Originally Posted by Pau Hana
It's normal for the Wallas to go thru several startup cycles with a dry fuel system. If it's pulling fuel from the gallon jug (I assume the jug is set below the heater, yes?), then it'll pull fuel from the main tank. If the jug is above the heater, it may be gravity feeding the heater.
Did you run the heater for longer than 30 seconds or 30 minutes? Is the exhaust blocked in any way? What codes are you receiving on the remote control? The codes can pinpoint the problem area.
At this point, I'd replace all rubber hosing to eliminate it as an area of air leakage.
The gallon jug of diesel fuel was located below the Wallas fuel pump; at the same level as the port fuel tank.
The heater fired up on the first attempt after removing the fuel line from the tank pickup tube and placed in the jug. The heater ran for 30 minutes. The entire fuel line was dry before that startup. The Wallas fuel pump on my trawler pulls the fuel column about 1 inch with each pump cycle.
I have no evidence that the exhaust line is blocked.
The fault code when the heater shut down during startup 4 days ago was “Flame out” with the red burner icon and the yellow fan icon blinking before complete shutdown. The same fault code appeared during the 2 failed startup experiments after the successful startup experiment using the gallon fuel jug.
I, also, assumed that the heater would startup normally after determining that the metal fuel pickup tube was not blocked but that was not what happened.
I will replace the rubber fuel line hose tomorrow and repeat the experiment.
Thanks for the suggestions.