Question about 2000 Chevrolet 3500

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2000 chevy 3500 will not crank after being run and shut off.

I am having a problem with my 2000 chevy 3500 dually. It has a 7.4 liter with auto trans. If the truck has been sitting for a while it will start and run fine, but if I stop and shut it off, it will not start back up unless I let it sit for a long time. I have pulled a spark plug when this happens to see if it is firing and it definitely has spark. I also sprayed starting fluid into the throttle body during one of these events to see if that would do anything. The truck tried to start when the starting fluid was sprayed. This lead me to believe that there was a fuel delievery problem....but where and why would it run fine until it is shut off? Any ideas or suggestions would be greatly appreciated.

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  • 6 more comments 
  • fnlyfree May 27, 2009

    I have changed the fuel pump relay with a new one. It did not seem to help. I made the change during an episode when the truck would not start and still no dice.

  • fnlyfree May 28, 2009

    I have replaced the fuel filter and still have the same trouble. Today something new happened. Usually after the truck sits for a while, it will start even though it is sometimes a hard start. Today, I tried starting it after had been sitting for about 3 days. It would not start at all. It turned over and had spark but would not fire up. I left it alone for about 2 hours until I had time to work on it. It decided to try to start it and low and behold it fired up. I let it sit and idle for about 10 minutes, shut it off, waited about 5 minutes and it started up again. I tried turning it of and starting it a couple more times, and it began to stumble to a run and finally it died and would not start again. I disconnected the line to the fuel filter to see if there was fuel. There was fuel and it had pressure on the line. I left the line disconnected and tried to start the truck hoping to test the fuel pump, but I got nothing. Should there be flow even if the truck is not running since I had relieved the pressure on the line? I reconnected the line and tried to start. Nothing. It seems that the fuel pump may be running intermitantly. ???Not sure about that though. How would I test the fuel pump?

  • fnlyfree May 28, 2009

    I forgot to mention that I also ran a scan on the ECM and there were no trouble codes. I really appreciate your help with this.

  • fnlyfree May 29, 2009

    Thank you again for an obvious check suggestion. I'll do that today. I hope that i feel like an idiot and find out that it is the ground. lol. Those pumps cost about $300. Thanks and I'll let you know what happens.

  • fnlyfree May 30, 2009

    I tried to check the ground but had some trouble finding it. I found a ground strap that connects to the filler neck, but nothing from the tank yet. It was getting dark when I checked it, so I will look again when the sun is out. Also, the last few times that I have tried to start the truck, it would not start at all. I can't hear the fuel pump running as I shut the switch off like most of the time. Usually when I shut the key off, I can hear the fuel pump run for a second. Hopefully I will find something soon. I am off to check for the ground. Thanks again.

  • fnlyfree May 30, 2009

    OK Marty, I found a ground wire attached to the top of the frame rail. I removed it and cleaned the area around the hole the bolt and the wire terminal. However, when I removed it, the connection was very clean and I did not see any reason that it would not be grounded well. After all that, I tried starting the truck. It would only spin over and over without hitting at all. When I turned the key on and off, I never heard the fuel pump come on. It sure seems like the pump may be bad. Is there any way that the fuel pressure regulator could have something to do with this? Over the past several months, my truck has been difficult to start after driving for a while then letting it sit for 30 min to an hour. It always started though. The funny thing is that if the truck was allowed to sit for several hours, it would start right up without hesitation. Also, during the times when it was difficult to start, as it did start up, there would be some black smoke from the exhaust as if it were running rich or flooded. The smoke only came out on the start up and then cleaned up. I was told that the fuel pressure regulator could be causing the hard starts and the rich condition if the diaphragm inside were busted allowing fuel to be pulled into the vacuum line. Now the problem has changed from hard starts to no start. I only drive the truck if I need to haul something or pull my boat which is probably 3 -5 times per month. So, it sits for days without being started but usually fires up. I am still at a loss and would like to avoid spend money on parts that I don't need to replace. Do you have any other ideas that I should try before replacing the pump? Thank you,

  • fnlyfree Jun 02, 2009

    Thanks for your help Marty. I plan to change out both the pump and the regulator this weekend.

  • fnlyfree Jun 09, 2009

    Marty, I thought I would let you know that I replaced the fuel pump and the truck started right up and ran fine. It was a pretty big job for one person, but not too bad. I appreciate your help and suggestions for troubleshooting.

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  • 76 Answers

Hello, i hope this helps, it sounds like an open relay (bad relay). try swithcing fuel pump relay with AC relay and retest..if no sucess, feel free to reply and ill try to E-DIAGNOSE it for ya...lol.......good luck, marty

Posted on May 27, 2009

  • 3 more comments 
  • MARTY
    MARTY May 28, 2009

    hi again, sorry that did not help........have you replaced the fuel filter? that is maintanance that should be done, fairly cheap and fits the symptoms....marty if no, i can send a diagnostic flow chart too you

  • MARTY
    MARTY May 29, 2009

    hi, the best way to test the pump is to turn key to on, measure fuel pressure at tank end of filter if possable....however it kinda sounds like it may be the usualy CHEVY BAD GROUND, lol, the ground for the pump attatches to the frame near the tank, try removing gound, clean the connection area and reconnect........let me know, bad pump is still a possability, but check the ground first! those pumps are expensive...good luck, marty

  • MARTY
    MARTY Jun 01, 2009

    it sure sounds like the pump, im sorry to say, the regulator is common may also be bad, pull the vacuum line off the regulator, check to see if any signs of fuel exist in line, if so, replace regulator. it really acts like a pump! good luck....ps if not in a big rush, you can find the pump alot cheaper on internet w/ free shipping..marty

  • MARTY
    MARTY Jun 02, 2009

    hi, good luck! I sure hope this has helped, if there is anything down the road feel free to call 541-815-6508 marty

  • MARTY
    MARTY Jun 09, 2009

    hi, congradulations....im glad your weeklong hastle has come to an end.lol.........have a great summer.marty

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