I bought a fuel pump, tested it with 12 volts and installed it. got no sound from pump, checked relays, fuses, battery power, plenty of gas (if it were on e, the tank wouldnt have weighed 80 pounds), the relay and fuse both have power, the pump works (jumped it with wire from the battery, creates pressure, car starts, no leaks!) followed the wires all the way from the pump to relay, mo bumps breaks or gouges. i have checked everything and more. I even checked the old pump and it actually works.
I guess on to my question, is there something in the car that will block the voltage from getting to the fuel pump? I have heard pcm and crankshaft sensor, If so would you be able to describe the procedure to narrow it down to one or the other or a possible solution to the issue. Thank you in advance for your time and help.
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Re: 2000 chevy cavalier wont turn over
Firstly check if you have a pressure sensor in the fuel manifold . If you have then it controls power to the ECM to the pump relay to the pump and switches the pump off when fuel pressure in the manifold is reached . Also check for a fuel emergency shut off switch that you may have to reset
Testimonial: "thank you for a quick response, there is no fuel pressure in the manifold, i disconnected the fuel line from the engine to make sure. not sure about the fuel emergency shut off switch. i would say the main problem is that there is no power going to the fuel pump other than the 5v constant. the wires that are supposed to carry the 12v are all new and free of defects. if i "jump carry" the 12v from the battery to the relay, i get power to the pump no problem."
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Fuel pump? If you don't hear it, you need to check if the pump has failed, or if there's a problem in the circuit to the pump. To check, pull off the fuel pump tank connector at the gas tank, and check for power on the fuel pump wire while a helper is cranking the engine over. If you have 12 volts there (can use a voltmeter or a test light), the pump has failed and need replacing. If no power when cranking engine, the fuel pump circuit will have to be diagnosed. You will need a wiring diagram of the pump circuit. It is a fused circuit, so first check the fuse. If fuse is good, find the fuel pump relay and hold a finger lightly on it while helper turns the key to on. The relay should click when key is turned to on. If it does, pull the relay out and check that the power feed for the pump is available on one terminal where the relay plugs in. Use the test light probe and check all terminals-one should be "hot at all times". If none have a signal (key is OFF), then power is lost between battery and that relay terminal. From here on, you will need a wiring diagram...Good luck.
The ASD relay supplies battery voltage (12+ volts) to the fuel injectors
and ignition coil(s). With certain emissions packages it also supplies
12-volts to the oxygen sensor heating elements. The Fuel Pump Relay is a
separate relay controlled by the ASD relay input to the PCM. Fuse #12
(10amp) provides 12 volts to the coil side of both the relays and the
ignition switch. Fuse #6 (30 amps) supplies 12 volts to the output side
of the relay. Fuse #16 (15 amp) from the relay output to the Oxygen
Sensors and Fuse #26 (15 amp) relay output to the PCM. Fuse #24 (20 amp)
is Fuel pump relay output to fuel pump. Fuse #19 (10 amp) supplies 12
volts direct to the PCM. look for burned or melted wires in the offending circuit. sounds like you wiggled a wire while installing new relay.
There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse. You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump. If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse. That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.
The fuel pump relay is powered by a fusible link connected to the starter solenoid on the positive battery terminal. That fusible link feeds the 10 amp fuse near the relay. You can test the fusible links with a 12 volt test lamp. If the fusible link test okay check for an open circuit in the wire between the link and the 10 amp fuse. Hope this gets you fixed.
Replace the oil pressure switch for the third wire on that sends 12 volts to the fuel pump upon turning the ignition key on to prime. Once oil pressure is achived the computer shuts that circuit off and turns on the fuel pump relay to power the pump till you shut off the engine
first turn the key on and listen for the fuel pump to come on for 15 sec.this is to prime the system before you crank the engine.no sound,with only a rubber mallet( no metal hammers )hit the bottom of the gas tank,no fuel pump operating go to the fuel pump relay and remove then test for (2) 12 volt power supplies with key on,if ok check ground at relay if okay remove gas from tank and drop gas tank to check for voltage at pump.replace pump if 12 volts is present.
GM relays don't reset. My guess would be the electric fuel is not operating, For openers , I would start with the FUSE for the fuel pump. In a fuse panel UNDER THE HOOD. Should be marked. Probably a 30-40A maxi fuse. CHECK WITH A 12 VOLT TEST LIGHT. If that area passes all the tests, I would check for power to the fuel pump ( with the ign key on. 12 volt test light will go ON then OFF ) Could be a faulty fuel pump, Hope this helps