There seemed to be no thread on the Previa forum dedicated to these parts so I thought I'd start one.
My '91 has never had any fuel system maintenance so I was thinking of doing something about that. It has no symptoms of fuel supply problems, but everything is 27+ yrs old now.
The system appears to have a filter attached to the fuel pump inside the tank (the first point at which fuel is filtered) and an in-line fuel filter canister just downstream of the tank (the second [last?] point of fuel filtration). In the parts diagram in my service manual the filter inside the tank looks like a bag of some sort attached to the inlet of the pump.
It would seem like both filters would need to be serviced if you're going to do it properly? How do you know the filter in the tank is good or bad without inspecting it? If the system has a problem and only the in-line canister is replaced you might be improving the situation but not solving the root cause?
Is the canister filter the sort of thing you can replace with a clear after-market type (if such exists) so it can be monitored for cleanliness?
Does anyone have any experience with any of this? Comments?