Died while running in driveway. Turn the key on can hear the relay, the fuel pump turns on a couple of seconds, will not fire. gave it a shot of either it fired. checked fuel presure , It was only 31 psi, blocked the return line, still only 31 psi. cked the lines and fuel filter their ok too.seems to be power to the injectors and the ohms across injectors is ok. fuses look good too. I'm thinking fuel pump?
my truck wont start neather but the only difference is I also dont hear the relay when I open up the key ingnision can it be the fuel pump? GM repaced it 8 years ago at about 40k-50k miles. Now it has 141K miles.
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If you can hear the fuel pump then most likely the ASD relay and fuel pump circuit is working properly. If all it does is back fire w starting fluid something else is going on. Get a inexpensive code reader. Or turn the key 3 times quickly from off to accessory finishing on accessory and look at the odometer it should give you a code. Sounds like a timing issue or CKP, CMP coalition issue.
Generally speaking, its supposed to do that. The fuel pump(s) is powered by a relay that turns on for 3 seconds when you turn the key on. If the engine does not start and produce oil pressure, thats all the power the pump gets. If you were in a wreck the pump would shut off when the engine dies even with the key on to prevent a fire. You would need to jumper the relay to make the pump run beyond the 3 second time.
When you state "carb" I assume you mean TB as it should be Throttle Body Injection, unless it was converted.
You should be able to hear the fuel pump in the tank prime for about 2 seconds when you first turn the key on. May have to get your helper to remove the gas cap and listen through the filler.
If you don't hear a buzzing sound then check the relays on the firewall. You can turn the key off, wait a couple seconds and then turn the key on and have your helper listen and feel for the relay that clicks.
Or look for the wires,
The relay will have a dark green/white from the ECM
Grey is power to the pump when the relay is enegized.
Orange is hot at all times. It comes from the ECM B fuse. Should check that as well if not done so.
Black/white is a ground.
Now most likely if your relay clicks when the key is turned on then its all fine and the fuel pump has gone out. The oil pressure switch also enegizes the pump when there is oil pressure.
You need a new fuel pump relay. The engine fires up and runs off the oil pressure switch untill the oil pressure PSI is reached at normal operating conditions. When the oil pressure reaches its operating PSI the PCM or engines computer will shut off that circuit and turns on the fuel pump relay to run the fuel pump untill you shut the engine off
When you turn the key to the on position can you hear the fuel pump turn on? If not, the fuel pump relay has gone bad. Make sure you have at least 5 gallons of fuel in the tank. Check and make sure you have fuel flow to the rail, try cracking the banjo bolt on the fuel rail.
Did it run out of gas? could be fuel filter.Otherwise turn the key to the run position and you should hear the fuel pump (zzzzzzzzzzzzz),you may only hear it for a couple of seconds, turn the key off and back to run to hear it again.If you don't hear it I would suspect fuel pump,
Well when you turn the keys on the pump will only run for a few seconds A test light works ok but i would use a volt meeter at th efuel pump power and groung wires and measure the voltage while cranking the car