fuel problems - Ford Powerstroke Diesel Forum
6.9L IDI Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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post #1 of 11 Old 05-18-2009, 07:34 PM Thread Starter
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fuel problems

i have an 86 6.9 and it has ran great for me
today it started idling rough and when i drive it would be a dog and then crank way up then it would idle fine and then go back to choppy idle i think it may be the fuel pump and/or the fuel lines and filter
anyone know what if might be
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post #2 of 11 Old 05-18-2009, 07:56 PM
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Check that fuel pressure!!

1997 F-350 Her name is Kimberly
Full 4" Farmboy Diesel Straight Exhaust, Homemade Intake, 17* HPOP, EGT, Boost, and Fuel Press. Gauges, HPOP X-over, RDS Stage 2s (Thanks Matt P), TW Chip, South Bend Dual Disc Clutch, DieselSite CPR Fuel System, Hypermax Intercooler
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post #3 of 11 Old 05-18-2009, 08:24 PM Thread Starter
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how?
i was just gunna put a new fuel line on since the one the previous owner put on is all messed up and since i was gunna do that i was gunna put on a new fuel pump since theyre only
$30

Last edited by SCUFFY828; 05-19-2009 at 05:27 AM.
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post #4 of 11 Old 05-19-2009, 01:28 AM
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IIRC on the 6.9 there is a place to put a fitting in the valley of the motor on the driver side attached to the fuel lines coming into the bowl.

1997 F-350 Her name is Kimberly
Full 4" Farmboy Diesel Straight Exhaust, Homemade Intake, 17* HPOP, EGT, Boost, and Fuel Press. Gauges, HPOP X-over, RDS Stage 2s (Thanks Matt P), TW Chip, South Bend Dual Disc Clutch, DieselSite CPR Fuel System, Hypermax Intercooler

Last edited by SCUFFY828; 05-19-2009 at 05:28 AM.
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post #5 of 11 Old 05-19-2009, 05:23 AM Thread Starter
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shouldnt i just plan on changing the pump since its only $30 and its prolly the original pump
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post #6 of 11 Old 05-19-2009, 05:29 AM
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first rule of any repair is to do proper diagnosis before replacing any part , make sure you have good fuel pressure 5-8 lbs to be exact will run the truck fine , no need to buy parts that arent needed

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post #7 of 11 Old 05-19-2009, 05:30 AM
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For $30 if its was the original I would replace it anyway!

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

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Thanks. I'll give er a good wackin in the morning.
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post #8 of 11 Old 05-19-2009, 05:32 AM
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For $30 if its was the original I would replace it anyway!
why replace a part there may be nothing wrong with , 30 dollars is 30 dollars

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post #9 of 11 Old 05-19-2009, 05:59 AM
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doesnt the 6.9 have a fuel bowl similar to the 7.3? same basic setup right?

1997 F-350 Her name is Kimberly
Full 4" Farmboy Diesel Straight Exhaust, Homemade Intake, 17* HPOP, EGT, Boost, and Fuel Press. Gauges, HPOP X-over, RDS Stage 2s (Thanks Matt P), TW Chip, South Bend Dual Disc Clutch, DieselSite CPR Fuel System, Hypermax Intercooler
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post #10 of 11 Old 05-19-2009, 05:59 AM
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why replace a part there may be nothing wrong with , 30 dollars is 30 dollars
I know but I just tend to replace stuff when it is really old or has a lot of miles on it. Too many times of being stranded because something suddenly and inexplicably broke or gave out!

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

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