1992 Ford F Super Duty 7.3 IDI fuel system issue. - Diesel Forum - TheDieselStop.com
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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 03-24-2013, 08:50 PM   #1 (permalink)
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1992 Ford F Super Duty 7.3 IDI fuel system issue.

Hi, thank you for reading. Any help would be appreciated.

I recently purchased a 1992 Ford F Super Duty bucket/boom truck with the 7.3 IDI motor in it. When I switch to the rear tank via the dash switch the engine runs for a couple minutes then stalls an refuses to start. Upon switching back to the front tank it cranks fires and runs flawlessly. I have very little experience with Diesel, but I am mechanically inclined.


Thank you for reading, and again, any info that you can offer.

The truck has 210k miles on it, if that means anything.
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Old 03-24-2013, 08:58 PM   #2 (permalink)
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1992 Ford F Super Duty 7.3 IDI fuel system issue.

Welcome to the Diesel Stop.
Two things come to mind here. Either a sticky tank selector, or a broken pick-up in the rear tank.

How much fuel is in the rear tank? If it has 1/2 tank or more, then more than likely the selector is sticking. They are replaceable, but if I remember right you have to modify the fuel lines to attach them. Some members have succeeded in taking them apart by drilling out the rivets, and using machine screws to put it back together.


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Old 03-24-2013, 09:11 PM   #3 (permalink)
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Originally Posted by chuckster57 View Post
Welcome to the Diesel Stop.
Two things come to mind here. Either a sticky tank selector, or a broken pick-up in the rear tank.

How much fuel is in the rear tank? If it has 1/2 tank or more, then more than likely the selector is sticking. They are replaceable, but if I remember right you have to modify the fuel lines to attach them. Some members have succeeded in taking them apart by drilling out the rivets, and using machine screws to put it back together.
O

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What part am I searching for the switches between tanks? Not the dash switch I'm assuming. Is it a Fuel Pump Relay?

Ok sounds fairly straight forward. I guess my best bet is to replace the tank selector. The rear tank is 100% full. So I'm hoping its te selector. I'll be sure to update when I solve the problem.

Last edited by Buckeyedatajaxllc; 03-24-2013 at 09:16 PM.
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Old 03-24-2013, 09:21 PM   #4 (permalink)
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1992 Ford F Super Duty 7.3 IDI fuel system issue.

The tank selector is a valve usually mounted on the frame. It has 4 lines I believe, a supply and return for each tank. The internals will move allowing fuel lines to "line up" and let fuel flow/return to the selected tank.

Foreign material can lodge and hinder the full movement of the internals.


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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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Last edited by chuckster57; 03-24-2013 at 09:24 PM.
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Old 03-24-2013, 09:27 PM   #5 (permalink)
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Originally Posted by chuckster57 View Post
The tank selector is a valve usually mounted on the frame. It has 4 lines I believe, a supply and return for each tank. The internals will move allowing fuel lines to "line up" and let fuel flow/return to the selected tank.

Foreign material can lodge and hinder the full movement of the internals.


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Sounds like something I can replace in my driveway if I can disconnect it and clean/replace the selector.
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Old 03-24-2013, 09:32 PM   #6 (permalink)
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1992 Ford F Super Duty 7.3 IDI fuel system issue.

It is an easy repair. As I write this, one other possibility comes to mind. A plugged fuel line from the rear tank. Easy check is to disconnect both the supply and return lines at the selector valve and blow low pressure air through them.


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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

PM please not visitor message
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