Both my Isuzu Pup diesel and my Trooper TD have the same exact problem: If there is less than a 1/4 tank of fuel and I park for more than 4 hours on a hill (with the engine facing uphill), it won't start. I have to push the car to level ground and then suck fuel back up to the filter to get it to start. All the lines seem tight and I don't have any fuel leaks. Any comments?


Steve