Landcruiser fuel injection relay problem

For a long time now my 1992 Landcruiser has had an intermittent hot
start problem. If the vehicle is at operating temperature and is shut
off it usually won't start for the next approximately 10 minutes.
Very irritating when running errands, etc., but otherwise not much of
a problem. Besides living with it and trying a few things I've have
localized the problem to hot failure of the main fuel injector relay.

When it isn't going to start the "check engine" light doesn't come on
as you turn the key and this fact coupled with the wiring diagram led
me to changing the main EFI relay. Initially all seemed fixed but
then the problem reoccurred. For whatever reason I eventually tried
putting back in the original old EFI relay which was cold and it
immediately started. I now have three of these that I swap as needed.

The problem seems to be overheating of the relay which causes a
temporary failure. They actually get too hot to hold. Everything
else about the vehicle's starting/running seems totally normal and I
have owned it since new. This has been going on (off and on) for 2
years but is quite a bit less of a problem in the winter. I only use
the vehicle intermittently so I've been reluctant to spend the money
to get it checked out thoroughly though it would be nice to have
fixed.

Any thoughts on a possible cause. I have speculated that the relay is
getting too much juice but I really can't figure out how that would be
and everything else be normal. Also the rest of the items in the
relay/fuse box (which is under the hood) don't seem to be overly hot,
just the EFI relay. Thanks in advance for any ideas.

Scott

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