Unhook the line leading to it and put the air compressor to it. I put some kind of soap in mine once cause I was desperate and after that they all worked much better too.
2001 7.3 F-250 LB 6sp. Dump bed, Firestone air bags, DP tuner, 4" MBRP, K&N intake with 6637, in tank mods
2002 7.3 EX limited 4x4, ccv mod, edge evo, 6637, RAS, In tank mods, diesel site tranny filter, JW valve body
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