Ok guys, I'm scratching my head on this one. Any advise/direction would be helpful.
Background:
On our recent trip to Florida in our '00 Beaver Patriot Thunder, we had the generator running as we drove down the road in order to use the roof airconditioners (our dash A/C wasn't working at that time). Somewhere around Alabama, we were passed by a pickup driver pulling a boat at 75 mph. The problem was all the other traffic was flowing at 65 mph. The driver, realizing (too late) their excessive closure speed to the cars in front of them, hit the brakes. HARD. The boat on their trailer decided it was no longer satisfied with just being "along for the ride", and decided it was time to drive. Swerving, skid marks, and tire smoke and dirt clouds ensued. The driver managed to careen off into the median and get the rig to a stop. In order to avoid all this chaos, I immediately hit the jake brake and stepped hardish on my own brakes bringing the rig to a respectable and controlled stop at a safe, but too close for my comfort, distance from the vehicles in front of me.
Problem:
Sometime after this at one of our rest stops, we noticed the 7500QD generator surging. A rhythmic Vroom, vroom, vroom could be heard from the generator side of the coach. I shut it down and restarted it several times. I checked for fault codes but got none. I did a lot of research over the next week trying to figure out what needed fixing. I suspected that some trash in the fuel tank found its way into the generator fuel line.
Attempted repairs:
I disconnected the fuel line from the generator and ran a new clean one from the generator into a clean fuel can with fresh diesel and Seafoam in it hoping to clean injectors?) or the carb (didn't see one). NOPE, NOT IT. I changed the fuel filter. NOPE, NOT IT. Then I changed the Fuel pump. Whew! That's a real pain! (my genset isn't on a slide). NOPE, NOT IT EITHER. Any ideas? The surging is very prevalent and I'm pretty sure I'm not producing any clean power because of it. Could it be trash in the line prior to the fuel pump? It seemed to flow pretty darn easy up my arm and onto the ground when I disconnected the line! I see fuel trickle out at a "drinking straw" rate from the return line when the genset was running.
The oil/filter/air filter were changed about a year ago.