No fuel coming out of the fuel line further confirms a bad fuel pump. 2. find the wire (circuit) that feeds power (12 volts) to the fuel pump and with a multimeter in volts dc mode, verify that 12 volts are reaching the fuel pump when you crank the engine. case 2: the engine did not start, not even momentarily. Test 1: checking for power (low current circuit). test 2: checking for power (high current circuit). test 3: jumpering the fuel pump circuit. test 4: checking that the computer is activating the fuel pump relay. test 5: testing the fuel pump voltage output at the relay. test 6: fuel pump stays on all of the time.
Test 2: checking for power (high current circuit) so far, you have checked and confirmed that the low current circuit of the fuel pump relay is getting power (test 1). the next step, in troubleshooting the fuel pump relay, is to make sure that it's getting battery power on wire labeled with the number 4. this wire is the one that supplies power. Here we show how we diagnosed 3 separate problems in the same power circuit on a 1996 ford f 150. I had the privilege of visiting airtex, and while i was there i spoke with shane neuman about diagnosing a faulty fuel pump. in this video we go over the ba. Case 2: the fuel pressure gauge registered the correct fuel pressure specification. this fuel pressure gauge result lets you know that the fuel pump is working and delivering enough fuel to the fuel injectors. your 4.0l ford ranger (mazda b4000) is not starting due to another reason. however, the fuel pump is ok.
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