Monitor 422 Fuel Problem

[dtjacob]

I have a Monitor 422 which I use to heat my garage. I am using the capsule fuel tanks. Heater ran fine yesterday, when I started it today, the fuel pump made a thumping noise for about 5 sec. & then the burner light came on. Ran fine for about 10 min., then the fuel pump thumped again for about 5 sec. & the burner shut down with the burner lights flashing. Pulled the fuel tank & cleaned the filter underneath it. Re-started & it did the same thing. The empty light did not come on. Did not pull the fuel filter on the lower right side. Any ideas????

Thanks,
Don

[dtjacob]

Update

Decided to try something else - put in an empty fuel tank & ran the heater until the empty alarm came on (had to re-start 2 or 3 times). Filled the fuel tank & heater started & ran fine for 3 hrs. Maybe a piece of dirt in the pump????

[Bryand]

Decided to try something else - put in an empty fuel tank & ran the heater until the empty alarm came on (had to re-start 2 or 3 times). Filled the fuel tank & heater started & ran fine for 3 hrs. Maybe a piece of dirt in the pump????

Could have gotten a air lock in your tank as well. I usually listen for mine to fill up the reservoir when I put the tank in. If it doesn't I will take the tank out put it back in or sometimes just shake it and it will do fine.