Another very important test in diagnosing a fuel delivery system complaint, is checking the amperage draw of the fuel pump. In a good working order, the standard current draw of a fuel pump is between 3 to 10 amps (varies for each vehicle and because pumps slightly differ). You obviously need a multimeter (able to measure current) and some basic tools to go along.
Start by ensuring safety. Unplug the battery so you won't get electrocuted. This is can be critical because you are working with the fuel system and it can be very sensitive to electrical noise. You may be confusing that model with the regularly mounted, purchase box fuse found under the dashboard and in the engine compartment. Once found, pull out the fuse.
Next, get ready for your multimeter lead connection. Set your meter to amperage and ground one probe in the fuse socket. Clip the other lead to the fuse you removed. With this setup, the multimeter will be measuring how much current is going to fuel pump once the key is in the ON position.
Put the battery back in and set the ignition key to the “on” stage(Activity) but do not start the vehicle yet. That action will fire up the fuel pump and you can see what its amperage draw is. Check the reading of the multimeter. If the amperage falls between 3 to 10 amps, then chances are the fuel pump is working.
A measurement over 10 amps is too much, this would likely happen in an event of a problem such as fuel lines full block, or the pump itself. On the contrary, if there is a notable decrease in amperage than it should be, it could signify that the fuel pump is not turning on as per requirement (such as due to faulty relay, r wire harness issue or even due to bad fuel pump).
For example in a Chevrolet Silverado, while the fuel pump is running under normal circumstances, it usually draws around 6 to 8 amps. If the amperage is outside this range, it has become very necessary to do further research. A minimal check can avoid a big problem later on.
Mark W., a mechanic and automotive expert, adds, "Keeping an eye on the amperage draw of your fuel pump is crucial to keep your ride in peak performance which can save you thousands in costly repair work." This is an illustration of the relevance of regular maintenance.
And that is all for the fuel pump amperage: an easy check to provide peace of mind about how healthy your fuel system may or may not be. This will allow you to verify that the fuel pump is working properly with a multimeter and safety in mind. To learn more about how to take care of your fuel pump, click Fuel Pump.