You should check the fuel pressure at the rail. if it is not to spec (and the new pump is working (you should be able to hear it)) then check the fuel pressure regulator (if equipped). I am assuming that you have checked the filters, and that there is fuel in the tank) if the pump is running but will not hold pressure with the engine running and the regulator is good then you probably have a bad pump or a restriction in the line.
The fuel pressure should come up to spec and stay there with the engine running, it should bleed off very slowly (if at all) after the vehicle is turned off. If the pressure drops quickly after the engine is shut off then you probably have either a bad regulator or pump.
If the fuel pump is not working then check for voltage at the tank connection and back trace the wires to find the point that the circuit is broken. Note; the pump is normally controlled by a relay that will turn it on for a few seconds after the ignition is turned on then turn it back off if the engine is not started. I am not certain how this is determined by the computer on your vehicle (if the pressure comes up and its starts then the fuel pump is shut down by the computer then it likely that the computer is thinking that the engine is not running.)
If the pump does not run at all...many vehicles have crash sensors that will turn the fuel pump off until they are manually reset (fords are notorious for this ) I don't know if you vehicle is so equipped.
Hope it helps...
...a well prepped, well driven, vehicle should do well in any terrain, including the highway.
Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.
Last edited by Happy Joe; 08-12-2007 at 06:52 PM..