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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 04-23-2011, 05:41 PM   #1 (permalink)
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7.3 idi wont start

I have a 92 f250 7.3 idi. It would not start here about two weeks ago and i ended up replaceing the injection pump. It started right up and ran great for 4 days and then it died as i was driving. The motor got quite a bit louder after the new pump was installed. I was wondering if it could possibly be the fuel pressure solenoid?
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Old 04-23-2011, 11:42 PM   #2 (permalink)
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I dont think the idi has any fuel pressure soleniod. You may be thinking of the fuel shutoff soleniod (FSS), check it for current or crack the injector lines to see if fuel comes out as the engine cranks. What do you mean that the engine got louder? Did it surge & get real rough? If thats the case then your sucking air from someplace.
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Old 04-24-2011, 04:44 AM   #3 (permalink)
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Is the selected fuel tank at or near 1/4 tank............... switch to one with more fuel see if problem still remains......
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Old 04-24-2011, 08:59 AM   #4 (permalink)
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I meant the fuel shut off soleniod. Ive crack the injector lines as i was cranking it over and im not getting any fuel past the injection pump. When i said the engine got louder it seems like it knocks but at the same time the engine seems to be running smoother if that makes any sense what so ever. When it died it did not surge or run rough before it died. What do you guys think it could be?

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Old 04-24-2011, 09:55 AM   #5 (permalink)
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usually FSS inhibits starting, but if you had a wiring fault to the FSS it could shut off during runtime.

are you getting fuel TO the IP?

Try jumping +12 to the FSS connector (e.g. with a test light) and see if it clicks.
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Old 04-24-2011, 09:58 AM   #6 (permalink)
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Ya im getting fuel to the injection pump but not to the injectors. Where is the FSS located?
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Old 04-24-2011, 10:17 AM   #7 (permalink)
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The FSS is the first thing in the IP from the standpoint of fuel flow. It's right behind the inlet from the lift pump. Sometimes they stick if you get enough crud in there.
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Old 04-24-2011, 10:25 AM   #8 (permalink)
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So it is the plunger that is just in front of the IP?
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Old 04-24-2011, 10:44 AM   #9 (permalink)
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hmm, now I look again, it looks like it's in the top. here, let me suggest some reading.

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Old 04-24-2011, 11:01 AM   #10 (permalink)
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I will look into the information you gave me and see what i come up with. Thanks for all your help with this problem. I will post if i have any other questions and or concerns thanks again.
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Old 04-24-2011, 09:10 PM   #11 (permalink)
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Quote:
Ive crack the injector lines as i was cranking it over and im not getting any fuel past the injection pump.
There will be a very small amount of fuel emitted at an open fuel line at cranking speed. At idle there would be considerably more and under a higher pressure. Wear eye protection!!!!
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Toys: 2006 37' Triple E Embassy coach (powered by Cummins), 18' Sylvan Pro Fish with Mariner motors.

Proud Canadian BOOB man too!!

Please PRIVATE MESSAGE only!! ...
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