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A diesel engine uses a high pressure fuel system,which means that it can't have air in it,it's kinda like the hydraulic brake system,if their is air in it,it won't work right.

when you run a diesel out of fuel,it sucks in a bunch of air,which must be bled out of the system,in order for it to re-prime its self. if you don't get the air out,then,the diesel fuel will only travel up so far into the fuel line,until it is stopped by air,that's why a diesel is so hard to start after you run them outta fuel.

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15y ago

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