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carlyai

Trouble with 5 KVA Diesel Genset

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After an absence, when I tried to start the genset, it would not start.

 

The engine turned over OK, but wouldn't start.

 

I found that the fuel pump valve wasn't working, and on further inspection, looks like the mice have eaten through 6 wires going from the genset to the front control panel, one of the wires going from the start/stop key to the fuel pump valve.

 

I repaired the wires and bled air out of the pipe from the fuel tank to the fuel pump and the output of the fuel pump.

 

The genset now runs but low revs that finally ( after about 10 mins) increased to where I could read 180 V output, then this slowly increased to 200v output. At about 200V it really started to rev, then closed down.

 

Could this be due to air in the fuel line?

I'm hoping that could be the case as I didn't bleed the injector.

 

 

 

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I would say a good chance of air in the fuel system "somewhere" .

I would recheck the fuel pump delivery outlet for air- as for the injector - can you access the injector input it and check for air . Any signs of water in the fuel filter or blockages? 

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Hi thanks. Hope all is well with you.

I changed the fuel first thing when the engine wouldn't start initially.

Because I have to remove all the top off the genset, I didn't check for air at the other end of the high pressure pipe coming from the fuel pump.

I'll get back in there tomorrow morn and recheck all the fuel line this time.

Hopefully air is what it is and not anything to do with the governor or regulator. Just hope I didn't stuff anything cranking it over before with those wires eaten through.

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If the engine has ran for a period, then it is doubtful that it is air in the system, as the air should have worked its way out, it is easy enough to check by cracking open the union on the top of the injector for a very short period and then tighten it again.

It may be an issue with the AVR, if one is fitted?

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Run for a bit then stop, check the fuel filter and the crud gauze in the tank (if it has one) if you haven't already, bleed the injector again.

 

Check your connections again, make sure they are good the fuel solenoid can be a bit ampy.

 

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If the engine has ran for a period, then it is doubtful that it is air in the system, as the air should have worked its way out, it is easy enough to check by cracking open the union on the top of the injector for a very short period and then tighten it again.
It may be an issue with the AVR, if one is fitted?
Hi, yes, will check the injector tomorrow. It's a bit of a pain to get too. Hopefully not the AVR.

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Run for a bit then stop, check the fuel filter and the crud gauze in the tank (if it has one) if you haven't already, bleed the injector again.
 
Check your connections again, make sure they are good the fuel solenoid can be a bit ampy.
 
Hello Crossy, thanks for the reply.
Yes I did have the fuel solenoid out to test the spring operated valve. I'll go thru all the bleeding steps again tomorrow.

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4 minutes ago, carlyai said:

I'll go thru all the bleeding steps again tomorrow.

Cue major power failure tonight ?

 

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its not a fuel problem , its electrical problem ,most likley the AVR.

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6 minutes ago, sirmud63 said:

its not a fuel problem , its electrical problem ,most likley the AVR.

How so?

 

This is a simple, mechanically injected diesel, the only electrical control to the engine is the fuel solenoid.

 

Easily checked by monitoring the voltage on the fuel solenoid, if the controller is stopping the engine coz of no output it should be obvious (and it should start on the key until the controller decides to stop the beast again).

 

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its not a fuel problem , its electrical problem ,most likley the AVR.
Oh well if it is it is...I'll do all the bleeding first. Thanks.



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Just now, Crossy said:

How so?

 

This is a simple, mechanically injected diesel, the only electrical control to the engine is the fuel solenoid.

IF it is fitted with an AVR and I have no idea if it has, then this may well be interfaced to the control of the engine to regulate the voltage.

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2 minutes ago, Crossy said:

How so?

 

This is a simple, mechanically injected diesel, the only electrical control to the engine is the fuel solenoid.

 

Easily checked by monitoring the voltage on the fuel solenoid, if the controller is stopping the engine coz of no output it should be obvious.

 

he said the engine over reving till it shut its self down .thats not a fuel or air problem on a diesel engine .

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7 minutes ago, Mattd said:

IF it is fitted with an AVR and I have no idea if it has, then this may well be interfaced to the control of the engine to regulate the voltage.

Please explain, this is not an inverter unit. The engine speed (on a mechanical governor) determines the output frequency, the field strength is controlled by the AVR to fix the output voltage.

 

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5 minutes ago, sirmud63 said:

he said the engine over reving till it shut its self down .thats not a fuel or air problem on a diesel engine .

Did he?

 

I see he said it started to rev (this is a 3000 RPM genset) then shut down.

 

On a mechanically governed and injected diesel what else could it be? 

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