Not a skid steer/kaiser air compressor issue

[V65ozzie]

My compressor will fire up fine, run for about 10 minutes and shut down. Replaced fuel filters suspecting a dirty element. Have noticed this: On starting, the small electric fuel pump primes, during start. but after the engine fires and switch returns to run position, the primer pump stops running. Is this normal? Or does the injector pump take over at this point, or should the electrical pump run continually? I'm looking for a place to start diagnostics. When it shuts off, it's sudden. Running fine, then immediate shut down. Thanks for any help you can give me.

 

[Tazza]

I believe the pump should keep running even after start up.
After startup, it may have enough fuel pressure to keep running, but after time it may not have enough pressure to keep feeding the the pump and it shuts down. Some engines will run without a pump, but when it loads down, it uses more fuel and it can't draw it un fast enough and it shuts down.
Either way, wire the fuel pump up to +12v and see if it shuts down like it used to.

 

[V65ozzie]

I believe the pump should keep running even after start up.
After startup, it may have enough fuel pressure to keep running, but after time it may not have enough pressure to keep feeding the the pump and it shuts down. Some engines will run without a pump, but when it loads down, it uses more fuel and it can't draw it un fast enough and it shuts down.
Either way, wire the fuel pump up to +12v and see if it shuts down like it used to.

Thanks. I think we have the issue solved. The radiator was filthy outside, looked like concrete dust, we sprayed it down with cleaner and gently pressure washed it off, now I can see through it from the correct angle. So far so good. We will see the next time it goes out. I suspect that it was hitting the danger zone and auto shutting off. Unfortunately I cannot be onsite when it happens, and by the time I get there, the machine has cooled enough to return to running. Running at the shop doesn't aid because it really needs to be run under a heavy load for it to shut down. A customer pointed me in the right direction, I hope.

 

[V65ozzie]

Thanks. I think we have the issue solved. The radiator was filthy outside, looked like concrete dust, we sprayed it down with cleaner and gently pressure washed it off, now I can see through it from the correct angle. So far so good. We will see the next time it goes out. I suspect that it was hitting the danger zone and auto shutting off. Unfortunately I cannot be onsite when it happens, and by the time I get there, the machine has cooled enough to return to running. Running at the shop doesn't aid because it really needs to be run under a heavy load for it to shut down. A customer pointed me in the right direction, I hope.

Update. After a year, the problem has not re-occurred, I've added rinsing out the radiator fins to routine maintenance.