If he is just swapping tanks and not the guts, cant see that would cause a problem. I put a new tank in my riviera just as a comment. The salt and sand had caused a leak on the top so it only leaked when i filled the tank. I think it was around $125 ordered through an auto store. For some reason it got shipped all over the country to the east coast then finally to Minnesota. It was like lost luggage. I think the tank had more miles on it than the car. The good ole days.
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His 1998 LeSabre has a tank with a mounting hole for the fuel tank pressure sensor
The 1991 LeSabre tank does NOT have this mounting hole for the fuel tank pressure sensor
So he’ll eventually get that fault code and MIL related to the fuel tank pressure sensor
bottom line . . . he’s planning on installing the incorrect fuel tank
91 is OBD I, 98 is OBD II. OBD II requires the evap system be pressure tested periodically by the car itself, so requires an in tank pressure sensor. The OBD I evap system is pressure tested also, but done by an emissions-shop test, so doesn’t require in tank pressure sensor. OBD I is the preferred approach imo, given the number of OBD II evap system problems reported here.
Wouldn’t be beyond minimal skills to simply plug the hole. A bolt and a couple washers with gaskets should do it. This is not the space shuttle.
That would work for putting a 98 tank into a 91 Buick, but when placing a 91 tank in a 98 Buick, there’s no hole for the fuel tank pressure sensor. If the sensor isn’t in the fuel tank it won’t read correctly, and that will turn on the CEL. Possibly a hole could be made in a 91 tank that fits the sensor needed for the 98 Buick… But then there’s the problem of the vent and purge valves.
Wisconsin. Never any kind of inspections.
Then I guess you’ll be fine with that 1991 tank installed, as long as it’s sealing properly
just out of curiosity . . . is the 1991 Buick just a donor car at this point?
Yes the 91 is in awful shape and some other issues. The motor runs great. The tranny has issues with possibly a bad sensor as it would not always want to shift at times. I would have to manually shift it. It has some other issues and with the shape the body was in it got parked. The hood is in good shape. It has the backwards hood which is kinda cool.
I got the tank on yesterday. It started nicely and ran very good. I haven’t taken it for a long trip yet. But it looks like case closed. Thank you.
Maybe my biggest concern for the future is how badly she is rusted underneath. It has a hitch and it’s unlikely I’d ever pull anything, at least not on the road, afraid the hitch could pull right off the back of the frame. Also with all those wires that run along the rocker panels with it being so rusty there. The body otherwise is in good shape.
Drove it to work and back. 50 miles. Ran great.
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That’s great news! 