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Old 02-22-2019, 10:24 AM   #1
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Help vp44 fuse

Hi I have a 1999 coachmen Catalina motorhome with the cummins 5.9 liter 24 valve diesel. I do not have the 12 volts going to the electronic module on the vp44 injector pump. I need to know where the fuse is located for the injector pump. I have found four different fuse boxes. 2 in the engine compartment. One under the driver side dash and the forth one under the front hood. None of the fuses are blown on these 4 boxes and none of these fuses are marked injector pump. I can connect a hot wire to the injector pump relay and the engine cranks and runs fine. Thanks in advance for the help.
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Old 02-23-2019, 10:53 AM   #2
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Quote:
Originally Posted by knox View Post
Hi I have a 1999 coachmen Catalina motorhome with the cummins 5.9 liter 24 valve diesel. I do not have the 12 volts going to the electronic module on the vp44 injector pump. I need to know where the fuse is located for the injector pump. I have found four different fuse boxes. 2 in the engine compartment. One under the driver side dash and the forth one under the front hood. None of the fuses are blown on these 4 boxes and none of these fuses are marked injector pump. I can connect a hot wire to the injector pump relay and the engine cranks and runs fine. Thanks in advance for the help.
More than likely there is a relay or solenoid controlling power to the fuel pump solenoid.
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Old 02-23-2019, 08:13 PM   #3
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Hi thanks for the reply however I am having trouble with the power to the injector pump. both fuel pumps are working fine.
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Old 02-23-2019, 08:33 PM   #4
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On most of the fire and rescue trucks I have worked on, the pump injector pump solenoid on the engine is powered through a relay. You turn on the ignition switch or key and a relay supplied power to the injector pump. Turn key or switch off and relay opens and injector pump shuts down fuel and engine shuts down. You might also have a screw that can override the electrical side of things and get it running.
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Old 02-25-2019, 07:11 PM   #5
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Thanks for the help guys I have the motorhome running fine by connecting a new hot wire to the relay for the injector pump. The wiring diagram I found on cummins website shows a 20 amp fuse for the injector pump but it does not show the location of the fuse. I need to know where the fuse is located on the motorhome. I have found fuses in four different places which none are blown and none are marked injector pump. I feel that there is a fuse somewhere that I have not found yet. coachmen was no help at all they said that they did not have anything on a 1999 model.
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