G1800 bogging down while mowing

[Bob01]

Ok guys I have completely overhauled the entire fuel system, new lines new filters front and rear and fuel pump, drained the tank and cleaned it out, cleaned the injector pump and injectors and cleaned the fuel overflow line, checked all the safety switches and replaced, installed new air filter and installed new Interstate battery. Still have the bogging and dying problem. It's not the fuel because I use the same fuel in my other two tractors with no problems.

 

[jinman]

Wow! Have you tried running with your fuel tank cap loose enough that it will vent for sure? It would seem that you've chased through the entire fuel system and now you have to start thinking about valves and compression leakage maybe. A valve sticking could cause this or a chunk of carbon holding a valve open, but I'm grasping at staws here. You've got to be really frustrated. Mine also does it from time-to-time, but only for a few seconds and normally maybe once every 5th or 6th use of the mower.

 

[Bob01]

I get the same bogging down when I raise up off the seat when the pto is engaged, but I have replaced the seat switch. How do you wire around the seat switch??

 

[Gary Fowler]

Check the seat switch, is it normally opened or closed when pressure is on the seat. ON my old Troybuilt gasser, I just had to pull the plug. How it worked was when you took the pressure off it closed the circuit and killed the ignition by grounding it out so by unplugging the wire, it couldnt ground out. No clue to your bogging down issue. Seems like you have done everything that can be done to the fuel system, now you may want to look at the electrical for gremlins if there is any sort of electrical kill switch involved.

 

[Bob01]

I have been told by three local G1800 owners that they have experienced the same problem and now get this, all three have told me that it was a faulty fuel cap?? I don't have anything to lose so I ordered me one today. I will let you know when the cap arrives if it stops the problem.

 

[Bob01]

New fuel cap arrived Wednesday Put it on and presto, mowed leaves for three hours no bogging down,go figure...how could this be so simple? :laughing:

 

[peculiarmike]

New fuel cap arrived Wednesday Put it on and presto, mowed leaves for three hours no bogging down,go figure...how could this be so simple? :laughing:

Have the same problem with my used G1800 I bought a while back (I really like it).
Just applied a new $12.58 cap and about 20 minutes mowing later had the same problem, so the cap is not the problem on mine. It happens on level ground, on an incline, wherever.
I've serviced, maintained, repaired, rebuilt Diesels 36 years. BIG ones, in locomotives. A Diesel is a Diesel. This is a fuel problem and my next stop will be the fuel tank to see what is in there besides fuel.

 

[jinman]

You have two filters and a lift pump to consider. There is a filter before the lift pump that's located behind the left tire near the lift pump. As a minimum, I'd change both filters. I also think there may be a bad connection to the lift pump or it may not be running. When the tractor stalls, turn the ignition switch off/on and listen carefully to hear the lift pump operating or place your hand on it to make sure it's running before attempting to start the engine.

EDIT: I went back and found all the things you've done and refreshed my memory. I think there's a good chance that the ignition switch is only powering your lift pump intermittently.

 

[peculiarmike]

Not saying this is the problem. But it could be if you are not careful.
Diesel fuel will grow bacteria and fungi. It takes a bit of water, generally condensation and no more than a drop, to get it started and it goes from there. There are 27 types of bacteria that can grow in Diesel fuel. They can cause damage to steel parts and clog filters. Do a little research.
There is a range of additives out there that will keep Diesel bug from your tank. You should be using one.