Will someone explain the way the filter(s) work on a '92 Suzuki? I am refering to the fact that there are two filters back by the tank. One is between the tank and pump - I assume this filters the pick-up from the tank. One is on a return line to the tank - is this a filter? There is also a small black canister mounted low on the outside of the cab, on the drivers side. What is this? I purchased a Wix 33470 based on a suggestion on this forum. It is close in size to the filter between the tank and pump, but does not fit exactly. Are there any other suggestions or recommendations? Any other sources for filters? Thanks!