I would do the fuel regulator test.
While the engine is cold, open the hood and pull the vacuum line from the fuel pressure regulator. Have a friend or family member turn the key to the on position so you can watch to see if any gas blows out the vacuum hose fitting on the fuel regulator. If it does, replace it.

Mike

'94, and '00 Amigos and '00, 01 Rodeos. Rodeo springs and aftermarket 'hard top on 94. Aisin hubs OME 919's on the 2000 Amigo. 2000 and 2001 Rodeos have OME 912's and Aisin. Smoother ride with the OME 919's???