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Fuel pump i have new cummins engine model:6CTA (genset)but my engine work with low power.i forcast fuel pump have proplemBut i dont have manual for bosch pumpPlease help me solve that problem

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You may check first if all the fuel lines are completely filled with fuel (primed). Also check the fuel filters. Low power can also be caused by retarted ignition timing.

Posted on Jun 11, 2009

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Posted on Jan 02, 2017

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2) Exhaust temperature sensors. Older units were notorious for burning these up.

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1. High water temp
2. Low Oil
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From the manual these are the protection circuits.

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• Genset protection: under/over voltage, overload, battery charger failure, battery voltage out of limits,
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Any one of them will trip the fuel relay closed. What you may be able to do is disconnect one at a time each protection circuit and see when the fuel relay opens. (Make sure to reconnect each one if it had no effect on the fuel solenoid)

Once you isolate which circuit it is in then you can chase wires or change the bad switch.

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My truck runs great but sometimes it just shuts off and has a rough start up then runs fine doesn't over heat battery hair over 14 new plugs when bought oil pressure hair under 40 First dodge i have ever...


Try replacing your fuel shutoff solenoid. This is an electronic device in the injector pump that is responsible for cutting fuel when you turn the key off. Otherwise, the engine would never shut off. If this malfunctions it can cause issues like what you describe. It can also fail in the opposite position, making it impossible to shut the engine off short of cutting the fuel lines. You may consider calling a local diesel shop and ask them if that is something they have in stock and if you can replace it with simple tools. I have never touched a cummins, but I know they use Bosch pumps and Bosch pumps on VW use these solenoids.

Next thing to check... there are small steel fuel lines connecting each injector to each other. I think those seal with a copper washer gasket. Make sure those are tight and not leaking. If air is introduced into the system it can cause the engine to stall or run rough. Make sure all other fuel lines are in great shape and tighten down all the clamps. Good luck.

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