hello all!
new to the forum, hope someone can help - '94 civic with intermittent fuel pump power problem - checked main relay, fuses, ground wires, fuel pump, all ok... any ideas, anyone? - thanks

 

did you check the internals of the main EFI relay (i think it is properly called that).

please give credit to "theredsuit" for the following (especially if it solves your problem):
the following is by "cut, copy, and paste":

Something about this sounds just like the problem I had when I first got my 93civic. What I sugest you do to save A LOT of time: is just pull the main relay(right above your left foot near the fuse box), take the cover off of it and examine the solder points. If you look closely you'll see small rings in the solder when the pins come through. The Relay warms up with all the current running through it and what happens is the pins actually expands/gets longer (thermodynamics: warm objects expand ) and breaks contact with the solder and circut board. So you wait while the car is off/won't start for a small amount of time and then it starts again. The solder points have cooled and made contact again!

This is a know problem with the older model civics. If you go to a dealer they'll sell you the main relay for the CRV(not sure if the new civics use the same one) to replace it with. However it's plug and play so no wire changes. OR you can fix it yourself by heating the solder contacts and wicking the lead away and resoldering the whole thing with new lead. This can be time consuming and may not work if it's another part of the relay that's shot.

So check it out and see if you have some broken contacts, it could save you some time and money.