Fuel pump relay is not being pulled in. Verified: Fuel Pump relay, Auto Shut Off relay, horn relay, fuel pump, installed new computer module.
Verified correct operation of Auto shutoff circuit, (relay is being pulled in) so cam and crank sensors are ok.
Jumper the N.O. terminals for the Fuel Pump relay and the pump runs just fine and produces fuel pressure. 12V is not present to pull in the Fuel Pump Relay.
Personally I wouldnt bother tracing the wire as it is probably not worth your time, and just run a constant 12v from the battery to the relay on like 10ga wire. There is probably a short somewhere in the system which can be a real headache to find.
Also it may sound dumb, but check your fuses, and the fusible links under the hood. Chances are that they are all fine though, especially if you have dash lights.
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If you are talking about the fuel pump, you have only a few cheap fixes before blaming the expensive fuel pump. The fuel pump relay can overheat and kick out. A new relay could fix this. Autozone.com offers free fusebox layouts and wiring diagrams just for registering your truck with them for free.
Sometimes the horn relay will interchange with other relays. Look at the part numbers and use the horn to test the fuel pump relay. Or switch the 2 relays.
A fuel filter could be clogged and overloading the fuel pump. Put in a new filter.
After that, its a case of testing the fuelpump leads and see if the fuelpump is shut down.
the fuel pump relay performs a slightly different function than the horn relay. If there is a wiring circuit printed on the outside of the relay's you will be able to see the difference.
AS you have "jumped" the fuel pump relay and the vehicle started, then the relay is not providing sufficent consistent power to the fuel pump. It is possible to check the relay using a digital multimeter, that will indicate which side of the relay is failing.
The most expedient method to address the potential and factual problems which you state, is to hook up a hand held :reader" to the car and observe the information given. That will give you a factual baseline to start with.
Has the car been running one day and won't start the next and thats why you replaced those parts? This may be the distributor ignition modual later then when it is going out can act like its got demon in it. This modualator will shut power down to your fuel pump.
Now you can try something first though. Run a wire from a hot wire to the fuel pump and see if it will start and run while that wire is hooked up.
If it does then you can find a wire that only becomes hot when the key is turned on so the pump won't run all the time and only when the car is running. This is called gerry riggen in the service and not the proper way to do it. You may get an engine line on because of it too which will put the computer into trouble mode and cut your power down. But maybe not. Try it and see what takes place. If it still won't start then we need to look into testing the ignition modualator. Keep me informed and I will be glad to help you in the matter as well. Raz
The neon don't have one, check the fuse and relay's. The fuel pump is also controlled by the Auto Shut down relay (ASD). The power supplied to the fuel pump. Ignition coil, fuel injectors, and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD). The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module. This causes the engine to shut down. Good luck and hope this helps.
no it doesn't. the fuel pum has a relay that is located in the junction box under the hood if your vehicle is not starting because your not getting fuel check the relay. I use the a/c clutch relay to switch with the fuel pump relay if the vehicle starts just replace the relay if the vehicle doesn't start then you have a bad fuel pump...please rate
dave again i just posted you so it is definately fuel related listen to see if the fuel pump turns as described in my last post if it does not you can test the relay by replacing it with a known good relay like the horn if your horn works but your fuel pump does not turn swap em see if the horn works still and if the pump now works. If the pump works and the horn does not reinstal the horn relay in its original position and replace fuel pump relay. do the same with fuel pump fuse as sometimes the fuse looks okay but is not. If you have a test light hook it to ground and make sure both metal tabs on the fuse light the light when the pump is activaed.
It could be the fuel pump.The only way to know is to test it with a fuel pressure guage. You can buy them at most auto parts stores. What you are describing it fairly typical of a bad pump.(runs fine until you shut it of then won't start). The car can not be push started without the pump running. The pump is not really hard to change, but the fuel tank has to be dropped to do it. the pump is inside of the gas tank. Hope this helped.