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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 11-18-2012, 10:48 AM   #1 (permalink)
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Completely lost

I have an 89 super cab F-350 2wd 5-spd with the 7.3, and I have been racking my brain trying to chase rabbits with this thing. First it was the over heating, then the alternator, then the glow plug controller, now I think I'm not getting enough fuel.. It cranks up easy, idles like a brand new one, but when I start driving it, the truck starts running really rough, it gets that "hard diesel sound" then it starts shaking really bad then I loose power until it cuts off. When I try to start it again, it acts like its out of fuel for several mins. I have replaced the fuel filter, I have bled the valve on top of the filter, and diesel pours out, never any air. So now I don't know where to look, this truck is all stock no mods at all with 73000 miles on it, if I can get it running 100% then I will start adding fun toys and parts to it but until then... I lost!
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Old 11-18-2012, 12:32 PM   #2 (permalink)
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test lift pump

remove shrader core from test port on filter head, run a line into a jar
1/3 pint or more after 10 sec. cranking
then hook up a pressure gauge, 4-6 psi within 10 sec. cranking

if either test fails, replace the lift pump

If not, your injection pump could well be going; no start while hot is a common symptom.
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Old 11-19-2012, 01:29 AM   #3 (permalink)
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How do I test the injector pump?
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Old 11-19-2012, 06:53 AM   #4 (permalink)
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you can't without a test bench. only a fuel injection shop can do that. ditto for injectors, although you can build a test rig out of a port-a-power.
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1982 MBZ 300SD W126 California model w/Sunroof, no EGR
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Old 11-20-2012, 04:48 PM   #5 (permalink)
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So today I thought to switch from the rear tank to the front, and I babied it up and down the block a few time, no problems, then I picked up the pace until I was driving it like some sort of hotrod... Still no problem, so I think that it may just be a problem that's isolated to the rear tank, any ideas?
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Old 11-20-2012, 05:41 PM   #6 (permalink)
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How much fuel is in the tank(s). The pick-ups breaking off are a known issue and can give you no fuel symptoms at about 1/4 tank. Another possibility is the selector valve not fully seating in one direction.
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Old 11-20-2012, 09:49 PM   #7 (permalink)
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I'm not sure as to how much fuel is left in the rear tank, I do know that I have been running off of it for a while... So it sounds like I need to pull the bed and check out the pick-up , and maybe the sending unit...
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Old 11-23-2012, 08:52 PM   #8 (permalink)
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Is there a kit to replace the two tank setup with one single (larger) tank? Or has anyone fab'd one?
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Old 11-23-2012, 09:40 PM   #9 (permalink)
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You can just run fuel lines from the tank of your choice, just bypass the selector valve. Make sure you bypass both the delivery side and the return side.
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1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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Old 11-24-2012, 07:41 PM   #10 (permalink)
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Not a bad idea, what does the fuel pick up look like, is it just a line run to the bottom of the tank right? Also, how do you tell if the brake booster is going out or if it's the vacuum pump?
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Old 11-25-2012, 10:13 AM   #11 (permalink)
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the pickup foot is a ridiculous goofy piece of rubber with a bypass valve installed in the side of it that will eventually disintegrate and cause problems, with massive holes in the bottom.
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1982 MBZ 300SD W126 California model w/Sunroof, no EGR
1997 Audi A8 Quattro 225k Warm/Cold packages
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