MEP-803A no AC output

[Hard Head]

Has he removed the front cover and looked at the tank / fuel pump? If the unit is working until prime is lost then there has to be a leak. Does the aux fuel system work?

 

[DieselAddict]

Has he removed the front cover and looked at the tank / fuel pump? If the unit is working until prime is lost then there has to be a leak. Does the aux fuel system work?

That's my thought is there is a leak somewhere allowing the system to drain back into the tank.

Just for grins maybe remove and check the seals on the filters.

 

[Guyfang]

Like you all, I think it has to be a leak. But could also be the flapper in the e-fuel pump, that acts as a "check valve". It happens, but not often.

 

[Daybreak]

That's my thought is there is a leak somewhere allowing the system to drain back into the tank.
Just for grins maybe remove and check the seals on the filters.

Howdy,
Exactly.

Take a look at your canister filter. Make sure that little tiny gasket stayed in place on top of the cup when you re-installed it.

We are all saying this...and that.

I hope all filters were changed. Fuel cartridge filter and the fuel/water separator filter.

NOTE: after running, system itself is self bleeding. That is the sound change for the fuel pumps from a hollow sound to a full sound. All fuel pumps thru the system and back to the tank via fuel return lines.

 

[Ray70]

Anything upstream of the primary pump shouldn't matter as far as drain back, and it doesn't sound like you are sucking air while running ( otherwise it wouldn't run smooth under load ) Just check from the primary electric pump to the 4 metering pumps and see if there are any issues or leaks. If everything is good and the filter and fuel / water separator are good, I'd suggest changing the fuel pump. If you still have the crappy square body pump, definitely get rid of it. An Airtex E8135 is a drop in replacement for the square pump. $35 on-line. If you have one of the round pumps with the 4" stainless extension line installed you will need some NPT x Flare adapters to make the E8135 fit.
Even with an air leak or a bad check valve in the pump, like Daybreak said, a good pump will self-bleed fairly quickly. My money says you have a failing fuel pump....
And like I said, if it's the old square body pump, get rid of it now... they are known as unreliable pieces of junk.

 

[Daybreak]

Howdy,

The exact fuel pump

[FONT=Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif]MEP-802/803 fuel pump[/FONT]

 

[k9medic]

Thanks all.

I borrowed a double oven today and put both ovens to bake at 400 degrees. After 2 hours and no hiccups, I turned everything off.

The generator ran great. I swapped out the analog hertz meter with a digital one and it held 240-242v at 60 hz the entire time.

The load meter still does not work though.

Here is a photo of the injectors though after I shut it down. Not sure what that might be -

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[smokem joe]

Those rubber lines coming from the fuel supply down to the injector are known to go bad. Are you sure they aren't leaking?

 

[Guyfang]

Looks oil to me.

 

[k9medic]

I agree it looks like oil seepage from somewhere. The engine was clean and dry when I started it.

I did swap out the worthless hertz gauge though. Now also thinking about getting a digital amp/load meter.

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[Guyfang]

I would say push rod tubes would be a good place to start looking.

 

[smokem joe]

Could be oil coming out around the base of the pump

 

[smokem joe]

Guy might have nailed it. Looks like more than one is leaking