This isn't actually a honda problem, but I hope someone here can give me
some insight into what is happening & why.

I have a 93 Nissan pickup w/ electric fuel pump in gas tank.  When it works,
it works fine..  until you shut engine off.  It doesn't quit when engine is
running -  regardless of how long it runs -  1 mile or 50. but after turning
engine off, fuel pump may or may not run.   If it doesn't, it won't work
again  until it sits a day or so.
Based on the schematic, I thought the problem was with the ECU to the fuel
pump relay, so I pulled the relay & jumped the circuit.  It seemed to work
fine  -  started it several times over next couple of days - even let it run
& get up to operating temp, shut off & restarted fine.

Then drove it about 5 mi.,  and it wouldn't start afterward.  Still wouldn't
start 3 hrs later,  but started & drove it home about 20 hrs later.  Turned
off & wouldn't start.

I guess I need to replace fuel pump, but I'm baffled as to why pump works
fine and continues to run as long as engine is running.  It seems like a bad
pump would quit on the road instead of only when engine is turned off.