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Old 07-24-2009, 03:31 PM   #1 (permalink)
xtrooper89
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Looking for some help near virginia beach, va

I have a stall issue with my 90' model 6.2. When it is cold, usually after sitting all day at work or over night, the truck will start instantly, then stall. you then have to hold the pedal to the floor and turn it over for a while. guess till the lines or pump fill up with fuel. I think I have leaking injectors. Input on this issue would be greatly appreciated. This is my first 6.2, so I don't have much experience with it.


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Old 07-24-2009, 10:55 PM   #2 (permalink)
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Sounds to me like the oil pressure switch isn't letting the electric fuel pump kick in... your injection pump then has to pull fuel all the way from the tank. Or, the pump itself may be faulty. It's on the driver's side inside frame rail. The fuel pump relay is under the black plastic "T" cover on the passenger side firewall by the coolant reservoir... sometimes you can manually jumper the relay with the engine off to see if the fuel pump runs.

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Old 07-25-2009, 01:23 AM   #3 (permalink)
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I dont hear the pump run when I first turn the key on, only after it wont start initially. thanks for the input. I will check it in the am. oil pressure is usually above 40 psi when running.

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Old 07-26-2009, 12:34 AM   #4 (permalink)
xtrooper89
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The Electric Pump does indeed run, but is it suppose to run when you initially turn the key on? Like a regular gasser fuel injected does when it is priming?

Last edited by xtrooper89; 07-26-2009 at 12:34 AM.
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Old 07-26-2009, 03:41 PM   #5 (permalink)
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I don't believe so. I think the engine starts and runs off the fuel in the injection pump and lines until you build up enough oil pressure to close the pressure switch. This would explain your "start, then stall" behavior... apparently that OPS is problematic on the late 6.2 and all the 6.5 engines. If you do a search you can find out where it is and how to change it.
Also, I think the OPS is separate from the oil pressure sending unit for the gauge. Hope this helps.
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Old 08-31-2009, 10:34 PM   #6 (permalink)
xtrooper89
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Well, turns out it was the leaking filter assembly. I recently swapped it for a cummins canister fuel filter assembly. Now the truck runs and starts like a champ. Thanks for the responses though. Just drove the truck on a 500 mile trip and had no problems. actually got 22 mpg.
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