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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 04-15-2007, 10:06 PM   #1 (permalink)
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Priming 6.9L injector pump

My buddy has a 1987 f250 with a 6.9L diesel. We had to put a rebuilt injector pump in it. We have been trying to prime it, but nothing. Any suggestions? It's ticking us off. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 04-15-2007, 10:07 PM   #2 (permalink)
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Re: Priming 6.9L injector pump

Do you have pressure from the lift pump to IP, is the Fuel shutoff solenoid powered up.....check my gallery for pic(s)
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Old 04-15-2007, 10:24 PM   #3 (permalink)
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Re: Priming 6.9L injector pump

If you have the electrical hooked up and have fuel to the pump, just break an injector line at the back of the pump and turn it over. I have put four pumps on my truck, two of them primed right up, two of them ran the batteries dead before they primed. Sometimes they are just a PITA.
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Old 04-15-2007, 10:36 PM   #4 (permalink)
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Re: Priming 6.9L injector pump

I think we got the PITA model. LOL. I took the one year old batteries out of my 01 powerstroke and it's still having problems turning over. Number 8 injector have fuel there, but i dont think the air is totally out of it. If you any quick suggestions. let me know.
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Old 04-16-2007, 01:05 AM   #5 (permalink)
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Re: Priming 6.9L injector pump

Sorry for the late post, break loose all 8 injector lines one at a time and turn the motor over to bleed the air from the lines. Once you have fuel at all 8 injectors, the truck should start.
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Old 04-16-2007, 09:22 AM   #6 (permalink)
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Re: Priming 6.9L injector pump

Loosen the fuel return line at the top of the IP to make sure you get fuel there before loosening injectors.
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Old 04-16-2007, 09:46 AM   #7 (permalink)
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Re: Priming 6.9L injector pump

I'll give them a try today and let you know what happens. Thanks for the advice. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 04-16-2007, 10:00 AM   #8 (permalink)
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Re: Priming 6.9L injector pump

There's no need to loosen one line at a time. Loosen all 8 at the injector, it shouldn't take more than 30 seconds of cumulative cranking to get all the air out of the injector lines.

When bleeding, hold the accelerator ALL THE WAY DOWN, this gives maximum fuel flow.
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Old 04-16-2007, 04:36 PM   #9 (permalink)
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Re: Priming 6.9L injector pump

That's how I do it too. I crank for 30 sec's, get out and tighten any that have fuel. Then get in and start over. Usually, by the third time she fires up. Then you've gotta hurry up and get the line nuts tightened down. To stop fuel from squirtin all over.
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