There is a schrader valve on the fuel line on the engine for attaching a fuel gauge to monitor the fuel pump for testing purposes, and it should have a cap on the valve similar to a valve stem cap on a tire. (relieving the fuel pressure is similar to letting the air out of a tire and watch out for any fuel spray) or you can loosen up a line fitting at the fuel filter until the pressure bleeds off then replace the fuel filter, and you might want to have a pan to catch the fuel in, and be very certain that there is no ignition source anywhere near the vehicle.
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