few questions related to the injector pump/ vacuum pump - Diesel Forum - TheDieselStop.com
6.9L IDI Diesels (Not Power Strokes) 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 3 (permalink) Old 06-07-2005, 06:01 PM Thread Starter
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few questions related to the injector pump/ vacuum pump

first of all, my truck hasnt been running this well in 2 years, or even running at all as a matter of fact. i recently set up the injector pump and switched thermostats. the injector has that nice brasss fitting on it that is connected to what looks like a limiter thing that goes directly into the injector pump. when i took the little limter thing off it wasnt letting any fuel through the line and causing the engine to stall out or run very weak. so i cleaned it all out and whatnot and the truck starts right up when warm or plugged in for about half an hour (glow plugs cycle causing burnt out plugs) because all the glow plugs are bad. but when i start it up for the day, it smokes white, but when it warms up, no white smoke. and while under a load, it smokes black.

ive heard too many cases of a bad injector pump and smoking white and wanted to find out for sure if this is just a warm up thing or something to worry about.

now on to the vacuum pump. i know it helps the truck shift, but i think mine is going out possibly because im at ~2700 rpm's before the truck will shift and it shifts quite hard. i dont know where the pump is located but i was wondering if this is a vacuum pump issue or a transmission linkage issue.

thanks for reading

'85 F-250 that gettin the lovin it needs...

Rusty Red (aka 1985 F-250 XLT Lariat 4x4)
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post #2 of 3 (permalink) Old 06-07-2005, 07:57 PM
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Re: few questions related to the injector pump/ vacuum pump

the hard shifting may be caused by a faulty transmission modulator. I had the same problem and asked the diesel gods for help, and after replacing the modulator. my 86 shifts so smooth i almost think something is wrong. you should be able to pick one up at your local auto parts store. If you are having problems with your vaccum pump, you would notice that the brake would be more spongee and weak feeling, start with the modualtor and go from there

matt [img]/ubbthreads/images/graemlins/smokin.gif[/img]

1986 Ford F-250 XLT styleside, 6.9 stock engine, 154,000 miles,3.05 gears and a trusty c-6 transmission, interior is trashed,paint is fading quick and the electrical system is got widgets.
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post #3 of 3 (permalink) Old 06-07-2005, 09:51 PM
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Re: few questions related to the injector pump/ vacuum pump

the vacuum pump is located under the alternator. look at the alternator and there is a small belt running vertically down to it.

1988 F-350 srw, Crew Cab, 2WD, 7.3L, Rebuilt C6, 4.10 Rear, Manual GP Switch, No Soup Bowl. Getting a 3.08 Rear Soon.

ASE Master med/hvy Truck Technician
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