Question about 2001 Chevrolet Silverado 2500HD

10 Answers

Duramax diesel engine

The engine wont start unless we pump the primer pump,and after that it wont start again.some help plase.

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  • 11 more comments 
  • memosauto Sep 04, 2008

    it is a diesel engine the problem acording to somebody is the pump, which pump

  • memosauto Sep 04, 2008

    when the engine starts by pumping the primer pump it stays running if the pump was bad it wouldnt run

  • memosauto Sep 04, 2008

    i dont need help from electronics experts

  • memosauto Sep 04, 2008

    there is no in line fuel pump

  • memosauto Sep 04, 2008

    need help from expert.

  • memosauto Sep 04, 2008

    its got a fuel filter end heater element bracket and thats it

  • memosauto Sep 04, 2008

    the engine does not stall and it isnt a 6.5 its a6.6 duramax

  • memosauto Sep 04, 2008

    6.6 diesel engine

  • memosauto Sep 04, 2008

    yes it stay running

  • memosauto Sep 04, 2008

    yes it stay running

  • memosauto Sep 04, 2008

    no thanks

  • memosauto Sep 04, 2008

    ok

  • Anonymous Mar 22, 2014

    changes motor and cam sensor. Won't start and has cod p3041

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10 Answers

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Just a thought, the pump has a check vale in it that keeps the fuel from draining back when the engine is off. If the check valve is bad, then the fuel drains back and creates an air pocket that doesn't allow it to pump the fuel, basically it create a vacuum lock in the pump so no fuel can get through it. So, you can't rule out the pump completely just because it stays running. Now I know that I'm just a computer tech here and the 6 years of shop foreman as a auto and diesel mechanic don't count, but it's a thought.

Posted on Sep 04, 2008

  • kuben naidoo
    kuben naidoo Nov 28, 2013

    ok thats a great idea but do you think i should change anytthing

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  • Chevrolet Master
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Even if the pump works after is started, you cannot be sure the pump is not faulty.
The pump is energised by a solenoid, test the solenoid, if it is faulty replace it.
If solenoid is working and pump is being energised properly (you can test this) then, even if pump works it can jam up each time you stop it, in this case replace the pump.

Posted on Sep 04, 2008

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Sounds like you have a leak in the fuel system.This will cause the pump not to be able to get suction.
there is a big fitting on the right side of engine up front this is the fuel fitting need to check fo vacuum. have you replaced filter??need to be replaced every 15k miles if you have then might have a cut oring

Posted on Sep 04, 2008

  • TripleTauto
    TripleTauto Sep 04, 2008

    The only pump you have is the injection pump.Dang some of these so called experts!!!!

  • TripleTauto
    TripleTauto Sep 04, 2008

    The fuel system on this truck has to be 100% airtight your problem is a leak somewhere from the injection pump to the tank

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You need to get the air bubble released from the pump so all you need to do is manually open the pump screw and the pump out some diesel which will take care of the starting and jerking problem.

Posted on Sep 04, 2008

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  • Master
  • 421 Answers

You may also check your inline fuel pump under the truck should also be a water seperator inline with it, should have12volt key on cranking

Posted on Sep 04, 2008

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  • jeff r
    jeff r Sep 04, 2008

    it should be on the frame rail, also i am not sure if this has a pump inline or in tank but check your filters for clogging and listen for the pump under the truck, your injection pump should be ok if you can prime and run it but for some reason you are lacking flow -jeff please rate

  • jeff r
    jeff r Sep 04, 2008

    pump is in the tank try smacking the tank with a big hammer also how many miles are on the truck?

  • jeff r
    jeff r Sep 04, 2008

    i also see a connector you should be able to get to to test for power and ground at the fuel pump if smacking the tank has no effect -jeff

  • jeff r
    jeff r Sep 04, 2008

    okay so it will stay running and is drivable if you prime it first?

  • jeff r
    jeff r Sep 04, 2008

    6.5-liter predecessor to this engine, had a history of failures.

  • jeff r
    jeff r Sep 04, 2008

    you need to put a pressure gauge on the truck and see if you are leaking back pressure when you shut the truck of there is a check valve probably in the pump or inline somewhere otherwise does the truck run okay on full throttle?

  • jeff r
    jeff r Sep 04, 2008

    can you get a fuel pressure gauge on the truck? these trucks run very high pressure and you are most definatly leaking pressure down when you shut the truck off this is why you are priming every start, does the truck run okay at full load ie. uphills , highyway and such?

  • jeff r
    jeff r Sep 04, 2008

    gm had a problem with these high pressure fuel pumps leaking down

  • jeff r
    jeff r Sep 04, 2008

    GM also had a problem with the fuel injector orings leaking air causing hard or no starts due to air drawing past them try spraying ether around the injectors next start, i would have to guess you are loosing your pressure though the pumps run around 350 -$400 not cheap so be sure to get the pressure specs and rule out any leaks fuel or air please rate -jeff

  • jeff r
    jeff r Sep 04, 2008

    just to clarify the in tank pump would have your check valve, the injector pump is obveously not the problem -jeff

  • jeff r
    jeff r Sep 04, 2008

    what is the status of you problem, if you shut the tuck off and try to restart it immediatly will it restart ? or does this happen after about How? long after sitting? please advise i can help you if you provide me with more information -jeff

  • Gerry Domingo Oct 23, 2012

    i just found out that the pump is not working well and the injector has only 4volt

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  • Master
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Hey Semi Expert & Mohammed387, you dont know any thing about diesel engines so don't post any solution which is beyond of your experties. Keep playing with computers and celluler phones. :|

Posted on Sep 04, 2008

  • kuben naidoo
    kuben naidoo Nov 28, 2013

    at least they are trying you should be posting something that can help not be a critic

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  • Expert
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If the injection pump isn't pushing fuel through the lines to the injectors, it may have a faulty solenoid. Listen for a "click" inside the pump when the ignition switch is turned on. No click means the solenoid and/or pump need to be replaced. If it clicks but there's no fuel coming through the injector lines (and the filter and lines are not obstructed), the pump is probably bad and needs to be replaced.

Posted on Sep 04, 2008

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The pump has gone bad and need to be changed

Posted on Sep 04, 2008

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  • Master
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I think ther is a fault in motor ...better check whether the coil burnt or not

Posted on Sep 04, 2008

  • 1 more comment 
  • mohammed marika thambi
    mohammed marika thambi Sep 04, 2008

    else check ur motor belt...it may affect due to continuous over speed

  • mohammed marika thambi
    mohammed marika thambi Sep 04, 2008

    thank u...welcomejee...check ur fuel injector..because it is used to inject the fuel into the cylinder..during suction stroke air oly drawn from the atmosphere..so better check the propeller(fan)..whether it **** in right path or not.
    mr welcomejee try to give better solution than me..ur most welcome.

  • mohammed marika thambi
    mohammed marika thambi Sep 04, 2008

    Most diesel engines have large pistons, therefore drawing more air and fuel which results in a bigger and more powerful combustion Diesel engines use compression ignition, a process by which fuel is injected after the air is compressed in the combustion chamber causing the fuel to self ignite

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  • Chevrolet Master
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Read this posting, the problem may be the optical sensor in the fuel pump unit.

  • SYMPTOM: Your 6.5L Diesel stalls just as if someone had reached over and turned off the ignition switch.
  • CAUSE: There are two main causes. The first and most common is the PMD (also called FSD). The other possibility is the Optical Sensor located in the pump itself.
  • DIAGNOSIS: OR "How do I know what to replace?" Simply put, if your check engine light is not on and you experience stalling, it is a 95+ percent certainty that you need a new PMD. If your check engine light is on, you need to get your codes checked. Auto Zone and others will do this for free. If you ONLY have codes P1216, P1217, 35, 36 or any combination of those, you need just the PMD. If you have codes P0251 or PO370, 17, 18, or any combination of those, you should consider the injection pump suspect.
  • So what is this PMD? PMD stands for Pump Mounted Driver. The same part is also called an FSD or Fuel Solenoid Driver. (One is GM terminology, the other Stanadyne terminology). It is a "black box" about the size of a pack of cards mounted on the driver's side of the injection pump.
  • !
  • Check to be sure your lift pump is running. The lift pump delivers fuel to the injection pump and is located on the frame rail under the driver's seat. The lift pump will NOT cause stalling, but when it goes bad, the injection pump runs hotter which shortens PMD life. See lift pump under products for instructions on checking the lift pump.
  • Make sure you have good clean fuel with no water
  • For the very thorough individual: Check all electrical connections - battery terminals, engine and body grounds, and all fuel injection pump wiring including the multiple grounds on the intake manifold. With the batteries disconnected open up all connections (including those at the bulkhead) and look for loose or corroded connections, but do not spread open the terminals. Take your time and look carefully for chafed wiring. One connector of particular interest is the large15-way connector near the back of the intake manifold where the main engine harness meets the fuel injection harness which then runs forward under the intake to the injection pump. This connector is commonly the site of severe corrosion, especially in northern states and may cause a variety of intermittent problems.
  • Those who are very technical and equipped with the proper tools can perform a couple more steps to ensure that they have correctly identified the issue. If the duty cycle measured at the red closure signal wire (Terminal E at the PMD) is not the same as the duty cycle measured at the light green PCM command wire (Terminal A at the PMD) then the PMD has failed. Because of the difficulty of this step and the fact that this issue is so common, only the most exacting individuals perform it.
  • If your truck over-responds to the throttle and revs up very rapidly at only light throttle application, or revs up on its own, internal injection pump wear is almost certainly the cause.
  • !

Posted on Sep 04, 2008

  • duramaxdoug
    duramaxdoug Dec 12, 2012

    Thank's for the Info.. sounds like i might have this problem good advice. Thank's

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