Not on a hot day but I can see how it might run back into the other tank on a steep climb.
The filler isnt that much higher than the main tank, diesel could easily run back up the filer hose into the junction below the cap and end up in the aux tank. Solution - Just pump back into the main when on level ground.
Regards,
Tote
				
			 
			
		 
			
				
			
			
				Go home, your igloo is on fire....
2014 Chile Red  L494 RRS Autobiography Supercharged
MY2016 Aintree Green Defender 130 Cab Chassis
1957 Series 1 107 ute - In pieces
1974 F250 Highboy - Very rusty project 
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