MEP804A start/run problems

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Frapman54

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Scappoose Oregon
2007 MEP804A will start but will not run. Red trouble light--no fuel. The tank is full, I do not hear any priming when the switch is placed in the prime run position. Any help or ideas. I have had this genny for several years and have tried numerous things!
 

Guyfang

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Burgkunstadt, Germany
2007 MEP804A will start but will not run. Red trouble light--no fuel. The tank is full, I do not hear any priming when the switch is placed in the prime run position. (What prime position? Aux prime? Because there is no prime function. You will never hear pumps run, when its in the run position.) Any help or ideas. I have had this genny for several years and have tried numerous things!
Try this.
1. Start normally. Hold the S1 in the up position, and don't let go. Then push up the S17 switch, and when its light comes on, let go of the S1. Will the set run? Or stop? The idiot light should come on. For no fuel. It probably means your fuel level switch, FL-1 and FL-2 is not working. Could be its stuck. Could be it broken. Try this, and if it runs after letting S1 go, pull out the Fuel level sender and test it IAW the TM.
 

Frapman54

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I held the S1 switch in the run position, pushed in S17(the kill button). As soon as I pushed in S17 the genny died. Yes the idiot light came on also. I don't understand the test.
 

Frapman54

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Scappoose Oregon
Shortly after bringing the genny home I put new batteris in her. The genny would start and run but ran rough. I did some research for this problem and one of symptons pointed to the pump timing. The pump is brand new so I thind prior owner installed it incorrectly. The pump was not timed correctly. I removed it and following the TM I installed it correctly. I bled the air out of the system and started it. It ran okay for a while then died. I found the 3amp slow blow fuse went South. I ordered a new and installed it. The genny fired right up and ran great. I let it run for a good 30 mikes, observing the oil pressure, H2O temp and charging. All was perfect! I then changed the oil and filter, fill the tank to the nuts and put it away till I needed it.
A couple of weeks ago I fired the genny up. It would start and run as long as I held the S1 switch in the start position but as soon as I let go of S1 the genny would die. The idiot light for low fuel would come on also. I was told that probably the FL1 and or the FL2 were stuck so that is what I am looking at now. These floats are hard to get to so what I want to do is try and jumper past them first before I tear into it.
Does this sound feasible?
 

Guyfang

Well-known member
7,322
1,072
113
Location
Burgkunstadt, Germany
Shortly after bringing the genny home I put new batteris in her. The genny would start and run but ran rough. I did some research for this problem and one of symptons pointed to the pump timing. The pump is brand new so I thind prior owner installed it incorrectly. The pump was not timed correctly. I removed it and following the TM I installed it correctly. I bled the air out of the system and started it. It ran okay for a while then died. I found the 3amp slow blow fuse went South. I ordered a new and installed it. The genny fired right up and ran great. I let it run for a good 30 mikes, observing the oil pressure, H2O temp and charging. All was perfect! I then changed the oil and filter, fill the tank to the nuts and put it away till I needed it.
A couple of weeks ago I fired the genny up. It would start and run as long as I held the S1 switch in the start position but as soon as I let go of S1 the genny would die. The idiot light for low fuel would come on also. I was told that probably the FL1 and or the FL2 were stuck so that is what I am looking at now. These floats are hard to get to so what I want to do is try and jumper past them first before I tear into it.
Does this sound feasible?
Of course you can cheat the float. You can also just pull the C- plug out of the fault indicator. Then the fault will not shut the gen set down. But also, NO fault will be seen by the fault indicator. I would look at the float first.
 

Frapman54

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Okay that sounds better, I'll let you know what I find. I pushed S7 up and let S1 go to run position. The genny kept running like it should, so that indicates what? bad floats
 

Frapman54

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Scappoose Oregon
I pulled the fuel sending unit, it works as per TM. The fuel level gauge does not work now. I pulled the plug to FAULT board, the genny runs great! What would be your best guess?, is the board bad?
 

Guyfang

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Location
Burgkunstadt, Germany
First I would reattach the plug to the sending unit, with the sending unit in your hand. Hold the float up, have someone else start the set. What happens? If the fault is still there, measure at J12, pin three for voltage, during startup. FL1 is the Low Fuel Level switch. If you do not have voltage, you need to check out the A9 module.
 
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