B7800 will not run after rain?

[Old Kubota]

Is this right? Seems kinda silly or missing some info. I don't have the book just found this online.

 

[Ed ke6bnl]

That is what my book says, not very clear on what is going on BUT fill tank with fuel is a big part of the procedure

 

[Old Kubota]

I can't even get it started. Battery is weak from trying but even with a jump starter it still just turns over.

Not sure what to do since it started and ran for a a min then died.

If it was anything else i would check for a spark.

 

[Carl_NH]

When you installed the new fuel filter, did you let the small canister fill with diesel before tightening the bowl? That eliminates any air in the system, and if you did not do that, yes, the engine will run until it pulls that air in, then you need to crank it to remove it.

You could still crack open the fuel filter and make sure there is no air now and there is good fuel flow, but you either need to crank it over to get the air out of the system. I would try the crank method before loosening the injector lines - that's a last resort.

 

[Old Kubota]

When you installed the new fuel filter, did you let the small canister fill with diesel before tightening the bowl? That eliminates any air in the system, and if you did not do that, yes, the engine will run until it pulls that air in, then you need to crank it to remove it.

You could still crack open the fuel filter and make sure there is no air now and there is good fuel flow, but you either need to crank it over to get the air out of the system. I would try the crank method before loosening the injector lines - that's a last resort.

Actually when i removed the small canister diesel fuel never stooped flowing the bowel was full by the time i got it back on.

 

[Carl_NH]

So you replaced the filter without shutting off the fuel, I guess? That eliminates air and its not leaking any now after replacing the filter?

 

[airbiscuit]

Here is a pretty good video about the fuel cutoff solenoid. He shows how to prime the engine at 20:50

 

[Old Kubota]

Okay i got it started didn't do anything to it, the 30 amp fuse was fine and i can hear the solenoid turn on. Looks like it had been replaced at some point as it was the cleanest part in there.

I bought this tractor off my neighbor last year for real cheap almost free with 600hrs on it and i told him what it was doing and he had the same issue after it rained and never could figure it out. Had it at the local dealer and they said nothing was wrong with it.

I did noticed that black smoke came out when it did start as normal and before nothing was coming out of the exhaust when it would just turn over and not start.

It's been outside it's whole life.

 

[Old Kubota]

Does anyone have a idea of why it does this? It has to be a good amount of rain, it rained 3 inches the other day.

 

[Carl_NH]

OK so it started now with a puff of black smoke, which is normal in the first few seconds after starting.

I suspect it was the plugged air filter, when its wet / damp the pores of the filter are so plugged it can't get air - though its rare, it is possible if you are in a damp, humid environment and have dust too - this will then grow algae inside further blocking the air.

Mendosy said "Another possibility is that the air filter got wet and isn't allowing enough air into the engine" I think it the best diagnosis I can see from my limited view!