There's another problem with high suction lift
of gasoline. Combining a high suction lift
configuration with high ambient temperature can cause vapor lock.
At the risk of thread drift, I've had personal experience with this. I grew up hearing my grandparents talking about their vehicles stalling from vapor lock while driving in the High Sierras, but those were carbureted engines, and I didn't give it much thought by the time I started driving. But then on a road trip I experienced a mysterious sudden power loss and eventual engine
shut-down in a 90s era car with a fuel
. The altitude was only about 4500 feet, but it was close to 110 F. Anyway, at first I thought it was a fuel pump
failure. So I crawled under the car, hoping to hear the pump run when my GF switched on the ignition. But once I was close to the tank, I could hear a gurgling noise
, and when I got out from under and opened the filler cap, there was a an obvious sucking sound, followed by gas gushing out! Put the cap back on, engine started, drove away, but it happened again 30 miles later. Wound up having to finish the rest of the trip with no filler cap on, just to keep it running. Later diagnosed as a tank vent issue, part of the emission controls. The combination of the 100+ F weather
and the failed tank vent control literally had the gasoline boiling in the tank.