New to me MEP-802 low fuel light on

[Ranger Danger]

I just got my 802 installed in the shipping container. When I start it, it will run between 5 and 15 min. then it shuts down and the low fuel light comes on. Its full of fuel. Any ideas why this would be happening?
I will be posting pics of this setup after I work out all the bugs.

 

[jamawieb]

Your float in the fuel tank is more than likely malfunctioning. You will have to take the back cover off where you refill the tank, to gain access to the fuel tank. The float is to the left and closest to you. Its held in with 4 screws, then disconnect the electrical connection with the quick connection and pull it out. Then do a continuity test with each float as you move them up and down. Pin 1 and 2 on the quick connection is for the aux fuel pump and pin 3&4 are for the low fuel light. The bottom float is for the low fuel fault indicator.

 

[Ranger Danger]

Thank you sir! Is it repairable or should I just replace it. Are they available?

 

[Ranger Danger]

Is this the critter we are talking about? If so, they are about $70 from GMG.

 

[Farmitall]

Is this the critter we are talking about? If so, they are about $70 from GMG.
View attachment 725354

Thats the critter.

 

[Ranger Danger]

Ok so lets go one step farther. I want to run my genny on an external fuel tank. Can I disconnect this plug and then bypass the internal fuel tank all together and plum the fuel pump direct from the external tank?

 

[Farmitall]

Ok so lets go one step farther. I want to run my genny on an external fuel tank. Can I disconnect this plug and then bypass the internal fuel tank all together and plum the fuel pump direct from the external tank?

I see no reason that wouldn't work. You'll just be operating with a larger fuel supply and no low fuel protection.....which to me is not a critical issue as I monitor my fuel tank/supply routinely and these sets prime up rather easily.

Keep in mind that you will have to eliminate the fuel pick up from the day tank and plumb your external source to that line directly.

 

[Ranger Danger]

Seems like I'm trying to reinvent the wheel over a $75 part

 

[Farmitall]

Seems like I'm trying to reinvent the wheel over a $75 part

Well, it's good to know alternative operating situations. What happens when that part is not available?......and not going to be available?

Reducing the operation down to something more basic is good info to know in a pinch. The more components in any system, the more things that can go wrong. Its good to know what part/s can be safely eliminated and still maintain operability.
That fuel float module is one such part.

 

[jamawieb]

Search the part number from the GMG post and you should be able to find it for $38. It only takes about 30 minutes to replace. The hardest part is taking the 20 little bolts off the cover to take it off. LOL!
Also usually no way to fix it, just buy a new one.

 

[jamawieb]

Search 6680-01-450-6330

​

 

[Ranger Danger]

Thanks, I found them.

 

[Daybreak]

Howdy,

Don't go buying one just yet.

Sometimes the floats get stuck. Open the fuel cap, remove the screen tube, reach in and manipulate the floats up and down. It could just be sticky, and needs some movement.

 

[Ranger Danger]

Thank you sir, Ill have my wife give that a try. My forearms are way to big to get in that tine place!!

 

[Chainbreaker]

Yep, having large forearms can certainly be a hindrance at times.

 

[Guyfang]

Have you taken out the float switch yet? You haven't said so, and the conversation went straight to buying a float. Sometimes it's simply a matter or cleaning crud off the float. Might also be a good time to look see into the tank. I have had several that shutdown for junk in the tank.

Didnt see Mikes post until I sent mine.

 

[Light in the Dark]

Your fault will lie with either fuel float or the float switch module. You can manually test the float as already described. There is a way to short out pins on the module to test, if you don't have other good parts to rest with.

 

[Light in the Dark]

And have you verified continued run condition by flipping the battle short before this happens, to see if the set will continue to run with the fuel light illuminated?

 

[impi]

Ok so lets go one step farther. I want to run my genny on an external fuel tank. Can I disconnect this plug and then bypass the internal fuel tank all together and plum the fuel pump direct from the external tank?

There are two floats on this piece. The upper float activates the fuel pump that draws fuel from the auxiliary fuel source and fill up the day tank. The lower float is what triggers the low fuel light.

I opened the panel and pulled the float switch out and cleaned it out before re-installing it. I had a dicey fuel level sender that needed replacement so I was busy in there anyway.