![]() If you’ve gotten a “tighten fuel cap” message recently, but the cap was already tight, that’s a strong indication that there could be something wrong with the fuel cap.įuel caps have a rubber seal around them where they make contact with the fuel receiver. Since a missing, bad, or under-tightened fuel cap can make your Grand Marquis throw this code it’s a great place to start. The easiest place to start diagnosing P0451 is to take a look at the fuel cap. Here are some of the most common causes of P0451 in general. If there are other EVAP related trouble codes, concentrate on them first and see if it helps remedy this one. You may also notice the slight smell of gas. ![]() Fuel mileage may suffer a bit, and certainly the service engine soon light will come one. Typically, P0451 will not affect the way that your Grand Marquis runs or drives. P0451 is usually caused by either a bad EVAP pressure sensor, a clogged fuel tank relief valve, EVAP lines, EVAP wiring, or a bad fuel cap…. P0451 is usually caused by either a bad EVAP pressure sensor, a clogged fuel tank relief valve, EVAP lines, EVAP wiring, or a bad fuel cap. It means that your Mercury Grand Marquis‘s EVAP system has a pressure sensor that is malfunctioning in some way. Like all OBD-II trouble codes, P0451 has the same meaning for all vehicles.
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