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No power to fuel pump when cranking
- Thread starter Dm567
- Start date
- 16,703
- 23,937
- 113
- Location
- Burgkunstadt, Germany
We need a bit more info.
Model?
What Fuel Pump? The supply or Aux fuel pump?
Have you downloaded the TM? Can You read an electric schematic? Do you have a DMM, and know how to use it?
Model?
What Fuel Pump? The supply or Aux fuel pump?
Have you downloaded the TM? Can You read an electric schematic? Do you have a DMM, and know how to use it?
- 2,135
- 3,506
- 113
- Location
- Pepperell, Massachusetts
My guess it's an 831A. If so...
The leftmost relay K12 is the Fault relay. When you move S1 to Run the LED in K12 will be on. Once started it should be off (no faults).
K12 has nothing to do with the primary fuel pump. The pump should run when you have S1 in Run.
Download the TM from the TM download section of the forum. It has troubleshooting info as well as schematics at the back of it.
Does the pump run at all?
The leftmost relay K12 is the Fault relay. When you move S1 to Run the LED in K12 will be on. Once started it should be off (no faults).
K12 has nothing to do with the primary fuel pump. The pump should run when you have S1 in Run.
Download the TM from the TM download section of the forum. It has troubleshooting info as well as schematics at the back of it.
Does the pump run at all?
The pump definately runs. I jumped it with 24 volts and it was pumping diesel.
problem Is that there’s no current to the fuel pump when I move S1 to run. The engine turns over but no power to the fuel pump And no fuel.
note that the fuel tank is full but the fuel guage shows empty. Could this have something to do with it?
problem Is that there’s no current to the fuel pump when I move S1 to run. The engine turns over but no power to the fuel pump And no fuel.
note that the fuel tank is full but the fuel guage shows empty. Could this have something to do with it?
- 2,135
- 3,506
- 113
- Location
- Pepperell, Massachusetts
The fuel level gauge operation has nothing to do with the primary fuel pump running.
The -13&P schematic does show the batteries, starter motor and everything else.
The primary fuel pump is to the right of the engine. The Aux fuel pump is behind the engine.
I'd suggest putting S1 in the Run position and then using a meter measure the DC voltage at the connector to the Primary Fuel Pump with respect to chassis ground with the pump connected. If both readings are 0 volts then you're losing 24 volts somewhere from S1-4 to the positive lead to the fuel pump.
If both readings are around 24 volts then the ground connection to the fuel pump is open.
Be sure diode CR2 is in place and not blown.
Be sure CB1 isn't tripped.
Be sure the Emergency Off button is pulled out.
The -13&P schematic does show the batteries, starter motor and everything else.
The primary fuel pump is to the right of the engine. The Aux fuel pump is behind the engine.
I'd suggest putting S1 in the Run position and then using a meter measure the DC voltage at the connector to the Primary Fuel Pump with respect to chassis ground with the pump connected. If both readings are 0 volts then you're losing 24 volts somewhere from S1-4 to the positive lead to the fuel pump.
If both readings are around 24 volts then the ground connection to the fuel pump is open.
Be sure diode CR2 is in place and not blown.
Be sure CB1 isn't tripped.
Be sure the Emergency Off button is pulled out.
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