Fuel leak in my 1993 F250 7.3 idi non-turbo - 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 05-07-2008, 02:02 PM   #1 (permalink)
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Fuel leak in my 1993 F250 7.3 idi non-turbo

Looking for some ideas on what may be leaking fuel in my 1993 F250 7.3 idi. I see fuel oil dripping on ground after driving and smell diesel in garage. Mechanics initial suggestion is to replace injection pump. However truck runs and drives strong, Appears to be leaking fuel from top of engine. Bottom of injector pump is wet and top of engine block has fuel on it. I would like a some ideas of other leak areas on this motor before I let the mechanic order a new injection pump, which it may or may not need. It is the original pump.
Thanks for the help!

1993 F-250 4x4 E4OD 7.3 IDI Non-Turbo
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Old 05-07-2008, 05:09 PM   #2 (permalink)
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Check your return line at the back of the engine. It can leak and when you turn it off you will not see any fuel coming out but it will be there.
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Old 05-07-2008, 05:15 PM   #3 (permalink)
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Check all of your return lines coming from the injectors, the filter, and the IP. This will most likely find your leak. The fuel inlet into the IP could be leaking, but it is more likely that it is the return lines.
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Old 05-07-2008, 07:14 PM   #4 (permalink)
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If the leak is from the advance arm seal it is a simple fix by a Stanadyne or any diesel IP shop.... usually done in vehicle. Check my photo link for IP pics see if you can determine where it is leaking. If you use a piece of cardboard shoved under the IP or other paper item you may be able to find the leak.... If it is center front that would be the main shaft seal........ new IP.

Check out ...... 7.3 L Ford Diesel Fuel Injectors Fuel Pumps Accessories for a possible rebuilt IP if needed.

IP bottom - TheDieselStop.Com Photo Hosting
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Old 05-08-2008, 02:12 AM   #5 (permalink)
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Originally Posted by cur.bill View Post
Check your return line at the back of the engine. It can leak and when you turn it off you will not see any fuel coming out but it will be there.
Thanks to all of you for your suggestions. I am hoping it is in the return lines and not the IP.
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Old 05-08-2008, 04:49 AM   #6 (permalink)
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The main shaft seal can also be replaced once the pump is removed. It doesn't require a pump replacement.
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Old 09-03-2008, 08:54 PM   #7 (permalink)
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Quote:
Originally Posted by cdnsarguy View Post
If the leak is from the advance arm seal it is a simple fix by a Stanadyne or any diesel IP shop.... usually done in vehicle. Check my photo link for IP pics see if you can determine where it is leaking. If you use a piece of cardboard shoved under the IP or other paper item you may be able to find the leak.... If it is center front that would be the main shaft seal........ new IP.

Check out ...... 7.3 L Ford Diesel Fuel Injectors Fuel Pumps Accessories for a possible rebuilt IP if needed.

IP bottom - TheDieselStop.Com Photo Hosting
I loved your diagram pics. Ive been looking for the locale of my injection pump to find a small fuel smell. Thanks
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Old 09-03-2008, 10:11 PM   #8 (permalink)
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Soooo many ways diesel could be at those locations, but I like to start cheap, I recently purchased a "pump kit" for $5.00 from an IP rebuild shop. It has the "cheerio" shaped seals that go where the metal line from the filter to the IP has the nuts on each end, and where the return lines come together at the rear of the engine.
It also has an O-ring that goes in after you remove that metal line on the back of the pump and then remove the next nut, it, believe it or not has an O-ring in there (I didn't believe it till I saw it). Also maybe any of the injector lines at the pump could be loose.
You can get everything pretty clean with compressed air, and then you should be able to see where it is coming from, maybe try spraying a solution of water and laundry detergent with a squirt bottle and then compressed air to get it real clean.
Sounds like it's leaking fast enough to see.
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