Although they will leak as described I dont think the return lines will cause your issue. My son has a 92 7.3 IDI with only 52K miles and after you check it over thoroughly for air leaks and fuel pump problems here are some other things to check. We constantly had troubles with the filter water separator leaking and thus causing air in the fuel problems until we junked the OEM type filter cartridge and bottom cap and replaced it with a one piece spin on filter that threads to the OEM base. This conversion element is available from NAPA. If local store cant find the part number I can get it for you. Even if this isnt your current issue it will be at some point and the conversion filter element works great. Since you have 6.2 GM experience you probably know this but a symptom of those rotory pumps going bad is exactly as you describe. The governor ring deteriorates and plugs the return fitting and when the case is pressurized the pump cant work. This may be why it starting leaking, probably out the timing window. If this is your issue the truck will start back up after a few minutes and act fine but soon loose power and die again.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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