Duramax won't start...shutoff switch somewhere? - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 12-09-2012, 09:14 PM   eBay Motors  #1 (permalink)
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Duramax won't start...shutoff switch somewhere?

I have a 2003 chevy hd truck. The other day my truck turned off while the truck was idling. I noticed a coolant leak and indeed one of the heater hoses had bursted allowing the coolant to drain. I was observing the temperature gauge and the truck never overheated. I was told that the truck has a water level switch that once it detect low coolant level will shut off the engine.

Since then I replaced the hose, filled it coolant and attempted to start it. The truck still will not start. I did some further troubleshooting my priming the fuel pump, disconnecting the battery allowing time for the computer to reset. However after the troubleshooting the truck still will not start.

A colleague said it seemed that fuel is not being supplied to the engine. Do these trucks have a fuel cutoff/reset switch? If so where is it located? Any help on this matter will be greatly appreciated.
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Old 12-09-2012, 10:24 PM   eBay Motors  #2 (permalink)
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Re-prime your fuel filter, start by cracking the bleed screw, then pump away till you see diesel, close the bleed screw, pump the primer again, should get hard to pump. If not, you have a air leak somewhere in your fuel system...
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Old 12-09-2012, 10:46 PM   eBay Motors  #3 (permalink)
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no such switch fuel wise, or coolant wise(I may be wrong) so your primer pump button, was it stiff or was it soft
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Old 12-12-2012, 06:55 PM   eBay Motors  #4 (permalink)
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I attempted to re prime the fuel system. The primer pump button did get stiff. I performed the troubleshooting below:
1. Check all connections from the FICM.. all connections checked out
2. Check all fuses... a couple were blown, they were replaced.
3. Replaced the fuel filter. Checked the fuel filter seals and hardware for damaged such as cracks that could lead to air leaks. Everything looked to be in good condition.

The truck still will not start. At this point in time I believe there are two possible culprits which includes fuel injectors or the fuel pump. Both of which are extremely pricey. Do you'll know a procedure to troubleshoot these component(s). A friend (diesel mechanic) is coming over tomorrow with specialty testing equipment which hopefully will pinpoint the faulty component(s).

Thoughts?

Thanks
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Old 12-12-2012, 08:20 PM   eBay Motors  #5 (permalink)
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Old 01-14-2013, 08:18 PM   eBay Motors  #6 (permalink)
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im having same problem with my 01 if u have figured urs out let me know i need help thanks....
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Old 02-09-2013, 05:30 PM   eBay Motors  #7 (permalink)
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Okay...the bad news...my truck still will not start.

I checked the fuel lines (see picture) and one of the lines in unterminated. Should this be terminated or plugged? Could this be introducing air into the system not allowing my truck to start?



Looking ahead if this not my issue I will continue with the following. I'm looking for input/guidance in my troubleshooting.

1. Pressure testing the fuel system and checking for leaks. I read a post where peeps suggested to install a specialty cap with a shredder valve in order to pressurize the system to 8 psi. Once it's pressured up then take water and put in fuel line termination to check for leaks. Has anyone done this in the past? Is there any chance of damaging anything? Thoughts?

2. Check the fuel pressure in the fuel rail assembly. I would like to put an inline gauge on one of the fuel lines and the fuel rail, then crank the truck and check the pressure. What is the specification on the pressure that I should obtain? If the pressure is below spec does this mean a bad fuel pump? I would also like to test my fuel pressure regulator. Is there a way I can do this while installed on the truck. Perhaps it' s best if I remove the fuel pressure regulator and bench test it. How do I bench test the fuel pressure regulator? I have a snap on versus scan tool....any suggestion on which parameters to check with the scanner?

!!!!!!!!!
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Old 02-09-2013, 05:42 PM   eBay Motors  #8 (permalink)
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Don't put water in your fuel lines. Connect everything, fuel system wise, pressurize the tank with a shop vac, look for leaks. If no leaks are found, crack open the bleeder screw ( with shop vac still attached) you should get fuel at the bleed screw.
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