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MEP-803 fuel pump does not run

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cstumpf750

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I just got one of these units From Govplanet. It ran in the videos in the listing. This is my first time with one of these. After I put batteries in it, it cranked and started right up, but died about 30 seconds later. I checked all the basic stuff and quickly figured out the fuel pump was Not running. I disconnected the power and put a meter on it, it got 24 volts when I turned the switch to prime. There are other wires besides the power going to the pump. Is there something else to check regarding them or is the pump dead and needs to be replaced? I have downloaded all the tech manuals, but so far can’t find much to help me.
 
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cstumpf750

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No, i have no faults and all the fault lights work if I press the test button.

I’ve been looking at the wire diagrams and it appears that as long as there is 24 volts to the pump it should run. Is that correct?
 
Light in the Dark

Light in the Dark

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Have you changed out the fuel filters, and cleaned out a particle filter (on the inlet side of the pump)? You might have trash starving the system... same goes for the tank.

I do the above, then rig up a clear plastic hose on the outlet side of the fuel pump (disconnect the line thats there) and run the hose into an empty 5 gallon can, see if it is pumping, or not, or if it pumps then slows).
 
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cstumpf750

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The pump makes no noise when power is sent to it. It flows no fuel with power to it and the output line disconnected. So I’m reasonably certain my pump is dead. It’s too cold out to work on it now. and try blowing the lines out or jumping the pump directly to the batteries. And so far my search for a replacement pump has been a bust. Seems the one in my unit, has been discontinued.

IMG_5674.jpeg
 
Light in the Dark

Light in the Dark

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There are a few different Airtex units that can work for this position, with a little modification. I would search the forums for the numbers (E8135 I think was one from memory).

The E1074 is NLA new. I might have one or two on the shelf, but the Airtex units should work well enough (Airtex made the E1074 unit). You will just need to clip the wires off the dead pump, and crimp/solder the pigtail with the plug onto it.

Don't forget, in a pinch you always have a backup pump that will work in the primary location (With some small fitting modification) in the AUX FUEL side of the machine.
 
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2Pbfeet

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I think that moving a long idle generator (or compressor for that matter) is a great way to loosen up all sorts of crud. Have you looked in the tank, or drained it to check for "foreign material"?

Before giving up on the pump, I would think about pulling it out and cleaning both the pump and the prefilter, and then check to ensure there isn't some random piece of debris plugging the inlet. Lots of us have fished out all sorts of material, including chunks of the well nuts, just perfect for restricting flow. Then I would clean the lines and change the main fuel filters, and see if you can get fuel through the final filter.

All the best,

2Pbfeet
 
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Dog Breath

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How much fuel is in the tank? It has 2 hours on the clock which is an indication that it really hasn’t ran from the start being a 1994. Or ran and put in the corner at the reserve station. Take off the tank and clean, go through the fuel pump and all lines. This is a tank I just cut the bottom out on a ‘82 003a. And it has been sealed within the last 15 yrs. Full of black tar
 

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cstumpf750

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It was reset. The oil is full and clean. There is about a third of a tank of fuel. I shown a flashlight in it and could see to the bottom, no junk. So none of that is a concern. The pump does not run or hum when power is applied. That is the issue. I think I found a source for a suitable pump that is $20 locally. I’ll report the final solution here.
 
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cstumpf750

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So I got a pump locally. It’s not ideal, I have to figure out a way to mount it. I got it from Napa, had them search for a 24 volt diesel pump.

It started right up. But now I think I have an alternator problem. The ammeter. Does not go positive when it is running, I’ll trouble shoot that later.
 

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Toolslinger

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If your batteries are in good shape, the ammeter should only go positive briefly. Once the batts are topped off from the start, it should show 0.
Compare the battery voltage running, and not. If it's higher when running, the alternator is putting out juice. I'm sure the other folks here can give you a harder number to determine alternator health.
 
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cstumpf750

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Forgot to mention, the pump I thought was available is discontinued. Ended up getting one at NAPA. Had them look up a 24 volt diesel electric fuel pump. Cost about $90 plus another $20 for fittings. Could have got a different unit for $70 if I was willing to wait a few days. Now I need to make a bracket to hold it as it is much longer with the fittings than the original pump.
 
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