Quiet Diesel 7500 Fuel leak

Moder2 · 02-19-2008, 02:58 PM

Just noticed under my coach what looked like leaking oil... Nope, it's diesel. Ugh.

Bottom of genny is wet, can't really tell where it is coming from, but the lines seem to be wet, though from my quick inspection it doesn't look like a bad line or even a loose clamp.

Has anyone else run into this? I really haven't done anything to the generator in the past few months other than regular monthly exercise. I did have it running a couple weeks ago when we had the tires changed, but nothing was done near it.

The worst part is I know something is wrong, but can't do much about it cause it is so blasted cold here! Ugh.

John

Moder2 · 02-19-2008, 02:58 PM

Just noticed under my coach what looked like leaking oil... Nope, it's diesel. Ugh.

Bottom of genny is wet, can't really tell where it is coming from, but the lines seem to be wet, though from my quick inspection it doesn't look like a bad line or even a loose clamp.

Has anyone else run into this? I really haven't done anything to the generator in the past few months other than regular monthly exercise. I did have it running a couple weeks ago when we had the tires changed, but nothing was done near it.

The worst part is I know something is wrong, but can't do much about it cause it is so blasted cold here! Ugh.

John

**RV Wizard** · 02-20-2008, 12:34 AM

John, you could drop the bottom access cover and check to see if a loose fitting on the fuel filter is the culprit.

Moder2 · 02-20-2008, 10:11 AM

Oh man, picked the wrong day to mess with this.

Pulled the access plate, everything inside soaked with diesel... Appeared to be the top fitting, of course the one that is too thick to get a flare wrench on, and was too tight already for a regualar open end wrench. Ugh.

I ended up repalceing the entire line from the Injector pump down. The line failed at the crimp for the fitting going into the fuel filter. I had to use a piece of steel line into some 5/16th inch rubber line, but it seem to be holding well, and not leaking yet.

The worst part was laying on my back with diesel dripping in my face and only 12 degree's outside. It really wasn't too bad once I took off the top cover, and saw where the line went. I don't understand why Cummins/Onan decided on that ridiculous filter arrangement. There's plenty of room, what would be wrong with a simple spin on filter? argh.