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1990 760 t no fuel

posted by  grindstone on  Thu Nov 20 12:31 CST 2014
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1990 760 not getting fuel , pump is working working








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1990 760 t no fuel

posted by  aleekat on  Thu Nov 20 15:48 CST 2014
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last visit: Fri Oct 24 13:19 CST 2014
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https://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#FuelPumpandFIRelayDiagnosticTests

Car can run with a dead intank pump, but not a dead main pump.
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1990 760 t no fuel

posted by  grindstone on  Tue Nov 25 22:20 CST 2014
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main fuel pump is toast








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1990 760 t no fuel

posted by  aleekat on  Tue Nov 25 22:41 CST 2014
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If you don't know the age of your fuel filter, change it while you do the main pump.
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1990 760 t no fuel

posted by  jerryc on  Thu Nov 20 12:54 CST 2014
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Which pump is working working? There are two in your system, one in the tank, one underneath. Is there no fuel to the rail, or fuel to the rail but not through the injectors? If the latter, then maybe the rsr/fuel injection relay.
If no or reduced fuel to the rail, maybe the filter.








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1990 760 t no fuel

posted by  grindstone on  Thu Nov 20 15:10 CST 2014
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not sure of procedure but i disconnected the fuel supply line to the rail ,turned on key ,pump ran but not much fuel came out and certainly not under pressure ,just a trickle , after cycling pump 4 times i got about half cup of fuel ,should the fuel come out under a lot of pressure/?







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