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Old 04-15-2012, 09:58 AM
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Electric fuel conversion questions

I am upgrading my 94 f350 to electric fuel. I have an airdog 150 feed pump and a super duty high pressure pump (temporary) to feed it. I would like to eliminate the banjo bolt and feed the heads from the front and return in the front. My questions are:
1-I don't know how the fuel feed is from the factory. Is my thought of front to rear ok?
2-does anyone know what fittings are in the head for the fuel lines? I'd like to run AN fittings with braded line.
3-anything I may also need to add?

The truck is a 94f350 4x4 dually with a powerstroke and a zf5 trans with a gear venders under drive auxiliary trans. Other mods are:rosewood stage 1 injectors, t500 HPOP, calling DP tuners tomorrow for a chip, inter cooled, dual disc clutch and a rebuilt stock bore motor. I didn't intend on rushing this together, but I own a small landscaping company. My first day of work,April 2, we were rearended in front of a customers house which totaled everything including my 96 f150. Instead of replacing the truck I figured I'd finish the f350.
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Old 04-15-2012, 10:01 AM
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If you're making the rails flow through, feed direction doesn't matter.
Strictly Diesel's RR kit feeds into the front, away from turbo heat.
Why use two pumps like that in series? I always thought the AD worked like a stock pump and pulled it out of the tank and up to the fuel rails. You could use just the stock SD pump (it's not high pressure, just normal fuel pressure), but then you'd have to add your own filtration.
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Old 04-15-2012, 10:14 AM
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The airdog is only 10psi and was ment to feed the super duty pump. All came from a buddies wrecked 01 super duty. Forgot about about the fuel pressure regulator too. What is the ideal psi I'd want? My truck was around 50 if I remember right.
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Old 04-15-2012, 10:15 AM
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Let me add to this, if I don't need both pumps please let me know. That's less headaches.
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Old 04-15-2012, 10:15 AM
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Oh I gotcha. So the AD is kinda like a feeder?
But either way, the SD pump doesn't need a feeder. Up to you.
Some trucks run better at 60, some better at 70.

As for both pumps, the SD doesn't need a helper, like I said. But if you run just the SD, you need some filtration to go along with it, assuming you're deleting the fuel bowl.
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Old 04-15-2012, 10:22 AM
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That's the way I understand it, airdog feeds the factory pump with air free fuel. I am deleting the bowl.
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Old 04-15-2012, 10:24 AM
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Do you understand the stock design of the fuel rails? Dead head. So any air getting in will be forced to the last injector.
Fixes - Improve your pickup tube. Prevents a lot of air from getting in.
Do a RR like you are. Any air will flow past the injectors and back to the tank.
Do those two or even just the RR and you'll be good and don't need the AD.

With no AD filters, you'd have to do a pre pump filter and a post pump filter.
There's a lot of write ups for both body versions of the 7.3 on which filters and ideas on how to do it all.
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Old 04-15-2012, 10:43 AM
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I have a general idea of the 7.3 rails. I did not know about the last injector getting the air. Since I have the air dog and super duty pump, I think it would be easier than modifying both pick up tubes. Although, maybe the tube mods may also help and be a future mod
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Old 04-15-2012, 10:46 AM
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Doing pickup tubes doesn't sound bad. Drop tank, and just replace with a tube instead of the whole foot in there.
Like I said, up to you.
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Old 04-15-2012, 10:49 AM
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Do you have any knowledge on the fittings? Are they NPT into the head?
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