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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 09-01-2008, 10:40 PM   #1 (permalink)
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truck wont start after sitting

91 7.3 non turbo. Truck wont start after sitting for more than 6-8 hours. Has to have a shot of ether. Brand new motorcraft gps, voltage at the gps, relay is clicking, fresh alt. I am using jumper cables from my cummins dodge to get enough power. I can crank all day, and nothing happens.

Where should i go next.
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Old 09-02-2008, 03:53 AM   #2 (permalink)
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Does if fire once then die and won't fire again? Or dies it NOT fire at all after sitting?
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Old 09-02-2008, 11:57 AM   #3 (permalink)
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it does not fire at all. runs fine once it has been run for a little while.
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Old 09-02-2008, 01:49 PM   #4 (permalink)
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Sounds like an air/fuel leak. All that cranking will eventually bleed the air out of the fuel system and it will run. Once you park it for a while.....air leaks back in and you have the same problem.

The most common site for air/fuel leaks tends to be the injector fuel return caps/lines. However, a fuel leak can occur anywhere in the system.

Heath
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Old 09-02-2008, 01:51 PM   #5 (permalink)
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Air in the fuel will usually give you an immediate fire and then die. Any visible leaks around the return lines?
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'90 E350 7.3L Ex-Ambulance High Top 420K Miles, No Turbo, Stock Stock stock, No ELC! (Extended Life Coolant) & 10 Oz. Bars Stop Leak. 10 wonderful cool years using Freeze12 without any AC system modifications. Retired 11/8/2011 with blown trans.


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Old 09-02-2008, 04:30 PM   #6 (permalink)
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stick a clear piece of tubing from the top of your IP to the return line. That will let you see if you have air in your lines or not. I don't think thats your prob tho like Snotzalot said.
I'd check your starter. Maybe its not turnin fast enough. Most non starts I hear of are either air in the return lines, not enough battery juice to the starter, or starter is bad. Last two cases the starter may still spin but not fast enough.
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Old 09-02-2008, 04:39 PM   #7 (permalink)
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Here's a simple test:

While someone else cranks it over, open the shraider valve on the filter head. If you get bubbles or air, but not a stream of fuel, you have an air leak.

I've had several fuel/air leaks in the past with hard starting. Mine never started then died. It just wouldn't until the air bleed out of the system. For others, they have a start then die symptom with an air/fuel leak.

Heath
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1986 F250HD 4x4 7.3L IDI '95 PSD front clip, '97 bed, T19, D60/10.25 with 3.55's. Rebuilt from the frame up. Banks Turbo, DPS IP & Stage 1's, Isspro TTM, Banks Exhaust, Boost gauge, Pyrometer, Precharged Coolant Filter, Holley Red Pump. 16.5 x 37 x 12.5 Goodyear Wrangler's, Air Horns. 6in lift, Fresh Paint, On-board Air. Revamped Interior. Rhino Liner.

1983 F250 4x4 5.0L with C6. 340,000+ miles.

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