When I installed the GAP-4 module into my Tanks Inc tank, I did have to trim the outlet (black) hose to get it to fit properly. In fact the instructions specifically stated that you would need to measure first, then trim to length.
If due to the length of pump output nipple and barbed fitting, you no longer have room to trim the output hose, you may consider gluing a couple cork gaskets together. The pickup sock should sit very lightly on the bottom of the sump without being crushed in any way.
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-Jason
1969 Pontiac Firebird
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