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[bgdriver]

As it says, car won't start. 6.8 volts b/t the black and yellow/black wire at the connector. Is it the main relay or a wiring problem or something else?

Thanks!

All fuses have been checked.

[BoostForLife]

Just run an 8gauge wire to the pump fromt the wire through a fuse and then have a relay controlling it.
Hopefully your 6.8volts is enough to open a relay for the big ass wire.

[Foowee]

Have you opened up your main relay?  If not you need to look at the solder joints on the board to see if there are any small rings(cracks). 



http://www.marklamond.co.uk/tech-honda/pgm-fi/main-relay/main-relay.htm

btw a main relay can still be bad even if you hear it click...

[stealthiskey]

6.8 volts with the pump unplugged? i.e. no current draw? 

or 6.8 v with the pump plugged in and running?