Poking around and found this, good info and betting is the issue.
http://www.4crawler.com/4x4/CheapTricks/index.shtml#FuelPump
How to test the relay:
http://www.4crawler.com/4x4/CheapTricks/index.shtml#CORelayLocation
http://www.4crawler.com/4x4/CheapTricks/index.shtml#FuelPump
How to test the relay:
http://www.4crawler.com/4x4/CheapTricks/index.shtml#CORelayLocation