QuestionCar wont stay stared Ran gas down low.I have to spray Choke clean in carbonrator start up then shut off.put dry gas still wont start.Some body saids theres a manual button that you can push.I can't fine need help
AnswerThere is NO manual button.
Fuel pump test:
1. Get yourself a helper.
2. remove the gas cap.
3. have one person listen in the gas tank at the gas cap opening.
4. have the other person turn the ignition switch to the ON position ONLY so as the dash lights come on. Do NOT attempt to start the engine.
5. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.
6. Does it ?.
7. If it does NOT run for the 2 seconds the fault is either the fuel pump or the fuel pump relay.
8. You need to put a fuel pump gage on the fuel line to be sure your getting sufficient pressure.
As soon as you turn ON the ignition switch to ON position, Just before you turn the key to the start position when the engine starts to crank over, A 2 second battery voltage signal is sent from the computer to the fuel pump relay and then from the relay back to the fuel pump in the fuel tank. This runs the fuel pump for ONLY 2 seconds of which pressurizes the fuel system in preparation to start the engine.
Once the engine starts, The computer BYPASSES the fuel pump relay and sends constant contionous battery voltage from the computer to the oil pressure switch of which is now CLOSED because the oil pressure is UP because the engine is running. Therefore the battery voltage flows from the computer, thru the oil pressure switch, back to the fuel pump to run the fuel pump constantly until you turn OFF the engine.
Therefore if your POSITIVE you are hearing that 2 second pump run just when you turn the ignition switch to the ON position ONLY, just before you turn the ignition key to the start position, I would have to say you have a weak fuel pump upon initial start up and to have the fuel pressure tested..
If you are NOT hearing that 2 second fuel pump run, Then I would say that the fuel pump relay is defective or faulty computer..
If you are hearing the 2 second pump run then the computer may not be sending a constant signal to the fuel pump either via a defective oil pressure switch or faulty ecm.
