Donald Lehman

Well-known Member
whole afternoon fooling around with the dang dump truck. Pulled the fuel filters first. Why does this fuel look like mud??????? Fuel in the tank looks dirty. We have been pumping fuel from our main supply storage and it looks fine in everything else. Drin plug on the bottom of the truck fuel tank had seen too much road salt. It IS NOT coming out. Okay remove the fuel tank. A lemon sized hole s rusted out under one band and a pinhole started under the other band. Flush the tank, repair the holes. Flush the tank one more time. Replace the tank, clean the fuel system including bleeding the return side until fresh fuel is seen. Truck still won't start. If you turn it over log enough it will get a slug of fuel and struggle to run for a few seconds and quit. Don't have the proper equipment to test the fuel pressure at the injector return line, so I don't know if the pump has gone bad or if the dirty fuel has messed up the injectors. Any other ideas guys?

7.3 diesel in a 4700 Loadstar.
 
I am assuming that this is not a power stroke. If you look between the nozzles there are little hoses connecting them together. Check the hoses for cracks and the little mushroom caps . Under the the caps are o rings. They can cause a air leak
 
I assume this is not an electronic controlled engine ? If it is all mechanical,I would pressurize the fuel tank by holding a blow gun in the filler neck,and sealing it with a shop rag-in other words:very light pressure.And have someone crank the engine at the same time,probably with their foot on the floor.This may force air out of the system.Can you crack the injector lines and see if you getting fuel while cranking?Mark
 
Did the pressurized tank thing.. Injectors are oil operated in the 7.3. There s no separate line to each injector.
 
If the injectors are oil operated,then it is a HEUI engine.And it would have an ECM mounted above the left valve cover.If you don't have any fault codes,you may have a bad cam position sensor(CMP). They don't always make a fault code,and if you don't have access to a diagnostic reader to check the signal,I would change it.They are easy to replace.
Or,if you do have codes-it may be HEUI related-bad IPR,leaking o-ring on an injector,bad HEUI pump.Mark
 

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