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If your fuel pump is working but not delivering fuel to the engine, it could be due to a few different reasons. Here are some possible causes and troubleshooting steps to take:
Clogged fuel filter: A clogged fuel filter can restrict the flow of fuel to the engine. Try replacing the fuel filter and see if that solves the problem.
Fuel pressure regulator malfunction: The fuel pressure regulator regulates the pressure of fuel delivered to the engine. If it's malfunctioning, it may not be delivering enough fuel to the engine. A mechanic can check the fuel pressure regulator and replace it if necessary.
Faulty fuel pump relay: The fuel pump relay is responsible for turning on the fuel pump when the engine starts. If the relay is faulty, it may not be sending power to the fuel pump, even though the pump is working. You can check the relay by swapping it with a known good relay of the same type.
Clogged fuel lines: Fuel lines can become clogged with dirt or debris, which can restrict the flow of fuel to the engine. A mechanic can inspect the fuel lines and clean or replace them if necessary.
Bad fuel pump: Even though the fuel pump is running, it may not be delivering enough fuel to the engine due to a malfunction. A mechanic can test the fuel pump to determine if it's functioning properly and replace it if necessary.
In any case, if you're having trouble getting fuel to the engine, it's best to have a qualified mechanic diagnose and fix the problem.
This is fuel pump diagram, comes from my database, not sure it is correct, but, It's all I have. The fuel pump relay has two sides, the load side and the control side. The control side is terminal A and terminal c. The control side needs voltage and ground, A is voltage, C is ground at the computer.
Engine cranking, you have spark at the plugs and fuel injector pulse? If you jump the relay, does the vehicle start and run? Any applicable trouble codes?
I would buy a fuel pump relay for that particular car. If that relay that you switched with the wiper relay isn't the same exact one then the fuel pump will not work properly. Make sure the right relay is in there. Could also be a clogged fuel filter.
I doubt it. If the map sensor were faulty, you should get a check engine light and a trouble code for the sensor stored in the computer. I would check the fuel pump relay and base fuel pressure. The pump may not be getting power from the relay but instead only from the oil pressure switch.
well you wont save money if you guess either but do this. Is it equipt with a tach meter (RPM range)? if it does we will use it to trouble shoot the car. Okay when you crank it do you see the needle moving just tiny tiny bit,if you then we know there is spark.how coil pulse are pick up by the tach. Okay now the fuel section have some one cycle the key but dont start. have the gas cap open, use you ear so you hear the pump,it will be hard to hear , can you hear it, now lets check the ignition switch why check Honda uses a ground signal to turn on the fuel pump when your ignition switch fails even though it cranks you wont get a fuel signal. and no pump the only way to know for certainty is a test light, there are relays that why you cycle the switch and there is a pump fuse and that in the engine comportament and it is marked as fuel pump fuse.
the crank sensor is most likely the problem. If the PCM does not sense the engine is cranking then the fuel pump will not turn on. Also just because a fuel pump will run does not mean it will pump fuel.. Jump it while its in the fuel tank to see if it will pump. But still when you turn the key on you only have power to the fuel pump for 3 seconds unless you continue to crank. . If you have a 3 second voltage pulse when you cycle the key on, then spray some quick start or brake cleaner. If it now starts and you know the fuel pump has power then the fuel pump needs replacement. If you don't have the 3 second pulse look at the crank sensor as being the problem,
if you have no fuel when the and it just wont start it may be the crank position sensor if it's the 4.0l engine the crankshaft position sensor is on the top of the transmission bell housing on the driver's side and can be accessed from underneath the vehicle and is plugged in at the back of the intake manifold
OK...Some cars use a "prime" relay and a "run" relay on the fuel pump. since manually priming it seems to work, I'd check and see if you have a similar system. If so, the prime relay may be bad.
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