91 LS400 Gas tank removal/replacement
02-29-20, 10:59 AM
#1
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91 LS400 Gas tank removal/replacement
Hey guys new to the forums, but been getting lots of good info from here so finally joined. I was wondering if anyone has or knows how to remove and replace the entire gas tank in a 91 LS400. I bought the car for cheap in pretty good shape only few minor issues. One of them being a poor patch job on the top right corner of the tank (if you're looking at it from the trunk) made up of what looks like duct tape and jb weld. It's been holding but its starting to leak and the smell of gas is present in the car. I've found a gas tank from a 1992 lS400 nearby and am hoping to swap the two. I plan on keeping my current fuel pump just swapping tanks. Thanks for the input.
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oldskewel (03-01-20)
02-29-20, 04:20 PM
#2
You need to take out the trunk liner and the rear seat cushion and back. The attachments are for a '98 MY but it should be similar. There's no procedure on how to remove the tank that I could find but it should be pretty obvious once you get to it.
If you're going to go through all the trouble of swapping tanks, I would consider installing a new fuel pump as well.
Edit: attached is the fuel tank component view.
If you're going to go through all the trouble of swapping tanks, I would consider installing a new fuel pump as well.
Edit: attached is the fuel tank component view.
Last edited by paulo57509; 02-29-20 at 04:24 PM.
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BrgndyBoat (03-01-20)
03-01-20, 09:59 AM
#3
Driver School Candidate
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You need to take out the trunk liner and the rear seat cushion and back. The attachments are for a '98 MY but it should be similar. There's no procedure on how to remove the tank that I could find but it should be pretty obvious once you get to it.
If you're going to go through all the trouble of swapping tanks, I would consider installing a new fuel pump as well.
Edit: attached is the fuel tank component view.
If you're going to go through all the trouble of swapping tanks, I would consider installing a new fuel pump as well.
Edit: attached is the fuel tank component view.
03-01-20, 11:36 AM
#4
Good job (planning on) getting it fixed. Usually I love JB Weld and duct tape as much as the next fella, but not so much on a gas tank.
Another thought though, on the presence of gas smell "in the car" ... you might also want to take a careful look at the gasket where the fuel pump attaches.
Another thought though, on the presence of gas smell "in the car" ... you might also want to take a careful look at the gasket where the fuel pump attaches.
03-01-20, 12:14 PM
#5
Driver School Candidate
Thread Starter
Good job (planning on) getting it fixed. Usually I love JB Weld and duct tape as much as the next fella, but not so much on a gas tank.
Another thought though, on the presence of gas smell "in the car" ... you might also want to take a careful look at the gasket where the fuel pump attaches.
Another thought though, on the presence of gas smell "in the car" ... you might also want to take a careful look at the gasket where the fuel pump attaches.
03-01-20, 02:33 PM
#6
When I replaced the fuel pump in my '91, I did not replace the gasket, since it seemed to be in fine shape, and still is as the car approaches its 30 year birthday. For me, that was a safer bet than buying a non-Lexus replacement. Yours may be just fine too. But it would be good to figure out how gas fumes were getting into the car, since I'd think that if the rear part of the tank were leaking, it would not get into the passenger compartment from there. So I'm just suggesting to inspect. Sounds like you're on a good path for a good cost effective repair on this.
03-01-20, 08:29 PM
#7
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