![]() Test 3īecause your fuel pump is likely submerged inside the gas tank, access to the wiring is challenging. This often encourages the pump to fire and is a sign that all is well with the wiring, but your fuel pump is sadly failing. Test 2īang on the bottom of the gas tank hard with just the heel of your hand while a helper turns the key on. The pump lives in the gas tank, and a quick test is, can you hear it when you turn the ignition on, but remember you’ll only hear it for about two seconds. You can check out all the tools I use here on the Electrical repair tools page. Both will save you a ton of time and heartache. That said, we can’t know for sure until we test it.īefore embarking on a journey of discovery with your vehicle, I strongly advise the use of proper electrical repair tools and a wiring diagram. A faulty pump is very likely your problem. That means your pump is working really hard, and it’s no surprise they fail a lot. If your car engine is running, the pump should be too. The attraction causes the armature to close, which completes the load side circuit and powers the pump. The load side contains a small spring-loaded armature that’s attracted to the magnet. When the ECM powers the control side of the relay, it sends voltage through a small coil which causes a magnetic field. (Engine compartment fuse box usually)Ī relay contains two separate circuits, a control side which is controlled by the ECM, and a load side which powers the pump. If your fuel pump has an external relay, and most have, its location is generally detailed in the drive’s manual, just like the fuses. They are either external and fitted in the fuse box or ECM integrated. ![]() What Does A Relay Do?įuel pump circuits employ a relay to control a high amp circuit with a low amp circuit. Inertia switches do go bad and are another possible reason a fuel pump won’t run. It activates on impact and kills power to the pump. Your car may also have an inertia switch fitted. Most car engines will shut off after an accident, but the ignition may remain on. Wiring the pump not to the ignition but instead to the crankshaft so that it only runs when the engine is actually turning is a safety feature. This number represents the fuse location number you checked in the driver’s manual. Looking closely, you may find the fuse location number printed on the fuse box floor at the foot of each fuse. Removing the fuse box cover reveals the fuses, which, apart from color, all look identical. Either side of the trunk wall behind the carpet. ![]() Under kick panel, drivers and passenger front.In most cases, the fuse box under the hood will contain both the fuel pump fuse and relay. It will likely show all this information in an easy-to-follow diagram form. A good driver’s manual will show the location of the fuse box and the fuel pump fuse number, rating, and color. ![]() It’s better to do a little research in the driver’s manual before removing covers in search of possibly the wrong fuse box. Most are well hidden from view and may require access to panels like glove boxes, trunk carpeting, or kick panel removal. As a result, it’s not unusual for a car to have three, four, or more fuse boxes. Modern cars use a ton of electric and computer modules to manage the various systems. ![]()
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