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Toyota products usually don't use a shut-off for the fuel system. If the fuel pressure is low, you would need to check the fuel pump relay for power and then the pump.
The main purpose on an alternator is to recharge current back to the battery. One of the most common problems with the Lexus LS400 and SC400 is that power steering pump seal leak. Right below the power steering pump is the alternator. The power steering fluid will drip down and cause many electrical problems for the alternator. Therefore, its very common to have the alternator go bad along with the power steering pump, just be sure to check.
The water pump is always easy to find because it is driven by the belts so has to be on the belt side of the engine, and has to have a major radiator hose going to it.
It looks like you just take the serpentine belt off, unbolt the pump, and replace it. Loosen/tighten all the bolts diagonally in at least 2 stages, and use some gasket sealer on the new gasket.
could be the head gasket gone, if you take it to a garage they can do a test on it which will take about 10 minutes, if you are leaking water but not on the floor there is a good chance its going into the exhaust which will cause steam(white smoke) out the exhaust
water pump is behind the fan pulley bracket. need to take off the timming belt to get to the water pump. also need to remove the distributor covers on bothe sides. 2 boolts that hold the a/c compressor to the fan pulley bracket ,alternator,idler pulley.
each corner will have drains, sometimes you can get a long air gun and shoot some air down there and clear the stoppage, but be careful that you dont blow the hose off. sometimes it just may need to be lubricated.
Hi.....
On your 91 Lexus ls 400.
If you remove the Rear passanger seat.
You will have axces to the fuel pump.
Remove the metal cover . Disconnect the wire harnes,
Disconnect the lines.
removing the nuts you will able to remove the fuel pump.
Ok.. I hope this help on your question.
Thank you for use fixya...
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