Bad Fuel Pump Relay Symptoms. When the fuel pump relay goes bad, the fuel pump won't work properly. As a result, you'll notice one or more of the following symptoms. Note: Because other problems can present the same symptoms as a bad fuel pump relay, you'll want to perform a thorough diagnosis of the vehicle before replacing any parts. 128. 47K views 2 years ago #TOYOTAAvanza. Berikut adalah letak relay pompa bensin avanza 2011, sebelum mendiagnosa pompa bensin cek dulu relay fp, jangan sampai sudah diganti pompa bensin tetapi B4krJV.