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Dirty bad connections on the battery cables. Bad grounds. Bad connection in the fuse box. Sometimes what you are facing is one of the most difficult electrical troubleshooting problems possible. Intermittent loss of a connection.
In extreme cases I have run a test light circuit to the fuel pump power lead. If you have no light when the pump should have power you know it is in the power circuit to the pump. If you have a light but no pump you know it's in the ground circuit.
Once you establish which circuit is failing you can move the test light connection back alone the power circuit until you lose your power. This is if the problem is in the power circuit to the pump.
If it's the ground circuit then you need to use a DVOM to test for a voltage drop along that circuit.
Your bad connection will be where you lose the test light in the power circuit, or where you see a significant drop in voltage in the ground circuit.
Most common problem I have seen in Honda's is the ground wire from the engine to the chassis is either missing or has a bad connection, corrosion at either end. Could also be a bad ground at the fuse block. Use the DVOM (digital volt ohm meter) to check from the battery to the various places, like engine, body dash, steering column, etc.
Also pay close attention to the ignition switch. Not sure about Honda's but Nissan's were notorious for bad electrical parts of the ignition switch. So bad I can almost remember the Nissan part number, even though haven't worked on them in over 10 years.
I think it was a 48750 E7705 for the Z cars.
regards
Mech
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