Leaderboard

Would not be the first faulty component I have come across and then spent futile hours chaseing other posible causes. If it is the only thing on that fuse it is faulty. OR the wire downstream of the fuse has an intermittant short that is masked at 25A by thin wire upstream not passing the current. Try running a test wire from the battery fitted with a 5 A fuse direct from the battery to the pump. If the fuse does not blow then you have a wiring fault, if it does blow the pump is faulty.