THere is a pressure that develops due to elevation changes, but it's not all that much in total for your situation. It amounts to only 0.43# per foot of elevation drop. I seriously doubt it would have enough pressure to open a popup unless the pump was on, thus, assuming the pop up actually goes up, it isn't going to happen, as that vertical section at the end would negate most if not all of the effects of gravity on the water left in the line in the distance you have. Say you went out 40', at the recommended 1/4"/foot, that's a 10" drop, so a little over 0.3# of water pressure, and less if you then turned the pipe up to maybe nothing. A small weep hole at the point it went up might, but if it were really cold out, could easily freeze, especially if it were above ground.
You really need the line to drain with no water left when the pump turns off. Draining it into a dry well is probably your best bet. But, since that puts it back into the ground nearby the house, you might just end up pumping the same water over and over again!
The first thing that should be looked at is the grade around the house. FOr at least 6' or so, it should slope away from the house. THen, if there are any gutters, those should not dump their output right next to the foundation - you'd want that to go out a ways. There are some devices that unroll you can put at the drain spout to move that water out further away from the house if you can't do something fixed.
FWIW, the house were I grew up pumped the water up maybe 7' and then it turned horizontal and ran nearly 100'. It emptied into a drainage ditch, so the line drained whenever the pump turned off. Never had any problems except when the power went off! We lived maybe 1/4-mile from the town's spring fed water supply, so the water table was really high. The pump ran most of the year, even through the winter. It only stopped if we ended up in a drought.