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There are several warning signs that your fuel pump may go bad before it actually does.
When an engine is running poorly or not at all, there's a tendency to blame the gas. Either it's “bad gas” or a bad fuel pump.
As winter approaches, it’s good to note that one of the leading causes of fuel pump failure is running on a low fuel tank, especially in cold weather.
Misdiagnosis is the leading cause of fuel pump problems and returns.
Changing a fuel pump is a fairly simple task for most shade-tree mechanics. However, in addition to mechanical know-how, the job requires the willingness to get a little messy.
Most vehicles with fuel injection utilize an electric fuel pump located in the fuel tank to supply sufficient volume and pressure to the injectors. Fuel is under pressure as it enters the fuel injector.
One of the main causes for fuel pump failures is contaminated fuel. Visible and invisible contaminants can damage the new fuel pump.
When you remove an electric fuel pump from a gas tank you'll notice a filter or sock on one end. This is what's called the "strainer." It might look like an afterthought, but it's an essential part of the fuel delivery system.
It is important to check everything else before you do a costly and perhaps unnecessary fuel pump replacement. Look for electrical problems, bad wiring, a short, split hoses, a vacuum leak or a clogged fuel filter.
When you order a fuel pump for your vehicle, you may be surprised to see it in a huge box. That is because you must replace the entire fuel pump module or hanger instead of just the fuel pump. Some units are “open” so you can see the pump, sock, filter and wiring; and some of “closed” so you see a large plastic cylinder.
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