachment point. In the example of a small block Chevy V-8, for every engine revolution, the fuel pump actuator is pushed and released one time. Our team can perform high-quality Stanadyne injection pump troubleshooting whenever you have encountered an issue with your system or have noted decreased performance. However, the pressure regulator is a critically important component since it regulates and maintains the system pressure during cycles of acceleration and deceleration when the demand for fuel decreases, but system pressure remains constant, since the pump delivers fuel at a constant rate and pressure.The above is the short, and vastly over-simplified version of how fuel injection systems work, and while troubleshooting a fuel injection system is relatively easy, fixing it is often another matter entirely, so in the next section, we will look at some typical fuel injection system problems, and how to tell them apart from problems that have similar symptoms. While it can happen, the failure of these solenoid valves are rare, and it is more likely that there is an interruption in its power supply which keeps it in the closed position, thus starving the engine of fuel.Consult the manual to locate the fuse that protects this circuit. Bosch L-jetronic Fuel Injection Troubleshooting, Maintenance & Repair. Set up Instructions for Blow Through Mechanical Systems. Try to avoid touching the gas with bare skin or breathing its vapors. To make sure the bolt stays in place, apply a small amount of thread-locking compound before reassembly. Learning how to diagnose these problems is essential for keeping your car in shape. To diagnose a fuel injector problem you need a keen sense of your vehicle, a little time and some basic fuel injector knowledge. Leaking injectors cause incomplete combustion because they enrich the air/fuel mixture to the point where it cannot combust fully.Any change in the way the engine idles when an injector is disconnected points either to that particular injection being defective, or perfectly normal, and it can be difficult to distinguish between which is which, even for professional mechanics if there is no fault data available. The second way to evaluate the pump is to perform a fuel volume test. So to either confirm or eliminate defective injectors as the cause, do the following: If the engine idles, no matter how roughly or erratically, disconnect the electrical connector on top of each injector in turn. Avoid smoking near the fuel and do not allow any sparks near the open fuel line or carburetor. The fuel pressure is OK- but it still does not start. Locate, and replace the fuse that protects the pump. Testing fuel pressure on a throttle body injection system is similar to testing fuel pressure on a EFI multiport system. 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. If a resistance builds up after a few operations of the pump but disappears again after a while, the pump is leaking air, and the only remedy is replacement of the complete filter assembly. Most mechanical fuel pumps have a weep hole on the bottom of the unit. Commonly called 'Continuous Injection System (CIS) in the USA. 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. However, if there is smoke visible from the tail pipe, and it disappears when an injector is disconnected, it is possible that the injector had been causing the problem.However, smoke that is the result of excessive internal mechanical wear can also disappear if an injector is disconnected, since there will be no combustion to ignite excess oil in the cylinder. 2. The HEUI uses engine lubrication oil that is pressurized from 6 MPa (870 psi) to 28 MPa (4050 psi) in order to pump fuel from the injector. Proper diagnosis of either of these items is best accomplished with suitable diagnostic computers. Title: VW L-Jetronic Fuel Injection Workshop Manual Author: Robert Bosch Keywords: VW L-Jetronic Fuel Injection Workshop Manual Created Date: 1/23/2006 12:00:00 AM On standard models, the fuel pressure regulator would be where the letter “E” now indicates a custom fuel pressure gauge. Locate, and replace the fuel pump relay. 11. Between the years 1973 and 1995, the highly reliable, mechanical multi-point injection system K-Jetronic was installed as Original Equipment in series-production vehicles. So let us begin troubleshooting a fuel injection system in a logical sequence of tests, each of which will include information on diesel systems as well. Contact Information. Many inexpensive old-school vacuum testers can read mechanical fuel pump pressure just as well as vacuum pressure. If your diesel engine refuses to start, or will not accelerate, consult the manual on the correct procedure to remove, clean, and re-install the strainer. Nine times out of ten, a simple fuse replacement will get the solenoid working again. On many automobiles, the fuel pump actuator arm passes through the timing case cover. So before you begin troubleshooting a fuel injection system, check the vacuum system for broken, perished, or damaged vacuum lines. An effective mechanic trick is to use an empty 12-ounce soda bottle to collect a fuel sample while a partner cranks the engine for 30 seconds. The easiest and most obvious way to reduce the system's height is by milling the bottom surface of the plenum base. The system functions in a similar manner to the electronic systems that followed it, yet all the controls were … For a time, mechanical fuel injection was considered the high-water mark of fuel control. If it were not, the pressure gauge might give a low reading or no reading at all. A To fuel injectors B To warm up regulator The Yanmar injector pump delivers precisely metered and timed bursts of fuel to the fuel injectors via the injector lines. : 15100-60A01 RALCE OF ORIGIN:China BRAND NAME:As per buyer's requirement We supply all kinds of Fuel Pump for ISUZU, BENZ, … Some of the symptoms mentioned above can be caused by defects in the emission control system, such as a clogged catalytic converter or a defective oxygen sensor; however, such failures are unlikely to be the problem in the absence of an illuminated warning light on the dashboard. However, if there is no pressure, do the following: If the pump still does not work after replacing the fuse and relay, do the following: However, some systems use in-tank filters that can become clogged, so if sufficient current reaches the pump, the problem could be due to the filter being clogged. When the mechanical fuel pump leaks oil from a silicone gasket, the cause can often be traced back to improperly tightened pump mounting bolts. NOTE: On some diesel engines, each injector is connected to its own dedicated pump incorporated into the main pump body via a long steel pipe, and in these cases, it is best to remove the entire injector from the engine in order to check its spray pattern, and the volume of fuel that each injector delivers against specified amounts and values that are available in a repair manual. 4036 W. 1st Ave Eugene, OR 97402 Hours: M-F 7:30am-5:00pm Follow us on Facebook =======================================================================, ====================================================================, How To Troubleshoot A Fuel Injection System, Changing a Fuel Filter on Injected Engines, Engine speed is slow to increase. On classic cars with mechanical style fuel pumps, however, the pressure is much lower—between four and six PSI. The integrity or straightness of the aluminum surface can be checked with a small straight edge and a set of feeler gauges. electronic fuel injection (EFI) systems were developed that relied on numerous … Increase in oil level due to unburnt fuel collecting in the oil pan. One or more injectors have failed simultaneously, although this is rare. Once you have eliminated, or at least reduced the chances of something else being the problem, you can focus your attention to troubleshooting the fuel injection system in a logical, and step-by-step manner, and the first thing to do is to purchase a good repair manual for your car, as well as a dedicated fuel pressure gauge and a digital multimeter with which to check the voltages and amperages passing through various parts of the system, and upon which the system depends to function correctly. A working pump will squirt fuel into the carburetor. Even if your fuel gauge says that you still have some fuel, the gauge may be on the blink. Black, blue, or white smoke issuing from the tail pipe. However, if no fuel appears, verify the tank has gas and check the fuel line and fuel filter for blockages. Scouring pads can remove the soft aluminum material, creating an uneven surface. If you suspect that your fuel pump is not producing enough pressure, there are two tests you can perform. However, it is almost impossible to clear blockages in the almost microscopically small injection orifices, which means that simply replacing injectors is always the better option, instead of wasting time and money on trying to clean them out. One more thing…You do not need luck to diagnose your own car problems, nor do you need to be a mechanical genius- all you need is a good repair manual, some mechanical skills, and a small collection of basic, but high quality tools. Where the fuel pump mounts to the timing case cover a gasket provides a tight seal. This is of course entirely possible, so to help you identify fuel injection system problems, and how to go about troubleshooting a fuel injection system, let us take a brief look at how the system works, and how to recognize the symptoms of a defective system. However, over time, the lift pump may develop vacuum leaks where its plunger passes through the filter housing, and if this happens, the pressure pump draws out all of the diesel in the filter, leaving it empty.Because of the vacuum leak, fuel is prevented from being drawn into the filter at the same rate the pump sucks it out, which means that the engine shuts off because it is starved of fuel. Doing this yourself can save you a bundle, but we strongly advise that you have this done professionally due to the complexity of the procedure.The repair shop will measure the fuel flow through the injector, as well as the way it sprays the fuel, which is critical for complete, or correct combustion to take place. Because the HEUI is much different, a technician must use different troubleshooting methods. Once you have a basic understanding of how something works, it becomes easier to devise a diagnostic strategy that is logical, to the point, but most importantly, effective.
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