Probably you can't fix it, too much water pressure. Ehiems are built a bit better so that might help but I don't think I'd bet on it with anything bigger than 10g or so. I assume you are using this on the cube in your sig.
The whole idea makes me nervous, I had an aquarium maintenance company sub me to sort out a similar problem once. They had a ~100g (like 4 feet tall) tank that had the same kind of setup with the bulkheads in the bottom and rigid PVC that connected up a pump and an Ocean Clear canister. Whoever installed it the first time used schedule 20 PVC so after a few years it got nice and brittle and then somebody pulled on it too hard. The whole tank drained, no way to stop it. It was in a restaurant too, they had to close for 2 days.
What you need to do is put a standpipe in your bulkheads. Even with an Ehiem you are risking a big mess here, an o-ring failure, a hose letting go, the canister cracking or you making a mistake will all result in the whole tank ending up on the floor.
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