03-23-2026, 10:50 AM
Guy ,
I had trouble with the '86 after changing filters a few years ago . At the same time I also replaced the original fuel water separators ( looks like yours) with more modern
Racor type units . I plumbed an electric pump into the secondary filter housing feeding from a bucket of fuel . The engine started right up and would run as long as the pump
was running , but would not continue running after electric pump was turned off .
I ended up plumbing a gear pump into the system , just before the Primary filter housing . Ran the pump with a drill until the engine smoothed out .
Removed gear pump and restarted engine as soon as I could . No problems since .
Evidently I had gotten air in the system and the Detroit fuel pump didn't have enough suction to draw fuel through 40 ft of hoses , etc. The pump is actually a transfer pump ,
the high fuel pressure is developed by the injectors themselves .
BTW : I also tried pressurizing the fuel tanks to no avail .
Chris
I had trouble with the '86 after changing filters a few years ago . At the same time I also replaced the original fuel water separators ( looks like yours) with more modern
Racor type units . I plumbed an electric pump into the secondary filter housing feeding from a bucket of fuel . The engine started right up and would run as long as the pump
was running , but would not continue running after electric pump was turned off .
I ended up plumbing a gear pump into the system , just before the Primary filter housing . Ran the pump with a drill until the engine smoothed out .
Removed gear pump and restarted engine as soon as I could . No problems since .
Evidently I had gotten air in the system and the Detroit fuel pump didn't have enough suction to draw fuel through 40 ft of hoses , etc. The pump is actually a transfer pump ,
the high fuel pressure is developed by the injectors themselves .
BTW : I also tried pressurizing the fuel tanks to no avail .
Chris
1986 #89
VIN 007
Detroit 8V92 TA 475 HP
Allison four speed
Chris and Sharon Hand