Question about Mitsubishi Lancer
Replaced fuel pump, still won't start
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: silverado 02 won't start.
Is there a light on the dash that says SECURITY? These anti theft systems have been known to disable fuel.
Posted on May 15, 2011
SOURCE: replaced fuel pump but it
hi :) Some times when you replace a fuel pump you have to turn the engine over till the air is pumped out of the fuel lines. I spray gas into the air intake with a spray bottle while someone else is turning the engine over to help me prime the fuel lines. if you don't get the engine to fire with the spray bottle there is no spark and you need to look else where for the problem.
Posted on May 24, 2011
First let me say that Jeremy W's answer is absolutely correct.
However, I would like to take a moment to applaud you for your question. Most people would not bother to ask what the correct fuel pressure should be. YES! it is absolutely possible that the fuel pump motor could be spinning and not pumping fuel. This is WHY the fuel pressure should be checked, because this is the only true test that will tell you if your fuel pump is working correctly.
Then I would also like to add that if you find that the fuel pressure is correct, then this only eliminates your FUEL DELIVERY system. It does NOT eliminate your FUEL INJECTION system. It sounds pretty obvious that if it runs when you add fuel to the intake that the problem is definitely fuel-related though.
So if you find the fuel pressure to be OK, let us know and we can help you diagnose the fuel injection system.
You are going about this the right way---isolate the SYSTEM at fault first. Only then can you run pinpoint tests to determine the actual cause of the problem.
Posted on Oct 18, 2011
take the gas cap off and have some one listen when the key is turned on and listen for a humming if it hums its working you might want to replace the crank sensor that's the most common reason for no start
Posted on Dec 20, 2011
Testimonial: "checked for the hum and nothing. Bought a new fuel pump, removed the old pump and installed new one along with a new strainer & fuel line filter. Works great now. Thanks! Btw...the pump is inside the fuel tank & you must remove the tank in order to remove the pump. This isn't too complicated but it takes some time, patience, & a little help."
Tips for a great answer:
Inspect the powertrain control module (PCM) grounds for being clean, tight, and in the proper locations. Refer to Engine Controls Schematics .
Search for bulletins.
Test the engine coolant temperature (ECT) sensor for being shifted in value. Connect a scan tool. Compare the engine coolant temperature against the intake air temperature (IAT) on a cold engine. The ECT and IAT sensor values should be within ?± 3?°C (5?°F) of each other. If the ECT sensor is out of range with the IAT sensor, check the resistance of the ECT sensor. Refer to Temperature Versus Resistance for resistance specifications. Replace the ECT sensor if the resistance is not within the specification. If the sensor is within the specification, repair the ECT signal circuit for high resistance.
Inspect the mass air flow (MAF) sensor installation. A MAF sensor that is incorrectly installed may cause a hard start. Important: The embossed arrows on the MAF sensor indicate the direction of the intake air flow. The arrows must point toward the engine. Install the MAF in the proper direction. Refer to Mass Airflow Sensor/Intake Air Temperature Sensor Replacement .
Inspect the camshaft position (CMP) sensor for proper mounting and/or a bad connection. A long crank time occurs if the PCM does not receive a CMP signal.
Inspect the fuel pump relay operation. The fuel pump should turn ON for 2 seconds when you turn ON the ignition. Refer to Fuel Pump Electrical Circuit Diagnosis .
A faulty in-tank fuel pump check valve allows the fuel in the lines to drain back to the tank after the engine stops. Refer to Fuel System Diagnosis .
Inspect both injector fuses for being open. An open injector fuse causes four injectors and four ignition coils not to operate. Replace the fuse. Inspect the injector circuits and the ignition coil circuits for an intermittent short to ground.
Inspect for incorrect fuel pressure. Refer to Fuel System Diagnosis .
Inspect for a restricted fuel filter. Refer to Fuel System Diagnosis .
Inspect for a contaminated fuel condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
Test both injector fuses for being open. An open injector fuse causes four ignition coils and four injectors not to operate. Replace the fuse. Inspect the ignition coil circuits and the injector circuits for an intermittent short to ground.
Inspect for proper ignition voltage output with J 26792 Spark Tester. Refer to Electronic Ignition (EI) System Diagnosis .
Remove the spark plugs and check for the following:
Correct heat range
Refer to Spark Plug Inspection in Engine Electrical.
Determine the cause of the fouling before replacing the spark plugs if the spark plugs are gas, coolant, or oil fouled. Refer to DTC P0172 or P0175 for diagnosis of the rich condition. Refer to Spark Plug Inspection in Engine Electrical for diagnosis of coolant or oil fouled spark plugs.
Inspect for bare or shorted ignition wires.
Inspect for loose ignition coil grounds. Refer to Electronic Ignition (EI) System Diagnosis .
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