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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 11-09-2012, 09:56 AM   #1 (permalink)
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How to prime???

I just put my 7.3 IDI into my new truck and I'd like to be able to prime the fuel lines without draining my batteries and having to keep charging them.
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Old 11-09-2012, 09:57 AM   #2 (permalink)
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Also was wondering how to overrun my park/neutral safety switch (ZF5 tranny).
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Old 11-09-2012, 10:26 AM   #3 (permalink)
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As long as the fuel delivery and return systems are intact, there is no reason to prime. My truck can sit for 2 weeks and still start within 2 seconds.
As for bypassing the clutch switch, you just have to jumper the wires, I don't have a clutch so I'm not sure which ones. LMJD know I think.
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Old 11-09-2012, 10:27 AM   #4 (permalink)
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You can swap to a racor filter head/bowl that has a primer pump

you can add a primer pump, e.g. from a diesel mercedes, you need the part the pump screws into, not just the pump part itself

You can remove your filter, and fill it with fresh fuel. Which is what we normally do.

Hmm, edit, I assumed you meant you installed a new engine

As chuck says, you shouldn't lose prime. There's lots of opportunities for leaks in the fuel system, though.
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Old 11-09-2012, 10:35 AM   #5 (permalink)
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The switch on the clutch pedal. Just unplug and make a spaded jumper.
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Old 11-09-2012, 11:04 AM   #6 (permalink)
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The red w/blue stripe wires at the clutch pedal switch are the ones you need to jumper. The other 2 are for the cruise control if present.
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Old 11-09-2012, 11:05 AM   #7 (permalink)
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Quote:
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The switch on the clutch pedal. Just unplug and make a spaded jumper.
There's more to it than that. Most have cruise control and there'll be two speed control cutout wires at the switch too. Can't recall the color codes but what's what can be determined with a test light.
Looks like Phil and I posted at the same time. Great minds think alike.
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Old 11-09-2012, 11:08 AM   #8 (permalink)
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Oh, perfect, thank you guys. Appreciate the help
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Old 11-09-2012, 11:11 AM   #9 (permalink)
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So just butt connect them together. And its as simple as that.
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Old 11-09-2012, 11:24 AM   #10 (permalink)
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what is youre NEW truck?
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Old 11-09-2012, 11:29 AM   #11 (permalink)
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So just butt connect them together. And its as simple as that.
Perfect, just wanted to check before I started connecting wires
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Old 11-09-2012, 11:30 AM   #12 (permalink)
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what is youre NEW truck?
Its a 1997 F350 that had a 460 with an auto tranny, so I took the 1992 7.3 IDI and ZF5 out of my wreaked truck and just in the process of buttoning everything up on it
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Old 11-09-2012, 02:09 PM   #13 (permalink)
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So are you only trying to prime for that initial start after installing the 7.3?
Or are you worried about losing prime routinely?
Interested to hear how your project works out.
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Old 11-09-2012, 02:28 PM   #14 (permalink)
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My first thought would be to install the FF topped off with fuel, then crack the injector lines to bleed the air. Cracking the lines is what I did a couple times while getting the feel of where my tank pick-ups bottomed out.
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Old 11-12-2012, 08:59 PM   #15 (permalink)
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So are you only trying to prime for that initial start after installing the 7.3?
Or are you worried about losing prime routinely?
Interested to hear how your project works out.
Yea just the initial prime. I was thinkin today cause I just put the fuel sending unit in the old gas tank and it doesnt look like it sits how the fuel tank does on the diesel so it might not have been picking up the little bit of fuel I had in there either.
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