iamdub
Full Access Member
It's crazy that we shut the key off right as it ran out of gas before changing the oil.
The timing is nearly impeccable, but it's not so far-fetched. The pump pulls fuel from the tank and fills a bucket that the pump itself is inside of, and it feeds the engine with the fuel in that bucket. So, if the fuel level in the tank is right at the minimum for the pump to suck it up through the bottom of the bucket (through one-way disc valve), it could fill the bucket and run on that for a short time while the tank is essentially empty. If you shut it off during this time period, and if the disc valve isn't 100% sealed, the fuel would drain out of the bucket and back into the tank. But, the tank level won't be high enough to reach the bottom of the bucket the next time you turn the key and the system attempts to prime. You must've shut it off during that time when it was running on the fuel in the bucket, which is probably about a quart, maybe a little more.