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Fuel pump diagnosis

Replaced fuel pump, still won't start

Posted by Anonymous on

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 2185 Answers

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

J-Chris Ward
  • 731 Answers

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

  • 212 Answers

SOURCE: won't start - runs w gas added 2 the carb.

Check and make sure there is power going to fuel pump.Turn key on as you test wire (at pump)

Posted on Jun 13, 2011

  • 4803 Answers

SOURCE: 2001 chevy blazer won't start, no fuel,

Hi Ralph,
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.

Drive on!

Dave (dttech)

Posted on Oct 18, 2011

  • 2 Answers

SOURCE: engine cranks but won't start; how do I tell if fuel pump needs replacing?

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."

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2 Answers

2002 ford explorer sport will not crank

Check for fuel pressure. Commonly fuel pumps are changed when the inertial switch may have tripped. Google ford inertia switch. It is a resettable safety device for the fuel system.

Mar 05, 2017 | Ford Cars & Trucks

1 Answer

Hard starting

This problem can be hard to track down , it could be caused by several thing's ! A bad check valve in the fuel pump letting fuel drain back into the tank , not keeping fuel line pressure up , a crankshaft position sensor can also cause this as well as an ignition control module !
DEFINITION: Engine cranks OK, but does not start for a long time. Does eventually run, or may start but immediately dies.
Refer to Important Preliminary Checks Before Starting in Symptoms - Engine Controls .

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.

Fuel System
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 .

Ignition System
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

Wet plugs



Improper gap

Burned electrodes

Heavy deposits

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 .

Jul 14, 2015 | 2002 GMC Sierra 1500

1 Answer

1995 Lexus LS400. Car was left in garage for two weeks while we were on vacation. Upon return it won't start. Engine does turn over. Replaced fuel pump in attempt to troubleshoot. Mechanic ha

I assume the pump was replaced because it was getting power but no fuel pressure ?
Are you still not getting fuel pressure ?
Spark to the plugs ?
Normal compression when cranking the engine ?
Security light not staying on ?

Feb 09, 2013 | 1995 Lexus LS 400

2 Answers

Starts but won't stay running

Turn off all your accesories and turn the key forward, but dont start it. You should hear the pump kick on for 2-3 seconds. Prime the system a few times then start it. This will narrow your diagnosis

Dec 06, 2012 | 2002 Ford Escort

2 Answers

I have a 1992 lincoln town car an i wus woundering if any one- could tell me wat my problem might b i can start it and drive it for a day or less then my engine will stall an then it wont start for a day...

Sounds like something electrical, but you will have to narrow down the possibilities to proceed.
When it won't start, you need to find out if you are loosing spark to the plugs or fuel. Then go from there with your diagnosis.

Aug 28, 2012 | Cars & Trucks

1 Answer

Won't start after running out of gas

However, your problem is most likely in your fuel injection system. When you turn your ignition to 'ON' you should hear your fuel pump come on. If you do, you may only need to turn your ignition OFF/ON a few times for the fuel system to pump gas back to your engine. If you do not hear it come on, your fuel pump may need to be replaced. It'll need to be checked by someone with enough information to make an accurate diagnosis.

Aug 01, 2012 | 2001 Ford Taurus

1 Answer

Last week her trooper just died,wouldn't startt.We changed the fuel pump it ran for a week again it won't start.

Did you check the fuel pressure before all of this fuel pump replacement? If the fuel filter is old enough to be clogged up, it should have been changed long before replacing a fuel pump unit. Your fuel filter should be changed every 30,000 miles. However, it would have to be TOTALLY clogged up to keep the engine from starting. It would have been causing all kinds of drivability problems LONG before that could happen.

Then, has anybody bothered to check for spark when the engine will not start? Has anyone scanned the onboard computer? (which happens to be in full control of both the fuel system and the ignition system)

You just might be trying to repair the wrong system...

There is no way anyone online can accurately tell you why it will not run without checking the vehicle first....although many uneducated DIYers might GUESS for you...which seems to be just as good as you are already doing....


May 20, 2012 | Cars & Trucks

1 Answer

2002 chevy silverado won't start, replaced fuel pump, still won't start

Same problem here, found break in wiring harness at cross-member behind cab. did have bed removed for easy access. Ground wire guilty party.

Dec 18, 2011 | 2002 Chevrolet Silverado

1 Answer

My 95 jeep grand cherokee limited is shutting down while driving suddenly. It looks like it happends after more than 30 min driving or when it runs in the same speed for several min. Any one have any idea...

Symptoms may include no start, rough idle, long crank times, driveway die outs or erratic fuel pressure. A new fuel pump has been released which delivers improved performance. This pump should be used whenever fuel pump failures are encountered.
Basic fuel system diagnostics should be used as outlined in the appropriate service manual. A brief recap of the basic diagnostics follows:
Fuel pressure specification - 49 psi - plus or minus 5 psi.
High fuel pressure indicates problems with the fuel pressure regulator. Refer to the service manual for regulator diagnosis. Do not replace the fuel pump for high pressure.
Low fuel pressure - Low pressure could indicate a pump problem or it could indicate a plugged fuel filter or restricted fuel line or no fuel in the tank. Be sure to check these items before replacing the fuel pump.
Fuel System Leak down - When checking fuel pressure be sure to check the integrity of the system after shut down. With the fuel pressure gauge connected, shut the engine off and observe the pressure gauge. The system should maintain at least 24 psi for five minutes after shut down. If the pressure bleeds off quicker, it could indicate that an injector is leaking down or that the pressure regulator is leaking. This can lead to driveablity problems and require further diagnosis.
I would start here and look at your fuel system closely

Nov 12, 2010 | 1996 Jeep Grand Cherokee

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